Tag Archives: rotary compressor ac

China Professional 250kw Variable Speed Drive Mute AC Two Stage Rotary Screw Oil Free Dry Air Compressor wholesaler

Product Description


  Model Capacitiy (FAD)M3/min Power kw Noise level db Weight KG
7bar 8.5bar 10bar Water Cooling Air Cooling
OFA1 OFA15 2.4 2.1 1.8 15 74   1,030
OFA22 3.7 3.2 2.7 22 74   1,070
OFA30 4.8 4.4 4.0 30 74   1,300
OFA37 5.9 5.3 5.0 37 74   1,355
OFA45 7.0 6.5 6.1 45 74   1,390
OFA2 OFA55 9.2 7.9 7.3 55 74   1,860
OFA75 12.2 11.2 10.7 75 74   1,935
OFA90 14.7 13.5 12.7 90 74   2,000
OFA3 OFA110 19.3 17.2 16.0 110 74   3,660
OFA132 22.9 19.5 18.8 132 74   3,700
OFA4 OFA160 29.4 25.7 23.8 160 74   5,300
OFA200 36.6 33.1 30.4 200 74   5,380
OFA250 44.5 41.0 37.4 250 74   5,450
OFA275 47.4 43.0 41.0 275 74   5,500
OFA5 OFA315 51.5 47.6 46.0 315 74   6,000
OFA355 56.3 52.6 50.4 355 74   9,050
OFW1 OFW37 5.9 5.3 5.0 37 74 1,355  
OFW45 7.0 6.5 6.1 45 74 1,450  
OFW2 OFW55 8.8 7.9 7.3 55 74 1,800  
OFW75 11.9 11.2 10.7 75 74 1,850  
OFW90 14.3 13.5 12.7 90 74 1,925  
OFW3 OFW110 19.1 17.1 16.0 110 74 2,635  
OFW132 21.9 19.6 18.9 132 74 2,760  
OFW4 OFW160 28.3 26.1 24.2 160 74 3,850  
OFW200 36.1 33.1 30.4 200 74 4,000  
OFW250 43.1 41.0 37.0 250 74 4,100  
OFW275 46.4 43.0 41.0 275 74 4,300  
OFW5 OFW315 50.9 47.6 46.0 315 74 6,550  
OFW355 56.3 52.6 50.4 355 74 6,950  
OFW400 62.1 57.8 55.8 400 74 7,050  
OFW450 76.5 71.5 63.8 450 74 8,400  
OFW500 83.9 78.3 73.1 500 74 8,400  
OFW630 102.9 95.7 89.0 630 74 9,125  
OFW750 122.8 109.6 101.8 750 74 9,225  

                                             Company Profile

ZheJiang Napu compressor Technology Co.,LTD was established in 2012  based in ZheJiang ,specializing in oil-free rotary screw air compressors, offering a wide range of products from airends to compressors . 
       With over 10 years experience in oil free screw air compressor. NAPU Compressor is compliant with ISO 8573-1, Class 0 standard and audited by TUV Rheinland and China National Quality Inspection Center of Compressor and Refrigerator.   
        The company is also compliant with ISO 9001:14001 and is CZPT in the domestic market for its quality-driven culture. The oil-free compressors manufactured by the company are used in a variety of sectors including some of our valued clients like CASC-China Aerospace Science Corporation, NORINCO-China North Industries Group, CNNC-China National Nuclear Group, CHANG AN AUTO, SINOPHARM, BYD and CALT and Sino-Chemical etc.
         Continuous improvement in productivity and efficiency is our goal, and we continue to offer an extensive services including our own branded oil-free compressor package as well as after-sales services for other leading brands.


