Tag Archives: air compressor oil less

China factory Compact, 1.0HP 10L Twin Tank, Oil Free Silent, Oil Less Air Compressor with Best Sales

Product Description

Spec.

Model TAT-1571P Power(HP) 1.0
Noise(db) 62 Max Pressure 9.0BAR
Revolution 1420RPM Tank(L) 10
Max delivery 128L/Min N.W. (KG) 25.8
Packing (mm) 540*465*495 G.W. (KG) 28.8

Product featured;
1. Integrated control panel  
2. Flexible roll cage for easy traveling.  
3. strong rubber wheel
4.2Xcouplings more useful
5.4pole industrial motor with 2Xlonger life time
6. tool palette can fit with hose reel,5.Proffesional class with high pressure

Product overview;

Company overview;
HangZhou AXIHU (WEST LAKE) DIS. Mechanical and Electrical Industry Co., Ltd Established in 2009, we have been a compressor manufacturer specializing in silent air compressors for 12 years. Our company has passed ISO9001 quality management system certification and has a Chinese air compressor professional production license. “AXIHU (WEST LAKE) DIS.” is our registered trademark.
AXIHU (WEST LAKE) DIS. has completed hardware facilities, standard laboratory testing equipment, and normal production and quality control Procedures. It has developed more than 1 hundred kinds of models with advanced compressor professional engineers and technicians. In addition to the product certification of CE. ETL. SGS. It also has the ability to develop products and market independently, which can meet the needs of different requirements of customers. Many products have been sold to Japan, the United States, Australia, Europe, South America, and Southeast Asia.
HangZhou AXIHU (WEST LAKE) DIS. company will have the global market in view and adhere to the concept of manufacturing quality products, carrying through first-class service, and creating the best prestige. We are sincerely looking CZPT to cooperation with all friends in China and abroad, and developing the market to create a CZPT situation.Our exhibition;

 

 

After-sales Service: 1 Year Limited Warranty
Warranty: 1 Year Limited Warranty
Principle: Rotary Compressor
Application: Intermediate Back Pressure Type
Performance: Low Noise
Mute: Mute
Customization:
Available

|

air-compressor

How to Choose the Right Air Compressor

An air compressor uses pressurized air to power a variety of tools. They are most commonly used to power nailers and impact wrenches. Other popular uses for air compressors include paint sprayers and impact wrenches. While all air compressors have the same basic construction, their specialty differs. Ultimately, their differences come down to the amount of air they can push. Read on for information on each type of air compressor. These tools are great for many different purposes, and choosing the right air compressor depends on your specific needs.

Electric motor

While purchasing an electric motor for air compressor, compatibility is a key factor. Not all motors work with the same type of air compressor, so it’s important to check the manufacturer’s instructions before purchasing. By doing this, you can avoid wasting money on an incompatible motor. Another important consideration is speed. A motor’s speed is its rate of rotation, measured in revolutions per minute. It is critical that you purchase a motor with sufficient speed to meet the needs of your air compressor.
Typically, an electric motor for air compressor is 1.5 hp. It is ideal for use with medical equipment and metal-cutting machines. It also performs well under continuous operation and offers a high efficiency and energy-saving performance. Moreover, it features an attractive price, making it a good choice for a wide range of applications. If you are looking for a motor for an air compressor, look no further than a ZYS series.
A motor’s protection class indicates how the motor will operate. Protection classes are specified by the IEC 60034-5. These are stated with two digits and represent the protection against solid objects and water. For example, an IP23 rating means that the motor will be protected from solid objects, while IP54 means that it will protect from dust and water sprayed from all directions. It is vital to choose a motor with the correct protection class for your air compressor.
When choosing an electric motor, you should consider whether it’s compatible with the brand of air compressor. Some may be compatible, while others may require advanced electronics skills to repair. However, most air compressors are covered by warranty, so it’s important to check with the manufacturer if the warranty is still in effect before you spend a dime on a replacement. The motor should be replaced if it has failed to perform as designed.
air-compressor

Oil bath

Air compressors require proper lubrication to function efficiently. The piston must draw air with minimal friction. Depending on their design, air compressors can either be oil-lubricated or oil-free. The former uses oil to reduce piston friction, while the latter splashes it on the cylinder bearings and walls. Such air compressors are commonly known as oil-flooded air compressors. In order to keep their oil baths clean, they are recommended for use in locations with high dust levels.

