Tag Archives: cooling compressor

China high quality 48V 60V 72V Cooler Cooling System Electric 12V 24V Parking Conditioner Auto Parts Air Compressor air compressor portable

Product Description

Product Description

 

Name Electric compressor
Type Scroll
Freon R134a
Displacement 18~27cc
refrigerant oil POE68 130ml
Weight 5.6kg
Power 12V:550W; 24V:850W
RPM 12V:1800rpm; 24V: 3000rpm

We have many types of air conditioners for your option, including rooftop type, split type, invisible type and so on.

Company Profile

Quality, responsibility and innovation, have always been what CHINAMFG Environment Technology Co., Ltd. Pursues.

With standard workshops over 35, 000 square meters, our factory covers an area of 80 acres, with 235 employees and 23 engineers. Concentrating on air solutions, we manufacture parking air conditioners, parking heaters, scroll and rotary compressors, DC generators and so on.

To ensure quality, we are equipped with a complete set of advanced equipment, including CNC machining, turning and milling compound machining, Mitutoyo three-coordinate measuring instrument, Flip-type impregnation equipment, automatic ultrasonic cleaning machine. Meanwhile advanced automotive electric air conditioning system environment simulation laboratories have been established. All products will go through 100% test according to ISO9001 and CE standards before launching market.

Our research and development team provides customization and after-sales support. New products will be launched every couple of months, showing the best appearance and most reliable function, leading the trend of the industry.

After-sales Service: Tech Support
Warranty: 1 Year
Classification: Variable Capacity
Job Classification: Reciprocating
Transmission Power: Turbine
Cooling Method: Air-cooled
Samples:
US$ 150/Piece
1 Piece(Min.Order)

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Request Sample

Customization:
Available

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air compressor

What are the advantages of using an air compressor in construction?

Using an air compressor in construction offers numerous advantages that contribute to increased efficiency, productivity, and versatility. Here are some key benefits of using air compressors in construction:

  • Powering Pneumatic Tools: Air compressors are commonly used to power a wide range of pneumatic tools on construction sites. Tools such as jackhammers, nail guns, impact wrenches, drills, and sanders can be operated using compressed air. Pneumatic tools are often preferred due to their lightweight, compact design and ability to deliver high torque or impact force.
  • Efficient Operation: Air compressors provide a continuous and reliable source of power for pneumatic tools, allowing for uninterrupted operation without the need for frequent battery changes or recharging. This helps to maintain a smooth workflow and reduces downtime.
  • Portability: Many construction air compressors are designed to be portable, featuring wheels or handles for easy maneuverability on job sites. Portable air compressors can be transported to different areas of the construction site as needed, providing power wherever it is required.
  • Versatility: Air compressors are versatile tools that can be used for various applications in construction. Apart from powering pneumatic tools, they can also be utilized for tasks such as inflating tires, cleaning debris, operating air-operated pumps, and powering air horns.
  • Increased Productivity: The efficient operation and power output of air compressors enable construction workers to complete tasks more quickly and effectively. Pneumatic tools powered by air compressors often offer higher performance and faster operation compared to their electric or manual counterparts.
  • Cost Savings: Air compressors can contribute to cost savings in construction projects. Pneumatic tools powered by air compressors are generally more durable and have longer lifespans compared to electric tools. Additionally, since air compressors use compressed air as their power source, they do not require the purchase or disposal of batteries or fuel, reducing ongoing operational expenses.
  • Reduced Electrocution Risk: Construction sites can be hazardous environments, with the risk of electrocution from electrical tools or equipment. By utilizing air compressors and pneumatic tools, the reliance on electrical power is minimized, reducing the risk of electrocution accidents.

It is important to select the appropriate air compressor for construction applications based on factors such as required air pressure, volume, portability, and durability. Regular maintenance, including proper lubrication and cleaning, is crucial to ensure the optimal performance and longevity of air compressors in construction settings.

In summary, the advantages of using air compressors in construction include powering pneumatic tools, efficient operation, portability, versatility, increased productivity, cost savings, and reduced electrocution risk, making them valuable assets on construction sites.

air compressor

How do you maintain proper air quality in compressed air systems?

Maintaining proper air quality in compressed air systems is essential to ensure the reliability and performance of pneumatic equipment and the safety of downstream processes. Here are some key steps to maintain air quality:

1. Air Filtration:

Install appropriate air filters in the compressed air system to remove contaminants such as dust, dirt, oil, and water. Filters are typically placed at various points in the system, including the compressor intake, aftercoolers, and before point-of-use applications. Regularly inspect and replace filters to ensure their effectiveness.

2. Moisture Control:

Excessive moisture in compressed air can cause corrosion, equipment malfunction, and compromised product quality. Use moisture separators or dryers to remove moisture from the compressed air. Refrigerated dryers, desiccant dryers, or membrane dryers are commonly employed to achieve the desired level of dryness.

3. Oil Removal:

If the compressed air system utilizes oil-lubricated compressors, it is essential to incorporate proper oil removal mechanisms. This can include coalescing filters or adsorption filters to remove oil aerosols and vapors from the air. Oil-free compressors eliminate the need for oil removal.

4. Regular Maintenance:

Perform routine maintenance on the compressed air system, including inspections, cleaning, and servicing of equipment. This helps identify and address any potential issues that may affect air quality, such as leaks, clogged filters, or malfunctioning dryers.

5. Air Receiver Tank Maintenance:

Regularly drain and clean the air receiver tank to remove accumulated contaminants, including water and debris. Proper maintenance of the tank helps prevent contamination from being introduced into the compressed air system.

6. Air Quality Testing:

Periodically test the quality of the compressed air using appropriate instruments and methods. This can include measuring particle concentration, oil content, dew point, and microbial contamination. Air quality testing provides valuable information about the effectiveness of the filtration and drying processes and helps ensure compliance with industry standards.

7. Education and Training:

Educate personnel working with compressed air systems about the importance of air quality and the proper procedures for maintaining it. Provide training on the use and maintenance of filtration and drying equipment, as well as awareness of potential contaminants and their impact on downstream processes.

8. Documentation and Record-Keeping:

Maintain accurate records of maintenance activities, including filter replacements, drying system performance, and air quality test results. Documentation helps track the system’s performance over time and provides a reference for troubleshooting or compliance purposes.