                                              Product Features

1. In house designed airend
2. 100% oil free air certified by Germany TUV.
3. Double-layer structure to reduce he noise.
4. Air Cooling and Water cooling are available.
5. VSD control are available.
6.Touch Screen PLC with preset running schedule, more intelligent control.
7.OEM&ODM service are accepted



Q1. Are you trading company or manufacture ?
A: We are professional manufacture of oil free air compressors. More than 20 years of experience in air compressor manufacturing.
Q2. What’s payment term ?
A: T/T, Western Union, Paypal, Credit Card, and etc. Also we could accept USD, RMB, Euro and other currency.
Q3. How about your after-sales service ?
A: 1.We can provide customers with installation and commissioning online instructions.
Q4. How about your warranty?
A: One year for the whole machine and 5 years for screw air end, except consumable spare parts.
Q5. Do you have any certificate ?
A: Yes, we can offer CE ,ISO  and certificate as clients’ demande.
Q6. How do you control quality ?
A: 1. The raw materials are strictly inspected
    2. Each compressor must pass at least 8 hours of continuous testing before leaving the factory.
Q7.How long could your air compressor be used?
A: Usually, more than over 10 years.


After-sales Service: Online Support
Warranty: 12 Months
Lubrication Style: Oil-free
Cooling System: Water Cooling
Power Source: AC Power
Cylinder Position: Horizontal



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 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.


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?


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 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.

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 Professional 250kw Variable Speed Drive Mute AC Two Stage Rotary Screw Oil Free Dry Air Compressor   wholesaler China Professional 250kw Variable Speed Drive Mute AC Two Stage Rotary Screw Oil Free Dry Air Compressor   wholesaler
editor by CX 2023-05-17

China wholesaler Industrial Oilless Rotary Screw Air Compressor Closed To CZPT Wholesale 380V 3-40bar AC Power Electric Machine (ISO&CE) with Great quality

Product Description

.5-eighty M3/Min 6-forty Bar 5.5-400 Kw Electrical Stationary Industrial AC Electrical power Direct Pushed/Coupled Rotary Screw Air Compressors Rewards

1.DENAIR Improved power conserving screw air compressor reached the tremendous strength saving stage
2.Strength Efficient Index 1(EEI 1) accredited according to GB19153-2009, the vitality intake is 10%~15% lower than EEI 2.
3.CZPT air compressor design with 72 kinds of engineering patent, actual greater air flow 
four.State-of-the-artwork screw aspect, CZPT Germany CZPT air stop, ladvanced SAP profile style, exceptional Sweden CZPT element bearings
5.CZPT air compressdor dopts planet-renowned parts, this kind of as Schneider electronics from France, DENAIR filters from Germany, CZPT stress sensor from Denmark, and so on. lead to promise the compressor longer support life.
six.Smart touch screen design and 0 pressure fall design
7.Higher efficiency CZPT technique and electrical motor
eight.Stainless steel pipes, sensible interior layout, ensure long service life without having upkeep.

Technological Parameters Of Strength Conserving Rotary Screw Air Compressor 

*) Fad in accordance with ISO 1217 : 2009, Annex C: Absolute intake force 1 bar (a), CZPT and air ingestion temperature 20 °C
**) Sound degree as for every ISO 2151 and the fundamental standard ISO 9614-2, procedure at highest working strain and optimum velocity tolerance: ± 3 dB(A)
***) EEI 1- Energy Effiency Index 1, which refers to enhanced strength preserving series
Technical specs are topic to modify with no observe.

DENAIR Factory & Product Traces

DENAIR Exhibition

We carefully selected for you the classic case

Enhanced Strength Saving Air Compressor in Oman

Undertaking Name: Sandblasting in Muscat, Oman.

Item Name: 75KW 100HP Improved Strength Saving screw air compressor EEI 1 (Energy Efficiency Index 1) with air dryer, air receiver tank and air filters.

Model No. & Qty: DA-seventy five+ x 1.

Operating Time: From June, 2016 till now

Function: In June, 2015, 1 set of CZPT improved strength preserving air compressor technique was put in in Muscat Oman. This is the 1st project finished by CZPT distributor in Oman. Our partner Mr. Hari shared the photos at operating website to us as a good commencing. That means more and a lot more CZPT vitality saving solutions will lead to the industries in Oman in the around long term. CZPT air compressor manufacturing unit and air compressor distributor will consider the very best to supply best good quality merchandise, expense successful remedy and superb services for nearby customers in Oman. In buy to ensure the most professional services, the distributor strategies to ship 2 service engineers to CZPT factory in ZheJiang for instruction and learnin. We will update the information at that time.


