China high quality Oil Free Screw Air Compressor Water Inject Lubricated CHINAMFG with high quality

Product Description

Product Description

Oil Free Screw Air Compressor Direct Driven Water Inject Lubricated Screw Compressor
The RW Oil free screw air compressor eliminates the risk of contamination with 100% oil-free air for applications that require the highest levels of purity like – medical – pharmaceutical production – food production – critical electronics The water-injected screw compressors, water-cooled or air-cooled, meet your needs for quality air with high-pressure capability and energy efficiency.

100% safe, high quality air
Rocky RW oil-free compressors eliminate the risks of oil contamination. Whether your activities are in pharmaceutical production, food & beverage, critical electronics or in a similarly exacting industry, air quality is paramount for your end product and production process.

Enjoy lower operating and maintenance costs with an CLASS 0 certified compressor.  

Zero risk
CLASS 0 means zero risk of contamination, zero risk of damaged or unsafe products, zero risk of losses from operational downtime.

Technical parameter

Oil-free Water Lubricated Screw Air Compressor RW Series  
Model Air Delivery (m3/min)  Power (kW)   Lubricating water
amount (Liters) 
 Cooling water amount T/Hour   Cooling water inlet/outlet diameter   Noise dB(A)   Outlet diameter   Dimension (mm)   Weight (Kg) 
 8 bar   10 Bar   12.5 bar   L*W*H 
 RW-08A/W   1.17   1.05   0.81   7.5   10   2.0   3/4″   58   3/4″   800*800*1200   470 
 RW-11A/W   1.65   1.42   1.10   11   26   2.5   1″   60   3/4″   1150*755*1340   580 
 RW-15A/W   2.43   2.17   1.80   15   26   3.5   1″   63   3/4″   1150*755*1340   650 
 RW-18A/W   3.13   2.82   2.05   18.5   30   4.0   1″   65   1″   1400*900*1450   705 
 RW-22A/W   3.52   3.21   2.78   22   30   5.0   1″   65   1″   1400*900*1450   745 
 RW-30A/W   5.12   4.43   3.63   30   40   7.0   1 1/2″   67   1 1/4″   1550*1150*1550(A) 1500*1150*1300(W)   1100 
 RW-37A/W   6.30   5.33   4.77   37   40   9.0   1 1/2″   67   1 1/4″   1550*1150*1550(A) 1500*1150*1300(W)   1150 
 RW-45A/W   7.40   6.30   5.56   45   90   10.0   1 1/2″   68   2″   1980*1300*1760(A) 1800*1300*1670(W)   1390 
 RW-55A/W   9.60   8.55   7.67   55   120   12.0   1 1/2″   70   2″   1980*1300*1760(A) 1800*1300*1670(W)   1470 
 RW-75A/W   13.00   11.50   9.70   75   120   18.0   1 1/2″   73   2″   2100*1600*1900(A) 2200*1500*1800(W)   2250(A) 1630(W) 
 RW-90A/W   14.80   13.90   12.60   90   180   20.0   1 1/2″   73   2 1/2″   2400*1600*2000(A) 2200*1500*1800(W)   2650(A) 2350(W) 
 RW-110A/W   19.85   16.66   15.56   110   180   24.0   2″   78   2 1/2″   3000*1700*2250(A) 2200*1500*1800(W)   3150(A) 2460(W) 
 RW-132A/W   23.10   19.97   16.90   132   240   30.0   2″   78   2 1/2″   3000*1700*2250(A) 2200*1500*1800(W)   3500(A) 2500(W) 
 RW-160W   28.11   25.45   22.52   160   240   35.0   3H   80   DN80   2700*1800*2050   3700 
 RW-185W   33.97   29.00   25.21   185   300   38.0   3″   80   DN80   2700*1800*2050   3750 
 RW-200W   36.75   32.78   29.24   200   300   42.0   4″   80   DN100   2700*1800*2050   3900 
 RW-220W   39.67   36.75   29.63   220   360   47.0   4″   80   DN100   2700*1800*2050   4200 
 RW-250W   43.50   39.30   34.00   250   360   58.0   4″   80   DN100   2700*1800*2050   4600 

Detailed Photos

Company Profile

ZheJiang CHINAMFG Machinery Co., Ltd. was established in 2003 and has 18 years of experience in the air compressor industry. It is an innovative enterprise integrating production, trade, service, research and development.

Our company dominates strong technical skill, advancing manufacture equipment and testing device, execute strictly of ISO9001 quality management system. As a CE certificated manufacturer, our Oil-free series air compressor also
reaches Germany TUV Class 0 standard.


Main products have passed the testing of national technical authorities, energy consumption level has reached the international advanced level.