Start/stop control

An air compressor can be controlled by a start/stop control. This type of control sends a signal to the main motor that activates the compressor when the demand for air falls below a preset limit. This control strategy is effective for smaller air compressors and can be useful for reducing energy costs. Start/stop control is most effective in applications where air pressure does not change frequently and where the compressor is not required to run continuously.
To troubleshoot this problem, you need to check the power supply of your compressor. To check the supply side, use a voltage monitor to determine if power is flowing to the compressor. Ensure that the power supply to the compressor is steady and stable at all times. If it fluctuates, the compressor may not start or stop as expected. If you cannot find the problem with the air compressor power supply, it may be time to replace it.
In addition to the start/stop control, you may want to purchase additional air receivers for your air compressor. These can increase the capacity of air stored and reduce the number of times it starts and stops. Another way to decrease the number of starts per hour is to add more air receivers. Then, you can adjust the control to match your requirements. You can also install a pressure gauge that monitors the compressor’s performance.
Start/stop control for air compressors can be complex, but the basic components are relatively easy to understand. One way to test them is to turn the compressor on or off. It is usually located on the exterior of the motor. If you’re unsure of the location of these components, check the capacitors and make sure that the air compressor is not running while you’re not using it. If it does, try to remove the capacitor.
Variable displacement control is another way to adjust the amount of air flowing into the compressor. By controlling the amount of air, the control can delay the use of additional compressors until more required air is available. In addition to this, the device can also monitor the energy used in the compressor. This control method can result in substantial energy savings. You can even save on the amount of electricity by using variable displacement control. It is essential for efficient compressed air systems.
air-compressor

Variable speed drive

A VFD, or variable frequency drive, is a type of electric motor that adjusts its speed to match the demand for air. It is an efficient way to reduce energy costs and improve system reliability. In fact, studies have shown that a 20% reduction in motor speed can save up to 50% of energy. In addition, a VFD can monitor additional variables such as compressor oil pressure and motor temperature. By eliminating manual checks, a VFD will improve the performance of the application and reduce operating costs.
In addition to reducing energy costs, variable-speed drives also increase productivity. A variable-speed air compressor reduces the risk of system leaks by 30 percent. It also reduces the risk of system leaks by reducing pressure in the system. Because of these advantages, many governments are promoting this technology in their industries. Many even offer incentives to help companies upgrade to variable-speed drives. Therefore, the variable-speed drive can benefit many air compressor installations.
One major benefit of a variable-speed drive is its ability to optimize energy use. Variable frequency drives are able to ramp up and down to match the demand for air. The goal is to optimize the pressure and flow in the system so that the best “dead band” occurs between forty percent and eighty percent of full load. A variable-speed compressor will also increase energy efficiency because of its programmability.
A variable-speed air compressor can also be used to control the amount of air that is compressed by the system. This feature adjusts the frequency of power supplied to the motor based on the demand. If the demand for air is low, the frequency of the motor will reduce to save energy. On the other hand, if there is an excess demand for air, the variable-speed compressor will increase its speed. In addition, this type of air compressor is more efficient than its fixed-speed counterpart.
A VFD has many benefits for compressed air systems. First, it helps stabilize the pressure in the pipe network, thereby reducing the power losses due to upstream pressure. It also helps reduce the power consumption caused by fluctuations in upward pressure. Its benefits are also far-reaching. And as long as the air pressure and air supply is properly sized, a VFD will help optimize the efficiency of compressed air systems.

China factory Compact, 1.0HP 10L Twin Tank, Oil Free Silent, Oil Less Air Compressor   with Best SalesChina factory Compact, 1.0HP 10L Twin Tank, Oil Free Silent, Oil Less Air Compressor   with Best Sales
editor by CX 2023-06-02

China 100 Liter 50l Mini Mobile Oil Less 50 Litre Dental Silent Portable Air Compressor for Spray Painting 0.75kw1hp 138 M3min 1440 arb air compressor

Error:获取返回内容失败,
Your session has expired. Please reauthenticate.

air-compressor

The Air Compressor Is a Versatile Tool

The Air Compressor is one of the most versatile tools in any garage or workshop. It is easy to use and can perform a variety of tasks, from jackhammering to drilling. These machines are available in a wide variety of sizes and types, making it an excellent choice for a variety of situations. With a single motor, you no longer need separate motors for each tool. Its lightweight, compact design makes it easy to handle, and the single motor also reduces wear on parts.