By implementing these practices, compressed air systems can maintain proper air quality, minimize equipment damage, and ensure the integrity of processes that rely on compressed air.

air compressor

What is the impact of tank size on air compressor performance?

The tank size of an air compressor plays a significant role in its performance and functionality. Here are the key impacts of tank size:

1. Air Storage Capacity: The primary function of the air compressor tank is to store compressed air. A larger tank size allows for greater air storage capacity. This means the compressor can build up a reserve of compressed air, which can be useful for applications that require intermittent or fluctuating air demand. Having a larger tank ensures a steady supply of compressed air during peak usage periods.

2. Run Time: The tank size affects the run time of the air compressor. A larger tank can provide longer continuous operation before the compressor motor needs to restart. This is because the compressed air in the tank can be used to meet the demand without the need for the compressor to run continuously. It reduces the frequency of motor cycling, which can improve energy efficiency and prolong the motor’s lifespan.

3. Pressure Stability: A larger tank helps maintain stable pressure during usage. When the compressor is running, it fills the tank until it reaches a specified pressure level, known as the cut-out pressure. As the air is consumed from the tank, the pressure drops to a certain level, known as the cut-in pressure, at which point the compressor restarts to refill the tank. A larger tank size results in a slower pressure drop during usage, ensuring more consistent and stable pressure for the connected tools or equipment.

4. Duty Cycle: The duty cycle refers to the amount of time an air compressor can operate within a given time period. A larger tank size can increase the duty cycle of the compressor. The compressor can run for longer periods before reaching its duty cycle limit, reducing the risk of overheating and improving overall performance.

5. Tool Compatibility: The tank size can also impact the compatibility with certain tools or equipment. Some tools, such as high-demand pneumatic tools or spray guns, require a continuous and adequate supply of compressed air. A larger tank size ensures that the compressor can meet the air demands of such tools without causing pressure drops or affecting performance.

It is important to note that while a larger tank size offers advantages in terms of air storage and performance, it also results in a larger and heavier compressor unit. Consider the intended application, available space, and portability requirements when selecting an air compressor with the appropriate tank size.

Ultimately, the optimal tank size for an air compressor depends on the specific needs of the user and the intended application. Assess the air requirements, duty cycle, and desired performance to determine the most suitable tank size for your air compressor.

China high quality 48V 60V 72V Cooler Cooling System Electric 12V 24V Parking Conditioner Auto Parts Air Compressor   air compressor portableChina high quality 48V 60V 72V Cooler Cooling System Electric 12V 24V Parking Conditioner Auto Parts Air Compressor   air compressor portable
editor by CX 2023-10-07

China Hot selling 15kw 20HP Electric Water Cooling Air Compressor Machine with Hot selling

Product Description

15KW 20HP Electric Water Cooling Air Compressor Machine

Working Pressure: 7 – 12bar (100 – 181psi) 
Air Delivery: 1.8 – 2.6m3/min 
Type of Driving: Belt Driven 
Type of Cooling: Air Cooling
Dimension: 1050*750*1050mm 
Weight: 500kg 
Output pipe Diameter: G3/4″

Product Details

1. Genunie Air End
 Advacnced air end with larger air delivery and stable running conditions.
2. High Efficiency Motor
 High efficiency motor with protection class IP54.
3. Shock Absorbers
 Motor-grounded shock absorbers: Reduce the amplitude, therevy reducing the equipment damage caused by the resonance.

Our Factory

Windbell Co. Ltd. was established in 2006. It is a high-tech company mainly producing Air Compressor

Located in HangZhou National High and New Technology Industries Development Zone, the company has more than 100 employees equipped with 50 advanced testing machines working in the plant area of 20000 square meter. A high profile R&D team with experience in developing products with GHH and Rotor, has more than 20 patents granted. The company can produce more than 4000 Air Compressor every year.

We believe that without an advanced quality management system you cannot make high quality products. With ISO9001 and ISO14001 certifications, the company aims to be a CZPT in offering consumers efficient, energy-saving, and environment-friendly solutions in the application of air compressor. Based on its R&D output, the company has successfully applied its solutions to the field of mining, tunneling, outdoor construction and its technology also facilitates the production of medical oxygen generators and textile equipment. The Air Compressor are widely sold to Southeast Asia, Central Asia, Middle East, Africa, and South America…

Lubrication Style: Lubricated
Cooling System: Air Cooling
Power Source: AC Power
Installation Type: Stationary Type
Type: Twin-Screw Compressor
Transport Package: Standard Wooden Box
Customization:
Available

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air-compressor

What to Look For When Buying an Air Compressor

An air compressor is a very useful tool that can help you complete many different types of construction jobs. This handy machine makes many tasks much easier, but not all of them are created equally. Understanding what to look for when buying an air compressor will help you make an informed decision. Here are some of the things you should look for. These include price, size, and energy efficiency. Also, make sure to consider the air compressor’s type.

Single-stage air compressors are quieter

When it comes to noise level, single-stage air compressors are the way to go. These machines have fewer moving parts and are quieter than two-stage models. Single-stage air compressors use an axial flow design and can be quieter than their dual-stage counterparts. Single-stage air compressors can run longer and at lower pressures. Single-stage air compressors can be used for light industrial applications. They have a long life expectancy, with some models lasting for over three thousand hours.
While some single-stage air compressors are quieter than two-stage air compressors, both models have noise-reduction features. One type features rubber parts, which are designed to dampen noise. Another feature makes a compressor quieter: its location near the job site. Some models feature rubber base plugs and rubber mats to reduce floor vibrations. In addition to using these features, single-stage compressors are easier to transport.
Noise levels are important when choosing an air compressor. Some machines are too noisy for comfortable work, and some businesses don’t want to expose customers to noise-generating air compressors. Other noise levels can even endanger workers’ health. Single-stage air compressors are more affordable than dual-stage compressors. They are also quieter and more powerful. But be prepared for the noise. Some single-stage air compressors are still noisy.
Compared to their two-stage counterparts, single-stage compressors are quieter when running at full capacity. However, double-stage compressors are quieter on low capacities than single-stage units. Those with variable speed are quietest at lower capacities. The difference is about 10db. If you’re concerned about the noise level, you should consider a two-stage air compressor. But if you have a small workshop, it may not be suitable for you.
One-stage air compressors are generally more efficient than two-stage air compressors. The noise from a two-stage air compressor is lower because there’s no intermediate stage. Single-stage air compressors also use a piston that rotates in a single stage, while dual-stage air compressors, also known as duplex models, are more efficient. A single-stage air compressor is quieter, but double-stage compressors are louder.
air-compressor