With more than 120 skilled employees and 18 senior engineers, each production process is performed standardly and strictly. Germany technology and 14 years export experience have helped us to gain more than 30 loyal overseas agents, and our valued customers have spread across more than 130 countries.


CHINAMFG will continue to promote technological innovation and progress in line with the mission of “innovation reflects value”, and achieve CHINAMFG results with global partners, suppliers and employees. Create a new world of “energy saving, envir-onmental protection and intelligence” in the field of air compressors.


Q1. Are you trading company or manufacture ?
A: We are professional manufacture of screw air compressor of HangZhou,ZheJiang ,China. More than 18 years of experience in air compressor manufacturing.

Q2. How long is the delivery time ?
A: For standard voltage ,15 working days. Non-standard ,please contact our sales.


Q3. What’s payment term ?
A: T/T, L/C, D/P, Western Union, Paypal, Credit Card, and etc. Also we could accept USD, RMB, Euro and other currency.


Q4. How about your after-sales service ?
A: 1.Provide customers with installation and commissioning online instructions.
     2. Well-trained engineers available to overseas service.
     3.CHINAMFG agents and after service avaiable.arrange our engineers to help you training and installation.


Q5. How about your warranty?
A: One year for the whole machine and 2 years for screw air end, except consumable spare parts.


Q6. Do you have any certificate ?
A: Yes, per different customer’s market need ,we can offer CE ,ISO etc certificate.


Q7. What about the maintenance ?
A: First maintenance need to be done after 500Hours, and then every 2000-3000 hours to do the normal maintenance, and consider the actual environment.


Q8. How do you control quality ?
A: 1. The raw materials are strictly inspected
     2. Some key parts are imported from overseas
     3. Each compressor must pass at least 5 hours of continuous testing before leaving the factory.


Q9. Do you offer OEM service ?
A: Yes.Both OEM & ODM service can be accepted.


Q10.How long could your air compressor be used?
A: Generally, more than 10 years.

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After-sales Service: Online Support
Warranty: 2year
Lubrication Style: Oil-free


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Shipping Cost:

Estimated freight per unit.

about shipping cost and estimated delivery time.
Payment Method:


Initial Payment

Full Payment
Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

air compressor

What role do air dryers play in compressed air systems?

Air dryers play a crucial role in compressed air systems by removing moisture and contaminants from the compressed air. Compressed air, when generated, contains water vapor from the ambient air, which can condense and cause issues in the system and end-use applications. Here’s an overview of the role air dryers play in compressed air systems:

1. Moisture Removal:

Air dryers are primarily responsible for removing moisture from the compressed air. Moisture in compressed air can lead to problems such as corrosion in the system, damage to pneumatic tools and equipment, and compromised product quality in manufacturing processes. Air dryers utilize various techniques, such as refrigeration, adsorption, or membrane separation, to reduce the dew point of the compressed air and eliminate moisture.

2. Contaminant Removal:

In addition to moisture, compressed air can also contain contaminants like oil, dirt, and particles. Air dryers help in removing these contaminants to ensure clean and high-quality compressed air. Depending on the type of air dryer, additional filtration mechanisms may be incorporated to enhance the removal of oil, particulates, and other impurities from the compressed air stream.

3. Protection of Equipment and Processes:

By removing moisture and contaminants, air dryers help protect the downstream equipment and processes that rely on compressed air. Moisture and contaminants can negatively impact the performance, reliability, and lifespan of pneumatic tools, machinery, and instrumentation. Air dryers ensure that the compressed air supplied to these components is clean, dry, and free from harmful substances, minimizing the risk of damage and operational issues.

4. Improved Productivity and Efficiency:

Utilizing air dryers in compressed air systems can lead to improved productivity and efficiency. Dry and clean compressed air reduces the likelihood of equipment failures, downtime, and maintenance requirements. It also prevents issues such as clogging of air lines, malfunctioning of pneumatic components, and inconsistent performance of processes. By maintaining the quality of compressed air, air dryers contribute to uninterrupted operations, optimized productivity, and cost savings.

5. Compliance with Standards and Specifications:

Many industries and applications have specific standards and specifications for the quality of compressed air. Air dryers play a vital role in meeting these requirements by ensuring that the compressed air meets the desired quality standards. This is particularly important in industries such as food and beverage, pharmaceuticals, electronics, and automotive, where clean and dry compressed air is essential for product integrity, safety, and regulatory compliance.

By incorporating air dryers into compressed air systems, users can effectively control moisture and contaminants, protect equipment and processes, enhance productivity, and meet the necessary quality standards for their specific applications.

air compressor

What is the energy efficiency of modern air compressors?