Q1: Are you manufacturing facility or trade organization?  
A1: We are manufacturing facility.

Q2: What the precisely deal with of your factory? 
A2:No. 366, YangzhuangBang Avenue, Pingxing Rd., Xindai Town, HangZhou, ZHangZhoug Province, China

Q3: Guarantee terms of your air compressor equipment? 
A3: Two years warranty for the equipment and technical help according to your needs.

Q4: Will you give some spare elements of the air compressor? 
A4: Yes, of training course.

Q5: How prolonged will you consider to prepare creation? 
A5: 380V 50HZ we can shipping and delivery the items inside of 10 days. Other electricity or other colour we will supply inside 22 days

Q6: Can you settle for OEM orders? 
A6: Yes, with professional style crew, OEM orders are extremely welcome.

Decide on an Air Compressor for Your Enterprise

There are several aspects to contemplate when selecting an air compressor for your enterprise. One element to think about is the type of compressor you are seeking for, which could include one-phase, low noise, and constructive displacement. Hope this write-up aids you make the right determination. Right after all, your business good results will rely on this unit! Let us get a closer look at these variables. Also, contemplate what compressor producers say about their products.

Positive displacement

Good displacement air compressors compress air by drawing in a volume from an inlet and extruding it out of a chamber. This raises the stress at which the gasoline can be pumped at charges that cannot be pumped via the outlet at lower pressures at increased mass stream rates. These types of compressors are obtainable in single-performing and double-performing configurations. They are categorised by the quantity of cylinders.
There are two different sorts of air compressors: reciprocating air compressors and screw compressors. Each are roll equipment. Positive displacement air compressors use pistons and cylinders to compress air. The resulting air pressure builds up inside of the compressor housing, increasing the likely vitality of the compressed air. Screw air compressors are the most well-known good displacement air compressors, which can be possibly single-phase screw-blade air compressors or multi-phase screw-blade oil-immersed screw air compressors.
Positive displacement flowmeters use a rotating measuring chamber to divide the fluid into discrete portions. The amount of times the chamber was refilled and emptied was utilized to estimate the whole stream. However, positive displacement movement meters are susceptible to leaks, lowering the precision of the estimates. If a leak occurs, it can trigger false readings and damage the compressor. However, leaks in constructive displacement air compressors can decrease force.
The most widespread kinds of good displacement air compressors are screw, reciprocating, and vane. Rotary positive displacement air compressors are also available as effectively as many other air compressors. Positive displacement air compressors are most generally utilized in big manufacturing amenities. If you are thinking about an air compressor for business or industrial programs, it is essential to understand how the components of the device work. Make sure you go through the information under to discover far more ahead of selecting which software is ideal for you.
Good displacement air compressors use a piston to power air into a chamber, compressing the air in the procedure. The piston moves in the opposite direction, thus decreasing the volume of the chamber. When the quantity of air in the chamber reaches its highest worth, the valve opens, allowing it to escape at greater stress. Positive displacement air compressors are generally significantly less productive than centrifugal compressors. Even so, they are even now an excellent option for a selection of programs.