Two-stage air compressors are more energy efficient

Two-stage air compressors are more energy-efficient than single-stage machines. The efficiency of two-stage air compressors is increased through a combination of improved efficiency and increased longevity. These machines can store more air and have higher compression ratios. One model of a two-stage compressor can hold approximately 83 cubic feet of air at 100 PSI and 120 cubic feet at 150 PSI. A two-stage compressor is also quieter.
Two-stage air compressors are more energy-efficient because they have two pistons instead of one. These air compressors achieve a higher pressure rating and recover more quickly. This type of compressor is perfect for jobs that require high air pressure for a prolonged period of time. In addition, they can operate multiple tools simultaneously. This makes them better for commercial and industrial use. Listed below are some benefits of two-stage air compressors.
Single-stage air compressors can power tools in the garage or kitchen, but they are not as reliable for industrial applications. Single-stage compressors have larger parts that tend to experience condensation. Furthermore, single-stage compressors do not last long in continuous use and are less energy-efficient than two-stage ones. Whether you’re using the compressor for a single tradesperson, a small crew, or a large construction crew, two-stage compressors are the best choice.
Single-stage air compressors are often used in small-scale food preparation and production. Single-stage air compressors are easy to transport between locations, and can be plugged into several electrical outlets. Single-stage compressors are also ideal for high-volume food processing. A dual-stage air compressor is ideal for industrial use. In some cases, you can even move the single-stage air compressor between two-stage air compressors.
Single-stage compressors often cycle too quickly, drawing more electricity than two-stage units. A variable speed unit stays on a low speed for hours at a time. Single-stage air conditioners force you to lower your thermostat settings while single-stage air conditioners run too often. Both units are energy-efficient but they are not as energy-efficient as variable-speed compressors. The main difference is that single-stage air conditioners tend to drain the power source quicker.

Piston-driven air compressors are quieter

A piston-driven air compressor is one of the quietest types of air compressors. It is less noisy than reciprocating air compressors. A piston-driven air compressor can reach 62 decibels, while a scroll compressor is around half that volume. The two main components of a scroll air compressor are the piston and the helical screw. These air compressors are both very efficient and quiet.
Older compressors are incredibly noisy. They produce a “wumpa” noise similar to a large engine. They are also capable of producing a high-pitched whine. These noises can be deafening, especially in a small workshop. That’s why it’s essential to look for a quiet compressor. But what makes a compressor quiet? Read on to learn more about this essential tool.
Another difference between piston-driven air compressors and electric-driven air compressors is the power source. Electric air compressors produce less noise than gas-powered compressors, which use an engine. Piston-driven air compressors are also more efficient. They also generate less heat, making them an ideal choice for offices and other settings where noise is a problem. The best way to decide between the two types of air compressors is to check the manufacturer’s warranty and read the ‘Description’.
Noise reduction is the first priority of a compressor’s owner, so make sure that you have the right model. If you’re working on something sensitive, don’t place the compressor too close to a building where people might be nearby. Noise can be very disruptive to the workspace and can cause health problems. To help combat noise, you’ll need to buy a quiet air compressor. And don’t forget to consider its location: Piston-driven air compressors are quieter than their reciprocating counterparts.
Piston-driven air compressors are quiet because the piston is made of thin metal and more rubber, which absorbs the sound. Unlike reciprocating air compressors, piston-driven air compressors are more efficient than their dual-piston cousins, which are quieter and more powerful. So which type is right for you? Take a look at some of the main differences between the two. If you want a quiet compressor, make sure it meets the specifications required by the job you’re working on.
air-compressor

Oil-lubricated air compressors are more cost-effective

There are several reasons why oil-lubricated air compressors are more expensive than dry-type air compressors. First of all, oil-lubricated air compressors tend to be more reliable and quiet. Additionally, oil-lubricated air compressors require fewer parts and can last longer than dry-type air compressors. These are just a few of the many benefits of using oil-lubricated air compressors.
Oil-free air compressors have some disadvantages. They are less durable and may not be as efficient as oil-lubricated models. Additionally, because oil-lubricated air compressors use oil, they can get very noisy. While they are less expensive, they are not the best option for heavy-duty work. However, modern oil-free air compressors have soundproofing and are suitable for industrial use.
When purchasing an oil-lubricated air compressor, make sure to choose one with a tank capacity that meets your needs and your space. Larger tanks can be more expensive than small tanks, but larger units are easier to move around. Also, be sure to consider the weight and size of the portable air compressors when making your choice. If the weight is too large, you may have trouble carrying it from place to place.
Another benefit of using oil-lubricated air compressors is their reduced need for oil. These models can last up to a decade longer than oil-free counterparts. Oil-free air compressors are more affordable and can achieve the same high performance as their oil-lubricated counterparts. Many industrial applications benefit from these air compressors. So, which one is right for you? We’ve listed a few of them below.
Another benefit of choosing an oil-lubricated air compressor is the reduced cost of maintenance. This type is more durable than its oil-lubricated counterparts, which require regular oil changes to keep them running smoothly. However, it is not feasible to transport an oil-lubricated compressor, which means that you must install it permanently to keep it working efficiently. In addition, these air compressors are difficult to move and are not portable, which can limit your ability to use it in a pinch.

China Hot selling 15kw 20HP Electric Water Cooling Air Compressor Machine   with Hot sellingChina Hot selling 15kw 20HP Electric Water Cooling Air Compressor Machine   with Hot selling
editor by CX 2023-06-08

China Factory Price Senior Portable Reusable Industrial Air Cooling Air Compressor with Good quality

Solution Description

Product Description

Detailed Photographs

Our Manufacturing unit

Software

Firm Profile

HangZhou CZPT Auto Engineering CO.,LTD. was started in 1996, which is
located in HangZhou city. It specializes in vehicle entire body repair method, automobile elevate and tire gear with
technological innovation improvement, product growth, manufacturing, product sales and services.

 

Our company has passed the ISO9001, and our items has acquired CE accredited, now we have
some national patents, which show that we have a professional R&D Team. Our automobile entire body repair
method has been widely exported all over the entire world and are extensively utilised in numerous domestic and
foreign restore shops and 4S automobile upkeep stations. We has participated in domestic
specialist equipment exhibitions and world-wide physique repairs in Las Vegas for several years. The
Equipment Exhibition (NACE) has received unanimous praise and has turn into a planet-renowned
expert gear producer.