The energy efficiency of modern air compressors has significantly improved due to advancements in technology and design. Here’s an in-depth look at the energy efficiency features and factors that contribute to the efficiency of modern air compressors:

Variable Speed Drive (VSD) Technology:

Many modern air compressors utilize Variable Speed Drive (VSD) technology, also known as Variable Frequency Drive (VFD). This technology allows the compressor motor to adjust its speed according to the compressed air demand. By matching the motor speed to the required airflow, VSD compressors can avoid excessive energy consumption during periods of low demand, resulting in significant energy savings compared to fixed-speed compressors.

Air Leakage Reduction:

Air leakage is a common issue in compressed air systems and can lead to substantial energy waste. Modern air compressors often feature improved sealing and advanced control systems to minimize air leaks. By reducing air leakage, the compressor can maintain optimal pressure levels more efficiently, resulting in energy savings.

Efficient Motor Design:

The motor of an air compressor plays a crucial role in its energy efficiency. Modern compressors incorporate high-efficiency electric motors that meet or exceed established energy efficiency standards. These motors are designed to minimize energy losses and operate more efficiently, reducing overall power consumption.

Optimized Control Systems:

Advanced control systems are integrated into modern air compressors to optimize their performance and energy consumption. These control systems monitor various parameters, such as air pressure, temperature, and airflow, and adjust compressor operation accordingly. By precisely controlling the compressor’s output to match the demand, these systems ensure efficient and energy-saving operation.

Air Storage and Distribution:

Efficient air storage and distribution systems are essential for minimizing energy losses in compressed air systems. Modern air compressors often include properly sized and insulated air storage tanks and well-designed piping systems that reduce pressure drops and minimize heat transfer. These measures help to maintain a consistent and efficient supply of compressed air throughout the system, reducing energy waste.

Energy Management and Monitoring:

Some modern air compressors feature energy management and monitoring systems that provide real-time data on energy consumption and performance. These systems allow operators to identify energy inefficiencies, optimize compressor settings, and implement energy-saving practices.

It’s important to note that the energy efficiency of an air compressor also depends on factors such as the specific model, size, and application. Manufacturers often provide energy efficiency ratings or specifications for their compressors, which can help in comparing different models and selecting the most efficient option for a particular application.

Overall, modern air compressors incorporate various energy-saving technologies and design elements to enhance their efficiency. Investing in an energy-efficient air compressor not only reduces operational costs but also contributes to sustainability efforts by minimizing energy consumption and reducing carbon emissions.

air compressor

How does an air compressor work?

An air compressor works by using mechanical energy to compress and pressurize air, which is then stored and used for various applications. Here’s a detailed explanation of how an air compressor operates:

1. Air Intake: The air compressor draws in ambient air through an intake valve or filter. The air may pass through a series of filters to remove contaminants such as dust, dirt, and moisture, ensuring the compressed air is clean and suitable for its intended use.

2. Compression: The intake air enters a compression chamber, typically consisting of one or more pistons or a rotating screw mechanism. As the piston moves or the screw rotates, the volume of the compression chamber decreases, causing the air to be compressed. This compression process increases the pressure and reduces the volume of the air.

3. Pressure Build-Up: The compressed air is discharged into a storage tank or receiver where it is held at a high pressure. The tank allows the compressed air to be stored for later use and helps to maintain a consistent supply of compressed air, even during periods of high demand.

4. Pressure Regulation: Air compressors often have a pressure regulator that controls the output pressure of the compressed air. This allows the user to adjust the pressure according to the requirements of the specific application. The pressure regulator ensures that the compressed air is delivered at the desired pressure level.

5. Release and Use: When compressed air is needed, it is released from the storage tank or receiver through an outlet valve or connection. The compressed air can then be directed to the desired application, such as pneumatic tools, air-operated machinery, or other pneumatic systems.

6. Continued Operation: The air compressor continues to operate as long as there is a demand for compressed air. When the pressure in the storage tank drops below a certain level, the compressor automatically starts again to replenish the compressed air supply.

Additionally, air compressors may include various components such as pressure gauges, safety valves, lubrication systems, and cooling mechanisms to ensure efficient and reliable operation.

In summary, an air compressor works by drawing in air, compressing it to increase its pressure, storing the compressed air, regulating the output pressure, and releasing it for use in various applications. This process allows for the generation of a continuous supply of compressed air for a wide range of industrial, commercial, and personal uses.

China high quality Oil Free Screw Air Compressor Water Inject Lubricated CHINAMFG   with high qualityChina high quality Oil Free Screw Air Compressor Water Inject Lubricated CHINAMFG   with high quality
editor by CX 2024-03-12