Oil-injected

Oil-injected air compressors require a large amount of lubricant, which needs to be added to the sump regularly to maintain optimum performance. As there are many types of industrial fluids, a well-intentioned maintenance technician may add the wrong lubricant to the compressor. If this happens, the compressor will become incompatible with the lubricant, resulting in excessive carryover and the need to flush and replace downstream air treatment components.
Typically, the G 110-250 oil-injected rotary screw compressor from Atlas Copco provides reliable compressed air, preventing costly downtime. The G110-250 oil-injected rotary screw compressor is highly reliable and durable, enabling it to function in temperatures up to 46degC/115degF. Despite the oil-injected air compressor’s robust design, this unit requires very little on-site installation, and it features simple operation.
The primary advantage of oil-injected air compressors is the reduced cost of running. The cost of oil-free compressors is less than half of that of oil-injected ones, and it will require fewer maintenance costs in the long run. Moreover, the oil-free system is more environmentally friendly than oil-injected air compressors. But the drawbacks of oil-injected air compressors are substantial, too. It can contaminate finished goods and cause a significant financial risk for the manufacturer.
An oil-injected rotary screw air compressor offers several advantages over its counterpart. First, it features an innovative vertical design with variable-speed drive, allowing it to run more efficiently. Second, oil-injected air compressors reduce energy consumption by up to 50% compared to non-oil-injected air compressors. They also have a thermostatic valve, allowing them to maintain an optimum temperature. Thermostatically-regulated oil coolers allow the compressor to run more quietly.

Oil-free

What is an oil-free air compressor? The name refers to a type of air compressor that does not contain oil in the compressor chamber. Oil-free air compressors still use oil for various purposes, including lubricating the moving parts and managing waste heat. However, many people do not realize that their air compressor still requires oil for proper functioning. This article will explore why this type of air compressor is preferable for many users.
First of all, oil-free air technology has many benefits. For one, it reduces the energy cost involved in filtering air, and it minimizes leaks. Moreover, it also reduces the oil costs associated with compressor refills. And finally, it reduces the risks of contamination. Oil-free air technology is the future of compressed air. If you’re looking for an oil-free air compressor, here’s what to look for in your search.
Depending on the purpose of your air compressor, it may be beneficial to invest in an oil-free air compressor. Oil-lubricated air compressors are generally more durable than their oil-free counterparts, but they may cost twice as much. You should still consider the cost of ownership before purchasing an oil-free compressor. The oil-free models can be easier to transport, and they are more powerful. Moreover, they’re quieter than oil-lubed models.
An oil-free air compressor also means less maintenance, as it doesn’t need oil to work. This type of air compressors also features fewer moving parts, which means fewer places for problems to develop. All oil-free air compressors are manufactured to meet ISO Class 0 and 1 air purity standards. They also have less noise and vibration compared to their oil-based counterparts. So, why not choose an oil-free air compressor for your business?
air-compressor

Gasoline

When choosing a gas-powered air compressor, it’s important to consider the advantages of gasoline. This energy source can power a large air compressor without electricity. However, this type of air compressor lacks electrical hookup, so you’ll need to run an extension cord if you need to use it at a distance. However, gas compressors are able to function with just a gas tank. This makes them ideal for medium to heavy-duty industrial applications.
Another important consideration when choosing a gas air compressor is its size. Larger compressors are typically larger than portable ones and require more space. This makes them easier to transport and operate on the go. However, if you’re not sure which type of air compressor is best for you, consider the gas-powered versions. While they may be lighter, they don’t run as smoothly as their electric counterparts. Gasoline-powered compressors are not as portable as their electric counterparts and require proper maintenance.