 

Welcome you decide on “JINTUO” model, We will offer you with our coronary heart.

FAQ

Q: How do you manage your creation good quality?
A: We have an impartial QC crew. Our QC groups do sample inspection, component inspection
throughout creation and a hundred% last inspection prior to shipping and delivery.

Q: Can I have a visit to your firm before placing an order?
A: Sure, welcome to check out CZPT Vehicle TECH. There is a showroom in our manufacturing unit, you can get
all what you want about the automobile equipment.

Q: Could I know the Direct time?
A:The lead time of our machine is 7 to twenty times.

Q: What is your payment phrases?
We acknowledge Alibaba Trade Assurance, TT, LC, and many others.

Q: Can you supply the entire workshop automotive products?
A: Of course. we have 8 series of merchandise is made up of virtually all kinds of automotive gear. Also we have
helped a lot of consumers to open up their human body store.

Q: How prolonged is the warranty?
A: Our warranty period is 18 months,we will ship totally free parts for substitution inside it, and provide spare
parts for lifetime.

Q: Are you a manufacturing facility?
A: CZPT has invested a manufacturing unit with an region of twelve,000 square meters, specializing in the manufacturing of
different body equipment, automobile elevate,wheel alignment,auto clean machine and so forth.

After-sales Service: Technical Support
Warranty: 18 Months
Lubrication Style: Lubricated
Cooling System: Air Cooling
Cylinder Arrangement: Balanced Opposed Arrangement
Structure Type: Open Type

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Samples:
US$ 599/Piece
1 Piece(Min.Order)

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Request Sample

###

Customization:
After-sales Service: Technical Support
Warranty: 18 Months
Lubrication Style: Lubricated
Cooling System: Air Cooling
Cylinder Arrangement: Balanced Opposed Arrangement
Structure Type: Open Type

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Samples:
US$ 599/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:

Choosing an Air Compressor

Considering a new Air Compressor? Here are some tips to make the decision easier. Learn the pros and cons of each type, including the differences between oil-injected and oil-free models, single stage and positive displacement. In addition, learn more about the different technologies that are available for your air compressor. It is important to choose an appropriate unit for the type of work you do. Here are some of the best compressors available today.
air-compressor

Positive displacement

There are several different types of air compressors, but most are positive displacement air compressors. They use a rotary or reciprocating component to compress air. The reciprocating component compresses air by reducing the volume of the chamber. Positive displacement compressors are used in bicycle pumps, chemical plants, and refrigerators. Positive displacement air compressors use multiple inlet ports. Despite the various types, the principle of operation remains the same.
Another type of positive displacement air compressor is a reciprocating piston. The piston inside a cylinder moves up and down, causing the compressed air to fill the upper part of the cylinder. These air compressors are used in a variety of different applications, including blowing bottles and gas pipelines. These air compressors can be water-cooled, lubricated, or non-lubricated. Different types have different capacities and air pressures.
A positive displacement flowmeter uses a rotating chamber that divides continuous fluid into discrete portions. The number of times the chamber is filled and discharged can be used to estimate the flow rate. The rotation speed of the measuring chamber is directly proportional to the flow rate. The drawbacks of this type of positive displacement flowmeter are that it is prone to jamming. If the fluid contains particles, it may be too thick for the meter to determine flow rate.
A negative displacement air compressor was invented in 1860 and is the oldest type of compressor. It uses two lobes positioned in a circular cavity. One rotor is connected to an engine, while the other pushes the other one to spin in the opposite direction. Negative displacement compressors are low-maintenance, but they do require more precision. They are often used in nuclear power plants because they use the kinetic energy of the rotating elements to produce pressure.

Oil-injected

Oil-flooded or oil-injected air compressors use liquid to seal and lubricate moving parts and reduce noise. Oil-flooded air compressors are effective for a variety of pneumatic tools and accessories. Some models have a thermostat that controls the amount of oil used during operation. Other types of oil-flooded air compressors are piston-type models. Here is an overview of the basic differences between these two air compressors.
An oil-injected air compressor is more expensive than a comparable oil-free air compressor, but its advantages far outweigh its disadvantages. An oil-free compressor is quieter, requires less maintenance, and has a lower price tag. It also offers a greater degree of air purity. A number of other advantages may also make this type of air compressor the better choice for many industrial settings. If you need a high-pressure compressor in a tight space, consider the benefits of an oil-free system.
Oil-injected air compressors require more maintenance than oil-free models. Both types of air compressors offer similar capacity and ISO 8573-1 Class 0 and 1-2 purity, but the oil-injected systems require more air-treatment components. They require an activated carbon filter and coalescing filter. Oil-injected air compressors will likely remain the standard for industrial air compressors for many years. And since their performance and efficiency are comparable, it may be worthwhile to invest in some point-of-use air treatment.
Both types of air compressors have their benefits. However, choosing between oil-free and oil-injected air compressors is not as straightforward as you might think. Whichever type you choose, make sure it will meet your needs. The benefits of an oil-injected air compressor outweigh their disadvantages. In general, oil-injected air compressors are more durable and can last longer than oil-free models. The only downside is their higher price.
air-compressor

Oil-free

When choosing an air compressor for your company, you’ll need to determine what it is going to be used for. For example, if you’re planning on using it to power multiple workers, you should consider getting an oil-free compressor. An oil-free compressor, on the other hand, is quieter and can power several workers at a time. If you’re a contractor, the most important consideration will be the type of jobs you’ll be doing. Higher air pressure means greater demand for air flow, and more pressure can damage the equipment.
Oil-free compressed air is certified 100% free of contaminants. Technically, oil-free air is not completely free of foreign matter, but it is extremely low within the limits of practical air quality. A technically oil-free air compressor might have a total oil level of 0.003 mg/m3. If you’re in need of a technically oil-free air compressor, you must install an air treatment equipment after your current compressor.
If you’re in the manufacturing industry, a good oil-free air compressor will save you money and reduce your environmental impact. Many of these tools require air compressors to work, and this equipment will ensure that they don’t get contaminated. To buy the best oil-free compressor, you should learn a bit about the different terms used by compressor repair companies. ACFM, for example, is the amount of air that can be compressed in one minute at rated conditions.
When you’re using an oil-free air compressor, you should know that the overall life of the device will be much shorter. Compared to an oil-flooded rotary screw air compressor, an oil-free compressor typically has a lifespan of 50 thousand hours. But it’s important to understand that this type of compressor can still cause damage to piping and processes. Therefore, you should choose an oil-free compressor when you need to clean air for your business.