The discharge strain of the solitary-stage air compressor is utilized to control the operation of the compressor. Properly created load/unload controls let the air compressor to function at its most effective level although minimizing tension on the principal motor bearings. Solitary-stage air compressors can strategy variable pace performance with proper storage ability. Even so, inappropriate storage can cause premature bearing wear on the major unit. If this is the scenario, a single-phase air compressor may possibly not be best.
A single-stage air compressor has only one particular cylinder, which implies one particular stroke is necessary to shift air from one cylinder to an additional. Force is calculated in cubic ft for every moment or CFM. Tank dimensions is also important as a big solitary-stage air compressor could be needed to work a number of air resources. One-stage air compressors can be utilised in a selection of apps and can last for many years.
For the most widespread uses, solitary-stage air compressors are the most functional choice. These units work with most hand instruments, from hammers to grinders. One-phase air compressors are lightweight and effortless to shift. Nonetheless, two-stage air compressors supply much more CFM, producing them a far better decision for industrial or business use. Nonetheless, two-stage compressors are not suited for private use. Consequently, if your primary function is Do-it-yourself and craft initiatives, it is better to decide on a solitary-stage air compressor.
In comparison with two-stage air compressors, solitary-phase screw air compressors are less expensive. They appear from a selection of companies and assortment in electricity from 3 to 600 horsepower. Solitary-phase air compressors are a expense-effective remedy for a assortment of air compressor needs. They supply adaptability and numerous management approaches, making them an excellent selection for many various applications. Therefore, when deciding on an air compressor for your enterprise, decide on the one particular with the most suitable capabilities.
One-stage air compressors are the most cost-effective and simple-to-use air compressors for small to medium positions. They also have increased compression ratios. The compression ratio is the ratio of absolute discharge force to absolute inlet force. When calculating the ratio, it takes into account atmospheric force and gauge strain. The compression ratio pushes the surface location of ​​the rotor, which will increase the thrust load.
Solitary-phase air compressors are smaller sized and simpler to transport than two-stage models. Solitary-phase air compressors have one air intake, and two-stage air compressors have two air intakes. The big difference between one-phase and two-stage air compressors mostly is dependent on the variety of times the air is compressed. A single-stage air compressor compresses the air once, whilst a twin-stage air compressor compresses the identical volume of air two times.

minimal sound

Reduced noise air compressors are best for a selection of apps. Even though no air compressor is totally silent, some models are considerably quieter than others. For the Hitachi EC28M transportable compressor, the noise amount is 59 decibels. The compressor functions steel rollers that protect the inner components and give it a sleek, modern day seem. It also has a one-gallon gasoline tank and a fifty percent-horsepower push.
Sounds from air compressors can be distracting and decrease efficiency. It is essential to select low-noise air compressors to preserve staff healthier and pleased at work. Although sounds is an unfortunate factor of operating on the shop ground, lowering it can improve productivity. By minimizing distracting noise, staff can focus on their work and communicate far more successfully. That means higher quality function and happier consumers. If you might be seeking for a lower-noise air compressor, be confident to read through the guidelines below.
Lower noise air compressors are an excellent selection for businesses of all sizes. These powerful equipment can operate several resources concurrently. The two water tanks are produced of rust-resistant aluminum and are stackable. This air compressor is heavier and can manage massive jobs with simplicity. It costs much more than other air compressors, but it can take care of a whole lot of perform effectively. CZPT Air Resources air compressors appear with a one particular-year guarantee and are extremely recommended by contractors.
Noiseless air compressors are usually much more expensive than similar products, but they are well worth the further expense. Noiseless compressors are a good selection for firms that require to steer clear of disturbing nearby folks. For instance, you may well want to consider a low-sounds air compressor for a dental business office, which are not able to tolerate sounds. The good news is, this issue can be solved by relocating the compressor to a area that is a lot more isolated from your workspace.
A single model of lower-noise air compressors delivers two versions. The CZPT Air Resources 2010A attributes a massive forged aluminum can, regulating strain gauge, and two common quick-connects. It creates sixty eight decibels of noise when it performs. It has a massive 8-gallon gas tank capability and has wheels and handles for straightforward transportation. Its strong engine creates a reduced sound amount of sixty eight decibels.
An additional common reduced sound air compressor is the Makita MAC210Q Silent Series. This design is able of creating up to 71.5 decibels of audio, which is the quantity of air it makes at 90PSI. The MAC210Q functions a durable oil-free pump and weighs just 36 lbs . with a take care of and wheels. These compressors are easy to move and excellent for indoor function.
China wholesaler Industrial Oilless Rotary Screw Air Compressor Closed To CZPT Wholesale 380V 3-40bar AC Energy Electrical Device (ISO&CE)     with Excellent good qualityChina wholesaler Industrial Oilless Rotary Screw Air Compressor Closed To CZPT Wholesale 380V 3-40bar AC Electricity Electrical Machine (ISO&CE)     with Great high quality