Electricity

Electricity in an air compressor is not cheap. A 25 HP air compressor runs for ten hours each day, five days a week. The motor in these machines consumes 746 watts per hour. To find out how much electricity the equipment uses, multiply the wattage by the running time. For example, if the compressor runs for three hours, then it will use 1.9 kilowatt hours of electricity. To determine how much electricity an air compressor uses per day, you can calculate the kilowatt hours and multiply the number by the utility rate. Considering this, you can determine the cost of running your air compressor once per month.
The cost of operating an air compressor depends on the type of compressor. Electric air compressors are often silent and can run without any maintenance. These tools can be left unattended for up to four thousand hours before requiring repair. Electric air compressors require higher power for higher pressure, so you should plan accordingly. Whether or not you need a maintenance visit is up to you, but the benefit of not having to spend a fortune on repairs is priceless.
Although compressed air is not an energy-efficient source, its use in a variety of applications may save you money and kilowatts. Since an air compressor uses power when it is running, the cost is lower than the cost of operating a power tool. If you plan to use your air compressor for a long time, make sure that it is maintained properly. Proper care will save you money and power, and you may even be able to get an extended warranty if the compressor breaks down.
air-compressor

Variable frequency drive

The main purpose of a variable frequency drive (VFD) in an air compressor is to reduce energy consumption in the process of compression. A single motor drag system cannot adjust its speed continuously according to the weight of the load. By applying frequency control to the compressor, the power consumption can be reduced while maintaining the same pressure level. Therefore, a VFD is an excellent choice for compressors. Its benefits are numerous.
A VFD can also monitor the temperature of the motor and send error signals if the motor is running too hot or too cold. This eliminates the need for a separate sensor to monitor the oil pressure. These functions are useful not only in lowering energy consumption, but also in improving the performance of an application. Moreover, a VFD can monitor additional variables such as temperature and motor speed. Hence, it is a useful investment.
When using a VFD, it is crucial to choose the right motor. The speed of the compressor should be within the maximum starting limit of the motor. The air tank may be of any size, but a constant pressure limit is required to keep the VFD running within the service factor of the motor. In addition to a VFD, a master controller should also include a remote pressure set point and a PID card for a master controller. The transmitter should incorporate all useful data from the VFD, including the speed and the oil temperature. The VFD must be tested before it is integrated with the master control. It should be tested for min and max speed, temperature, and current within the expected range.
The use of a VFD in an air compressor has many benefits. One of the most notable is the reduction in power consumption. Fixed-speed compressors run on set points of six to seven bar. An extra bar of compression uses 7 percent of energy. This energy is wasted. A VFD-powered air compressor can also increase the life span of compressor parts. It is one of the best investments in your compressor. So, why wait any longer?

China 100 Liter 50l Mini Mobile Oil Less 50 Litre Dental Silent Portable Air Compressor for Spray Painting 0.75kw1hp 138 M3min 1440     arb air compressorChina 100 Liter 50l Mini Mobile Oil Less 50 Litre Dental Silent Portable Air Compressor for Spray Painting 0.75kw1hp 138 M3min 1440     arb air compressor
editor by CX 2023-04-24

China Standard 8bar High Efficiency Silent Variable Speed Oil Less Screw Air Compressor for Nitrogen Making Machines with Best Sales

Item Description

8bar substantial effectiveness silent variable pace oil less screw air compressor for Nitrogen making machines 

one. Photograph & Features for our Twin Rotary screw air compressor :

2. Positive aspects  for our ZheJiang Great Air Compressor Manufaturing :

 

3.Generation introduction  for 8bar substantial performance silent variable pace oil less screw air compressor for Nitrogen producing machines :

Functions:
one.One particular shaft kind framework
two.Difference speeds,everlasting magnet motor with higher efficiency, exceptional power-preserving impact
3.Small quantity, lower sound
4.Steady operation

Benefits:
The long lasting magnet motor continues to be large performance at minimal speeds, guaranteeing apparent power-saving rewards in little air quantity
-Frequency variety from %-100%(common conversion from 60%-one hundred%)
-In contrast with the set speed compressor, CZPT saving 22%-forty%
-When compared with the widespread inverter compressor, CZPT preserving 5%-fifteen%
Method volume fluctuations larger, the strength-saving effect far more obvious.

Goods range :

Motor energy:5.5kw-630 kw/7.5hp-840hp , stream capacity:.6-111 m³/min, pressure: 7-thirteen bar 

Technological  Parameters:
 

4. Certification:


5.Purposes:

seven. FAQ:
Q1: Are you manufacturing facility or trade firm?  
A1: We are manufacturing unit.
Q2: Warranty conditions of your machine? 
A2: One calendar year guarantee for the equipment and technological assistance in accordance to your requirements.
Q3: Will you provide some spare elements of the equipment? 
A3: Yes, of system.
This autumn: How long will you just take to arrange manufacturing? 
A4: 380V 50HZ we can supply the products inside of 20 days. Other voltage we will shipping and delivery within thirty times.
Q5: Can you settle for OEM orders? 
A5: Yes, with professional design team, OEM orders are highly welcome!