Single-stage

A single-stage air compressor, also known as a piston air compressor, compresses air only once before storing it in a cylinder. This stored air has enough energy to power a variety of pneumatic tools, such as screwdrivers, chisels, and wrenches. These units are also ideally suited for low-flow applications and are widely used in gas stations, auto shops, and various manufacturing plants.
A single-stage air compressor uses two valves – one for inlet and one for outlet – to transfer compressed air. Both valves are actuated by springs. The inlet valve has a slight curvature to provide protection from damage. The compressor’s outlet valve opens when the pressure in the cylinder is higher than the pressure in the storage tank. The piston moves very quickly inside the cylinder, exerting a high amount of force throughout the compression process. This high piston speed is a common cause of compressor wear and tear.
A single-stage air compressor is ideal for smaller tradesmen and small construction crews. Its lightweight and compact design make it easier to transport and store. While it may be tempting to buy the first cheap air compressor you see, it’s important to balance the price against performance to choose the right air compressor for your needs. The best single-stage air compressor is one that provides excellent performance and durability. Its two-stage counterpart is designed for larger construction teams and large applications.
The main difference between a single-stage and a two-stage air compressor lies in their capacity. A single-stage air compressor compresses air only once and delivers it into the storage tank, while a two-stage compressor compresses it twice, creating double the pressure. Because of this, single-stage air compressors are cheaper and versatile than their counterparts, which means that they can be used for multiple purposes.
air-compressor

Low-noise

A low-noise air compressor is a type of industrial compressor that is less noisy than regular air compressors. These are generally smaller machines designed for smaller factories and workshops with a few to several employees. They are designed to handle mid-weight volumes of compressed air per day. This type of compressor is especially useful for smaller manufacturing businesses that need to produce compressed air for medical applications. Small breweries can also benefit from the low-noise capabilities of these compressors.
Low-noise air compressors come in various sizes and features. For smaller jobs, you can purchase a one-gallon model that is lightweight and portable. For larger jobs, you can purchase one with a larger tank that can provide more pressure for longer jobs. However, a larger tank will make the compressor heavier and harder to transport. To avoid this, make sure to check the size of the tank and how much power it can handle.
Considering a low-noise air compressor for your business? If so, you’ve come to the right place. There are a variety of affordable and dependable low-noise options to choose from. A CAT 10020C, for example, is designed to provide high-volume air to many outlets at once. A CAT 10020C comes with a 10-gallon tank, wheels, and a carrying handle.
Noise levels can also affect the productivity of employees. When employees work with air compressors in close proximity to each other, they may develop tinnitus. If employees are free from tinnitus because of the loud noise, they are likely to work more efficiently. Moreover, it will be easier for them to focus and communicate efficiently. If you need a compressor, a low-noise one is an excellent choice.

China Factory Price Senior Portable Reusable Industrial Air Cooling Air Compressor     with Good qualityChina Factory Price Senior Portable Reusable Industrial Air Cooling Air Compressor     with Good quality
editor by czh 2023-01-30

China Environmental and Air Cooling Energy Saving Oil Air Compressor mini air compressor

Product Description

Solution Description

In depth Images

Our Manufacturing unit

Software

Firm Profile

HangZhou CZPT Auto Technological innovation CO.,LTD. was established in 1996, which is
found in HangZhou metropolis. It specializes in automobile body repair technique, vehicle carry and tire tools with
technologies improvement, item growth, production, sales and provider.

 

Our firm has handed the ISO9001, and our items has acquired CE accepted, now we have
some countrywide patents, which present that we have a skilled R&D Staff. Our automobile body mend
technique has been widely exported all over the entire world and are widely utilised in various domestic and
foreign fix stores and 4S automobile upkeep stations. We has participated in domestic
professional products exhibitions and international physique repairs in Las Vegas for numerous many years. The
Gear Exhibition (NACE) has won unanimous praise and has become a world-renowned
expert equipment manufacturer.

 

Welcome you select “JINTUO” manufacturer, We will offer you with our coronary heart.

FAQ

Q: How do you control your creation good quality?
A: We have an unbiased QC crew. Our QC groups do sample inspection, portion inspection
throughout production and one hundred% closing inspection prior to shipping and delivery.

Q: Can I have a pay a visit to to your organization prior to placing an purchase?
A: Sure, welcome to visit CZPT Vehicle TECH. There is a showroom in our manufacturing unit, you can get
all what you want about the vehicle products.

Q: Might I know the Lead time?
A:The lead time of our equipment is 7 to 20 days.

Q: What is your payment conditions?
We acknowledge Alibaba Trade Assurance, TT, LC, etc.

Q: Can you supply the entire workshop automotive gear?
A: Yes. we have 8 sequence of merchandise includes practically all varieties of automotive tools. Also we have
served numerous consumers to open their human body shop.

Q: How extended is the warranty?
A: Our warranty period is 18 months,we will ship free elements for alternative inside it, and supply spare
parts for life span.

Q: Are you a factory?
A: CZPT has invested a factory with an area of 12,000 square meters, specializing in the generation of
various body equipment, car raise,wheel alignment,car clean machine and so on.

After-sales Service: Technical Support
Warranty: 18 Months
Lubrication Style: Lubricated
Cooling System: Air Cooling
Cylinder Arrangement: Balanced Opposed Arrangement
Structure Type: Open Type

###

Samples:
US$ 599/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:
After-sales Service: Technical Support
Warranty: 18 Months
Lubrication Style: Lubricated
Cooling System: Air Cooling
Cylinder Arrangement: Balanced Opposed Arrangement
Structure Type: Open Type

###

Samples:
US$ 599/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:

A Buyer’s Guide to Air Compressor Types

There are many types of Air Compressors, and it’s important to understand what each type has to offer. In this article, we’ll discuss single stage air compressors, low-noise compressors, and models with two pistons. But, before you buy an Air Compressor, be sure to read our buyer’s guide to the various types. This way, you’ll have all of the information you need to make the right decision for your business.
air-compressor

Single-stage air compressors

A single-stage air compressor is an excellent choice for most general-purpose purposes. They provide enough power to operate pneumatic tools, and they produce less heat. Single-stage air compressors, however, are not suitable for heavy-duty industrial uses. However, they can be used in various applications, including auto shops, gas stations, and various manufacturing facilities. They are also suitable for borewells and other high-pressure places.
These air compressors are a great choice for home use and are suitable for small-scale businesses, contractors, and small shops. These compressors have continuous duty cycles, cast iron compressor pumps, and a minimum 5,000-hour pump life. They also feature advanced features, including ODP motors, Auto Start & Controls, Receiver tanks, and power cords. They have low maintenance and can save you a great deal of money.
Single-stage air compressors are generally less expensive and lighter than their two-stage counterparts. Single-stage air compressors are also more portable, which is a plus for small projects. While two-stage compressors offer higher CFM, they are more powerful and bulky, making them unsuitable for small or home use. So it is essential to determine what you will use the air compressor for and decide on a model based on your needs.
A single-stage air compressor is made of a piston and a tank. The piston moves rapidly inside the cylinder and exerts pressure on the cylinder. This means that the piston can’t move any faster than the air pressure outside the cylinder. The piston is designed to operate in the same way for each stage. This is a great choice for home shops and one-man automotive shops, as it allows you to control the pressure without sacrificing the pump’s life.
Single-stage air compressors are often cheaper than two-stage versions, but they are not the best choice for every application. If you are only using your air compressor occasionally, you’ll find a one-stage model to be much more reliable than a two-stage model. The main difference between the two types of compressors is in the amount of air that each stage compresses. A two-stage air compressor will have more air storage capacity, but it will still produce more pressure.

Rotary vane compressors

Rotary vane compressors use a centrifugal pump to compress air. The rotor is set eccentrically in the housing, which almost touches the vane. As the rotor turns, the air that enters the pump is trapped between the vanes. This compressed air undergoes compression as the rotor rotates. Vanes are small pieces of carbon fiber or graphite composite. Vanes may be made of different materials depending on the application.
While rotary vane pumps are not commonly used to produce compressed air, they are widely used in automotive and hydraulic applications. Chances are, you have used a rotary vane pump at some point in your life. These pumps are also common in the vacuum and compressed air industries. As a result, many people don’t realize that they’re still around. They feature slots that allow the vanes to slide in and out of the rotor.
A rotary vane compressor has a drum and rotor inside. The rotor is eccentrically positioned and has slots and grooves on its surface. Its inlet and outlet ports are situated off-center, allowing the vanes to be pushed out by centrifugal force. Because the rotor rotates so quickly, air is trapped between the vanes. This air then becomes pressurized by the rotating rotor.
Rotating vane compressors can be easily serviced and repaired. A simple replacement of carbon vanes requires just 15 minutes and common tools. The carbon vanes typically last nine to eighteen months, depending on system operating pressure. Before purchasing a rotary vane compressor, make sure to check whether it has been properly performance-tested and has a warranty. Generally, warranties cover the rotor/stator chambers but do not cover the vanes or air filters. You should also check if the unit is covered by a lightning or water damage warranty.
Rotary vane compressors are an integral part of manufacturing industries. Many pharmaceutical manufacturing facilities depend on rotary vane compressors to control their equipment. Other industries that use rotary vane compressors include the plastics, woodworking, natural gas, and medical & dental fields. Their benefits are numerous and far outweigh any disadvantages of rotary screw compressors. For example, a rotary vane compressor can double the life of a conventional compressor.
air-compressor

Rotary vane compressors with low-noise models

If you are looking for a rotary vane air compressor, you have come to the right place. CZPT’s LV Series rotary vane compressors offer low-noise models, compact size, and robust integration. In addition to their low-noise features, they feature large filter systems to deliver high-quality compressed air. The LV Series models also feature CZPT’s reputation for reliability and quality.
This type of compressor uses centrifugal force to operate and is limited in its top and minimum operating speeds. They are only a third as powerful as screw compressors, and their top speed limits are much lower. Furthermore, the vanes wear out easily at high speeds because there is not enough centrifugal force to seal them against the cylinder’s edges. Even at half their full capacity, they consume as much as 80% of their total energy rating.
Because piston compressors produce a lot of noise, factory owners and shop owners have begun to install noise-dampening cabinets and other solutions. But, rotary vane compressors produce far less noise than a traditional vacuum, and the maintenance costs are also low. Rotary vane compressors are also extremely helpful in several industries. They are used in the automotive and auto finishing industries, as well as in dairy industries and milking machines.
If you have a deep pond, a rotary vane air compressor kit can pump up to 20 feet of water. This is more than enough airflow for two to five diffusers. A 1/4 HP rotary vane kit pumps around 4.2 CFM. It also helps to increase circulation and oxygen levels in the pond. Finally, a 1/4 HP kit offers the necessary power to clean up the bottom of a pond.
The rotary vane and rotary screw are the most popular air compressors today. While they are similar in many ways, they are more versatile and durable than their counterparts. They use fewer angular contact ball bearings and require less frequent maintenance than piston air compressors. Compared to piston air compressors, rotary vane and rotary screw compressors are quieter and are less expensive.
air-compressor

Rotary vane compressors with two pistons

The rotary vane and rotary screw compressors are similar in application, but both have different advantages and disadvantages. This article will compare the benefits of each and highlight the differences between them. While both are commonly used in industrial applications, rotary vane compressors are preferred by many industries. These compressors also have a wide range of uses, ranging from automotive air tool operation to milking machines. These compressors also have the advantage of being quieter than piston-powered ones.
The current common rail position may not be suitable for pressure swirl injectors, but new positions have been tested and show improvements in specific energy values. Moreover, the current position is not required for external oil pumps. However, mass induction and expulsion have to be performed with utmost care. This article focuses on the design and efficiency of rotary vane compressors. You can find more information about this new design in the references mentioned below.
The advantages of this type of compressor are its low cost, compact size, and easy maintenance. Hence, they are preferred in low capacity applications. Moreover, they feature integrated vanes. The rotating vanes close the air gap and compress air towards the outlet. Compared to piston-powered compressors, these units are cheaper and more reliable. Therefore, you should choose one with the lowest price tag. You can also opt for rotary vane compressors that are oil-free.
Sliding vane compressors are another popular variant. They have a single cylinder connected to the compressor and are capable of operating at low speeds. This design also reduces the amount of friction and maintains volumetric efficiency. However, the sliding vane compressors suffer from high frictional losses. If you are looking for a more efficient rotary compressor, this is the best option. While sliding vane compressors have been in the spotlight for over a century, they are still quite young.
These compressors are easy to install and maintain. They are also quieter than piston compressors. They are also cheaper than piston-driven compressors. The energy efficiency and low price make them the perfect choice for any commercial or industrial application. If you’re looking for a small, compact compressor, the rotary vane has been proven to be the best choice for your needs. You should know that it has a long service life.