8. Speak to:

 

A Buyer’s Manual to Air Compressor Types

There are a lot of kinds of Air Compressors, and it’s crucial to recognize what every type has to supply. In this article, we’ll discuss solitary stage air compressors, minimal-noise compressors, and designs with two pistons. But, prior to you buy an Air Compressor, be confident to read through our buyer’s information to the different kinds. This way, you will have all of the data you need to make the correct decision for your business.
air-compressor

One-phase air compressors

A solitary-stage air compressor is an exceptional choice for most standard-goal needs. They supply adequate power to function pneumatic equipment, and they create significantly less warmth. One-stage air compressors, nonetheless, are not ideal for hefty-duty industrial employs. Nonetheless, they can be used in different programs, like automobile stores, gas stations, and various producing services. They are also suitable for borewells and other large-pressure areas.
These air compressors are a wonderful option for house use and are suitable for little-scale organizations, contractors, and little stores. These compressors have ongoing duty cycles, forged iron compressor pumps, and a minimal 5,000-hour pump existence. They also attribute innovative characteristics, like ODP motors, Vehicle Commence & Controls, Receiver tanks, and electrical power cords. They have lower routine maintenance and can help save you a wonderful deal of income.
Solitary-phase air compressors are typically considerably less expensive and lighter than their two-phase counterparts. Single-phase air compressors are also much more transportable, which is a furthermore for small tasks. While two-phase compressors provide higher CFM, they are much more potent and cumbersome, making them unsuitable for little or house use. So it is important to decide what you will use the air compressor for and choose on a model based on your needs.
A solitary-phase air compressor is made of a piston and a tank. The piston moves speedily within the cylinder and exerts stress on the cylinder. This indicates that the piston can’t shift any more rapidly than the air pressure exterior the cylinder. The piston is designed to operate in the very same way for each and every stage. This is a fantastic selection for property outlets and a single-gentleman automotive retailers, as it enables you to control the force with no sacrificing the pump’s life.
One-stage air compressors are often cheaper than two-phase versions, but they are not the greatest choice for each software. If you are only making use of your air compressor sometimes, you may uncover a one particular-stage design to be significantly more reputable than a two-stage model. The primary difference between the two types of compressors is in the sum of air that every single stage compresses. A two-stage air compressor will have a lot more air storage ability, but it will still generate far more force.

Rotary vane compressors

Rotary vane compressors use a centrifugal pump to compress air. The rotor is established eccentrically in the housing, which almost touches the vane. As the rotor turns, the air that enters the pump is trapped in between the vanes. This compressed air undergoes compression as the rotor rotates. Vanes are tiny pieces of carbon fiber or graphite composite. Vanes may possibly be manufactured of different materials based on the application.
Even though rotary vane pumps are not typically utilized to produce compressed air, they are widely utilised in automotive and hydraulic purposes. Probabilities are, you have utilised a rotary vane pump at some stage in your life. These pumps are also widespread in the vacuum and compressed air industries. As a outcome, a lot of men and women do not understand that they’re even now about. They attribute slots that permit the vanes to slide in and out of the rotor.
A rotary vane compressor has a drum and rotor within. The rotor is eccentrically positioned and has slots and grooves on its surface area. Its inlet and outlet ports are located off-heart, allowing the vanes to be pushed out by centrifugal power. Due to the fact the rotor rotates so swiftly, air is trapped in between the vanes. This air then turns into pressurized by the rotating rotor.
Rotating vane compressors can be easily serviced and fixed. A simple replacement of carbon vanes needs just 15 minutes and typical equipment. The carbon vanes normally very last 9 to eighteen months, relying on technique working strain. Just before purchasing a rotary vane compressor, make confident to examine whether it has been properly efficiency-analyzed and has a warranty. Generally, warranties cover the rotor/stator chambers but do not cover the vanes or air filters. You must also examine if the unit is covered by a lightning or drinking water injury guarantee.
Rotary vane compressors are an integral element of manufacturing industries. Several pharmaceutical manufacturing facilities count on rotary vane compressors to handle their tools. Other industries that use rotary vane compressors include the plastics, woodworking, all-natural gasoline, and health-related & dental fields. Their positive aspects are quite a few and far outweigh any down sides of rotary screw compressors. For illustration, a rotary vane compressor can double the lifestyle of a traditional compressor.
air-compressor