China Environmental and Air Cooling Energy Saving Oil Air Compressor     mini air compressorChina Environmental and Air Cooling Energy Saving Oil Air Compressor     mini air compressor
editor by czh 2022-12-19

China Hot selling Screw Air Stationary Oil Lubricated Water Cooling Compressor (KF250-13) with Hot selling

Merchandise Description

ADEKOM screw air compressors comply with China CZPT Label Course 2 common, according to Chinese regulations and regulations this allows our buyers to lessen income tax by ten% of investment value. 

9 Motives to choosing CZPT air compressor. 

one.The enlarged higher efficiency air-cooled aftercooler is exclusively created for Asia CZPT weather. This guarantees excellent running temperature beneath higher ambient temperature, higher humidity environment but sustaining ample air capacity and operating pressure. 

2.Massive capacity designs undertake double cooling supporter design and style. The 1st cooling enthusiast begins up with the compressor and the next 1 begins up only when the functioning temperature exceeds 80°C and it stops when again underneath 70°C in buy to help save power. 

3.Highly effective, entirely enclosed fan-cooled (T. E. F. C.), IP55, course F electrical motor with S. F. 1.fifteen and S1 responsibility is equipped with high top quality higher velocity bearings from “SKF” with design and style provider daily life of one hundred,000 managing several hours to CZPT round-the-clock procedure with no failure. 

four.The most recent European patented multi-stage air/oil separation program to ensure reduced residual oil content material of less than 1-3 ppm. This exceeds any international common of oil injected rotary screw air compressor and is especially suited for clients with clear air for purposes. 

5.Electronic components of IP54 computerized control panel this sort of as relays, contactors, period protection relays and overload relays are from named brand name Siemens to offer protected and reputable compressor handle resolution. 

6.Double high temperature defense layout alerts the user when the air/oil temperature exceeds 100°C and excursions the compressor when the operating temperature reaches 105°C. Two temperature transducers function independently to greater safeguard the airend from over-temperature. 

7.Nearly all oil and air pipes in CZPT screw compressors are created from good quality metal tube with precision hydraulic screw connections to keep away from oil or air leakage. 

eight.Minimal to medium potential design with its motor baseplate fitted with automobile-10sioning program that routinely adjusts the stress of the transmission belts huge potential model with its motor related immediately with airend by way of flexible coupling. This guarantees substantial energy transmission efficiency and routine maintenance-free procedure. 

9.The inner parts consisting of compressor air stop, primary electric powered motor, air/oil separator vessel and supporter/cooler block are arranged perfectly to aid easy and time conserving routine routine maintenance with immediate and straightforward access to all parts. 
 

KA – KD Sequence (Tiny to Medium Capacity Versions)

KD – KG Collection (Big Capacity Models)

(1)Unit efficiency calculated according to ISO 1217, Ed. 3, Annex C-1996.
(2)Sounds level measured in accordance to Pneurop / Cagi PN8NTC 2.2 test code tolerance ± 3dB(A)
(3)Info inside of brackets is for water-cooled models.

Be aware: CZPT reserves the correct to make alterations without prior observe. For more info, remember to cantact the maker or your regional income agent.

ADEKOM (ASIA PACIFIC) Restricted founded in the late 90’s is a specialized air/gasoline compressors and remedy system maker with headquarter in Hong Kong. Its companions positioned in Vicenza, CZPT and Germering, Germany are the world’s foremost makers with world-wide recognition and encounter in designing, manufacturing and marketing of rotary screw air/gas compressors for many years. High quality, Reliability and CZPT Performance have been the principal targets of serving customers all in excess of the globe. CZPT follows the company core of its European associates, is fully commited to the research & development, quality assurance and fulfillment of customers’ demands. Right now, what CZPT can do is not just to provide the ideal items to the industry, but to provide THE Overall Solution TO YOUR Demands!

Contact US

Asia CZPT Marketplace: Spencer Lau (Ms.)
 
European/ Center Jap/ African Industry: Echo Lok (Ms.)

American Industry: Alice Kwok (Ms.)
 

Sorts of Air Compressors

There are several sorts of Air Compressors offered on the marketplace. Discover which one particular is correct for your wants and what tends to make one particular far better than one more. Discover out far more about Single-stage types, Oil-totally free versions, and Lower-sounds designs. This report will describe these varieties and aid you determine which a single you need to have. You can also understand about Air Compressors that have one-phase compressors. If you are hunting for a high-quality compressor, this post will assist you choose a device.
air-compressor

Air Compressors

Air compressors perform by forcing atmospheric air by way of an inlet valve. As the piston moves down, it pulls atmospheric air into the chamber. As the piston rises, it forces the compressed air out of the cylinder via an exhaust valve. One of the most frequent varieties of air compressor is the reciprocating variety. Another variety of compressor is a one-phase piston. These kinds of compressors compress air in a single stroke – equal to the full rotation of the piston’s crankshaft.
These products adjust electrical or mechanical strength into pressurized air. When air is compressed, its quantity decreases, growing its pressure. Air compressors generally have a minimal strain of thirty bars. The reduce stress band is the selection of air strain. Most compressors are managed independently, but network controls can be used to interconnect a number of compressors. This kind of controller will not function for all sorts of compressors. There are other types of air compressors that can talk with each other.
Compressed air has several apps in all kinds of industries. In agriculture, it can electrical power pneumatically run material dealing with equipment for irrigation and crop spraying. Dairy equipments also use compressed air. Compressors are also utilized in the pharmaceutical market for mixing tanks, packaging, and conveyor methods. Portable air compressors, which can be driven by diesel gas, are frequently utilized at distant drilling websites. Portable air compressors are also typically utilised in oil and gas. They can be used to remotely management valves and install reactor rods.
Regardless of whether you use an air compressor for agricultural functions or in a manufacturing environment, there are some functions to take into account when picking an air compressor for your demands. A good compressor will have a safety device. It will routinely shut off the enter air and output air once ample compressing has been attained. These attributes will assist your air compressor remain productive and defend your gear. The protection gadget is an critical attribute of any air compressor to boost its all round effectiveness.
Vane air compressors are the most frequent sort. They are typically smaller sized and significantly less effective than reciprocating piston compressors, so you can use one particular of these for programs that are beneath 100 horsepower. The vane air compressors have reduced compression ratios and higher capacities, but they are usually constrained to minimal-electricity apps. Vane compressors tend to run very hot, and they generally have a lower compression ratio. It is essential to decide on the appropriate oil viscosity for your compressor.
air-compressor

Solitary-phase models

When comparing solitary-stage air compressors, seem for the phrase “phases.” Multi-stage compressors use two stages and can take care of more capability and strain. One stage includes pressurizing air making use of a piston and a decrease-force cylinder. This compressed air is then moved to a storage tank. Single-phase versions have a tendency to be more strength-efficient than their two-phase counterparts. But if you don’t want a substantial-force cylinder, a one-phase air compressor can be the very best option.
Though one-stage air compressors create significantly less power, they can create sufficient air to power pneumatic resources and other pneumatic equipment. These solitary-phase units are most valuable for scaled-down-scale property assignments and Diy assignments. For more industrial purposes, a dual-phase product is the very best option. But if you happen to be in a hurry, a single-phase unit may possibly be enough. In the long run, it is dependent on what you plan to do with the air compressor.
One-phase air compressors attribute a one cylinder, a single piston stroke for every single revolution of pressurized air. One-phase compressors are generally smaller and much more compact, producing them a good decision for smaller sized function environments. Their cfm potential (cubic toes per minute) is an important indicator of functioning potential. If you program to use several pneumatic instruments, you will possibly want a greater cfm product. Equally, the horsepower of solitary-stage compressors signifies its doing work capacity. 1 horsepower moves 550 lbs . per foot for each minute.
Multi-phase air compressors are typically much more pricey and a lot more energy-efficient than single-phase units, but they can provide greater air flow prices. Whilst they may be much more complex, they can reduce general functioning expenditures. If you program on employing your air compressor for industrial or commercial use, a dual-phase design may possibly be the very best option. Even so, if you might be planning to use the air compressor for mass production, a single-stage design may possibly be the ideal choice.
One-phase air compressors have the same piston size and number of inlets, even though twin-stage designs have a more compact 1st piston and a a lot lengthier 2nd piston. The two have a cooling tube in between the two pistons to minimize the air temperature prior to the second round of compression. The single-stage product is generally small and moveable, even though the double-phase air compressor is stationary. These compressors can the two be stationary and huge.

Reduced-noise designs

In spite of its title, lower-noise versions of air compressors are not all the exact same. The sounds amount of a compressor can be afflicted by numerous variables, which includes the electrical power supply and proximity to the device. Reciprocal compressors are normally louder than electrical kinds since of their a lot of transferring areas. By contrast, rotary-screw and scroll compressors have fewer shifting components and are quieter.
The sounds level of a fuel-driven air compressor can be extremely high, generating it unsuitable for use indoors. To combat this issue, you can pick an electric design. The sound amount of a compressor is largely caused by motor friction. The protect of a piston is also a major issue in sound, as pistons with minimal handles will generate a good deal of sounds. Earlier, oil was necessary for a tranquil compressor. Nevertheless, this has changed thanks to the medical industry’s need for oil-free types.
The CZPT EC28M Silent Air Compressor is one more product that attributes tranquil operation. This air compressor makes 59dB of noise. This stage is low ample to enable you to carry on standard conversations while it cycles. In addition, this compressor has an industrial oil-free pump and a 2.8 Amp direct-generate induction motor. These two features make it a great selection for companies.
Lower-noise designs of air compressors are accessible for the design sector. Nevertheless, these compressors are not automatically lower-quality, which is why you should contemplate the sounds level of your air tool just before buying 1. The experts at CZPT can advise the low-sound designs for your specific software and area. Sounds can distract folks who operate near the air compressor. That is why numerous organizations now decide for these designs.
air-compressor

Oil-free of charge models

A number of oil-free of charge types of air compressors are obtainable, but what tends to make them particular? Oil-free of charge compressors don’t have oil, so they’re lubricated by grease rather. They’re a very good decision if you happen to be working with a tiny compressor and will not want to danger detrimental it. On the other hand, oil-totally free designs do generate important amounts of warmth, which can injury the compressor. Increased stress can grind the compressor against by itself, or even warp it.
A few words of understanding can aid you pick the best oil-cost-free air compressor for your wants. For example, a compressor’s horsepower is a measurement of how powerful the motor is. Increased horsepower means a larger PSI or ACFM. You can also use the ACFM to evaluate the two. Scroll engineering is a modern day air compression technique that employs a stationary and mobile spiral. This decreases the volume of air in the compressor by directing it to the centre.
Getting an oil-cost-free air compressor isn’t going to have to be a overwhelming process, though. A very good distributor can advise you on what type of oil-free air compressor is right for you. This way, you can conserve cash and get pleasure from peace of mind whilst employing your air compressor. And, of training course, the ideal way to get a great offer on an air compressor is to converse to a distributor who is knowledgeable about the goods obtainable.
An oil-totally free air compressor is a fantastic alternative for organizations that are sensitive to the contamination of air. For case in point, in the pharmaceutical and meals business, a minuscule oil could spoil a product or even injury production equipment. Oil-free of charge air compressors generally have decrease routine maintenance charges than oil-flooded designs due to the fact there are less transferring components. Simply because of this, oilless air compressors require much less routine maintenance and could even now require to be changed at times.
A handful of advantages of an oil-free of charge air compressor above an oil-lubricated one particular contain lower sound amounts. Oil-cost-free air compressors tend to be significantly less noisy and operate far more quietly than oil-injected ones, but you must still meticulously weigh the pros and downsides ahead of producing a decision. Also, consider how significantly you use your air compressor just before selecting a model. The execs outweigh the downsides. In the conclude, you will be glad you selected an oil-cost-free air compressor.

China Hot selling Screw Air Stationary Oil Lubricated Water Cooling Compressor (KF250-13)     with Hot sellingChina Hot selling Screw Air Stationary Oil Lubricated Water Cooling Compressor (KF250-13)     with Hot selling