Rotary vane compressors with reduced-sounds versions

If you are looking for a rotary vane air compressor, you have arrive to the appropriate place. CZPT’s LV Sequence rotary vane compressors offer minimal-sound types, compact size, and strong integration. In addition to their minimal-noise characteristics, they characteristic massive filter techniques to produce high-quality compressed air. The LV Collection designs also function CZPT’s reputation for dependability and quality.
This variety of compressor makes use of centrifugal drive to run and is constrained in its prime and bare minimum functioning speeds. They are only a 3rd as powerful as screw compressors, and their top pace limits are considerably reduced. In addition, the vanes put on out effortlessly at higher speeds simply because there is not adequate centrifugal force to seal them in opposition to the cylinder’s edges. Even at 50 % their entire potential, they consume as considerably as eighty% of their whole vitality rating.
Due to the fact piston compressors create a lot of sounds, factory house owners and store house owners have begun to put in sounds-dampening cabinets and other options. But, rotary vane compressors produce far much less sound than a classic vacuum, and the routine maintenance fees are also reduced. Rotary vane compressors are also very useful in many industries. They are used in the automotive and automobile ending industries, as effectively 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 h2o. This is far more than adequate airflow for two to 5 diffusers. A 1/4 HP rotary vane package pumps about 4.2 CFM. It also aids to boost circulation and oxygen amounts in the pond. Lastly, a 1/4 HP kit gives the essential electricity to clean up the bottom of a pond.
The rotary vane and rotary screw are the most popular air compressors these days. While they are equivalent in many approaches, they are a lot more flexible and durable than their counterparts. They use less angular contact ball bearings and call for less repeated servicing than piston air compressors. In contrast to piston air compressors, rotary vane and rotary screw compressors are quieter and are significantly less pricey.
air-compressor

Rotary vane compressors with two pistons

The rotary vane and rotary screw compressors are similar in application, but the two have various benefits and disadvantages. This post will assess the advantages of each and every and emphasize the differences amongst them. Even though each are typically utilized in industrial purposes, rotary vane compressors are favored by a lot of industries. These compressors also have a extensive range of makes use of, ranging from automotive air device operation to milking equipment. These compressors also have the edge of currently being quieter than piston-run ones.
The recent common rail place may possibly not be ideal for strain swirl injectors, but new positions have been tested and present improvements in certain vitality values. Furthermore, the existing placement is not required for exterior oil pumps. Even so, mass induction and expulsion have to be done with utmost treatment. This article focuses on the design and style and performance of rotary vane compressors. You can uncover a lot more data about this new layout in the references described beneath.
The rewards of this sort of compressor are its reduced expense, compact size, and easy routine maintenance. Hence, they are desired in lower potential applications. In addition, they feature built-in vanes. The rotating vanes shut the air hole and compress air toward the outlet. In contrast to piston-run compressors, these models are cheaper and much more reputable. As a result, you must choose one with the least expensive value tag. You can also decide for rotary vane compressors that are oil-free of charge.
Sliding vane compressors are one more popular variant. They have a solitary cylinder connected to the compressor and are able of operating at low speeds. This style also decreases the volume of friction and maintains volumetric performance. However, the sliding vane compressors undergo from higher frictional losses. If you are looking for a a lot more effective rotary compressor, this is the greatest choice. Even though sliding vane compressors have been in the highlight for more than a century, they are nevertheless very younger.
These compressors are simple to install and keep. They are also quieter than piston compressors. They are also cheaper than piston-pushed compressors. The vitality effectiveness and lower price make them the ideal decision for any commercial or industrial application. If you’re seeking for a modest, compact compressor, the rotary vane has been confirmed to be the ideal choice for your wants. You must know that it has a lengthy services existence.

China Standard 8bar High Efficiency Silent Variable Speed Oil Less Screw Air Compressor for Nitrogen Making Machines     with Best SalesChina Standard 8bar High Efficiency Silent Variable Speed Oil Less Screw Air Compressor for Nitrogen Making Machines     with Best Sales