China high quality 7.5kw 15kw 22kw Screw Air Compressor High Pressure Air Compressor AC Air Compressor Direct Driven Air Compressor Oilless Oil Free Air Compressor portable air compressor

Product Description

7.5kw 15kw 22kw Screw Air Compressor High Pressure Air Compressor IP55 Direct Driven Factory Direct Air Compressor Oilless Oil free  Air Compressor 

Promises Every Machine Will Run Well More Than 15 Years 

Product Description


Brief Introduction:

Air end: Germany Technology. 30 years designed lifetime.
Motor: Top quality ,IP54 or IP55
Inverter: Danish brand inverter can save 30% energy.
Warranty: 5 years for the air end, and 2 years for the whole compressor. 
Delivery time: 7-15 days. 
After-sales service:we have our professional after-sales technician to instruct the installation of the whole screw air compressor.    
Certificate: CE/ISO9001/ASME
We offer free pipe and valves for installation and installation diagram


Basic introduction of screw air compressor


Model :  7.5kw 15kw 22kw Screw Air Compressor 380V/3pH/50Hz IP55 Direct Driven Factory Direct
Type:  Energy Saving Air Compressor
Voltage:  380V/50HZ/3P, 220V/60HZ/3P, 400V/50HZ/3P, 415V/50HZ/3P or Customer′s Requirements
Working Pressure:  7~12.5 bar
Installed Motor Power:  11kw
Capacity: 1.5-0.8m3/min
Color:  Blue or gery
Driven Method: Direct drive
Air End: Original Ally-win Air End from Germany
Trademark:  Hengchaowin
Transport Package:  Standard Wooden Packing
Available Certificate:  CE, ISO, UL, ASME, GHOST
Origin:  ZheJiang , China
application:  Casting , Metal , Plastic , Rubber

Detailed Photos

1.permanent magnet motor.
Exceed IE3 standards
IP54 or IP55 protecting grad
Variable speed drive

2.Germany technology air end 
R&D in Germany GU or CHINAMFG brand air end
designed for 10 years +of reliable operation

3.Inlet valve
same desige as CHINAMFG Rand 
No blow-off losses/large suction are
Full aluminum design,maintenance-free

4.oil gas tank & built in separation system. 
Oversized air end oil tank with sight glass
The high efficiency oil seperator ensures that the oil carry over in less than 3ppm.
System pressure loss,less than 0.02mpa.

5.Polt touch controller
HD color touch LCD screen
Operation record/chart display
Weekly timer/service history and plHangZhou
Real-time operation/maintenance/alarm information

6.Innovative vectorial inverter
CE,UL,CUL,ROSH certification
Independent cooling air duct design
Robust enclosure for trouble-free operation in the harshest conditions.


Product Parameters


HW-7T HW-11T HW-15T HW-22T HWV-30A HWV-37A
air flow
flujo de aire
Lliter/min 1 0.9 0.8 1.5 1.3 1.1 0.8 2.4 2.1 1.5 1 3.5 3.1 2.7 1.7 4.3 3.6 2.4 2.9 5.8 5.2 2.8 3.2
35 31 28 52 46 39 28 74 74 52 35 124 109 95 35 151 127 74 102 205 183 98 112
working pressure
presión laboral
bar(kg) 8 10 12.5 8 10 12.5 15 8 10 12.5 15 8 10 12.5 15 10 12.5 15 20 10 12.5 15 20
psi 116 145 174 116 145 174 217 116 145 174 217 116 145 174 217 145 174 217 290 145 174 217 290
KW / HP 7.5kw/
noise db(A) 62±2 66±2 66±2 68±2 68±2 72±2
Caliber inch RP 1/2 RP 1/2 RP 1/2 RP 1/2 RP 1 RP1 1/2
Voltage/Frequency AC 380v/415v/220v/480v   or   50hz/60hz  accpet Customized voltage
Starting mode
Modo de inicio
variable frequency start  
inicio de frecuencia variable
air dryer
m³/min 1.5 1.5 2.5 3.8 / /
line filter
filtro de línea
m³/min 1.5 1.5 2.5 3.8 / /
air tank
tanque de aire
liter 300 400 400 600 / /
Shape dimension
L 1700 1180 1180 1600 1300 1450
W 800 800 800 110 910 910
H 1689 1210 1210 1290 1290 1290
Weight KG 500 600 650 700 520 720

Hot products
1. direct drive rotary screw air compressor
2. energy saving VSD air compressor
3. air compressor with air tank and air dryer
4. 2 stage VSD screw air compressor


Company Profile

Why Choose Us

HangZhou CHINAMFG Technology Co., Ltd., founded in 1985, in ZheJiang ,China, It is a professional air compressor manufacturer with 30 years of experience in R&D, manufacturing, marketing and service.

After the technical system reform in 2000, the company introduced German advanced CHINAMFG technology, adhering to the German advanced industrial design concept, rigorous manufacturing technology and comprehensive management. We strictly implement ISO9001 international quality system certification and EU CE standard production machines. The performance and quality of our products have been widely recognized and praised by the market, occupying 30% of China’s market share.
Starting to enter overseas markets in 2571, it currently has agents and after-sales teams in North America, Western Europe, South Africa, East Africa and other regions.

Brief introduction of factory:
1. We have been engaged in R D department, production and sales of air compressors  for 30 years;  
2. Our air compressor products through  CE,SGS,ISO  certification, with more than 20 invention patents;  
3. Our products are exported to  132  countries and regions around the world;  
4. Our air compressor provides a 5-year warranty.  
If you have specific parameters and requirements for our Rotary Screw Type Air Compressor, customization is available

Customer feedback

Providing high-quality machines is our standard, and satisfying every customer is our pursuit. Over the years, we have won unanimous praise from overseas users for our integrity and high-quality product quality.


Packaging & Shipping

The air compressor is guaranteed for 1 year and 5 years for the screw(air end) . Warranty time is calculated from machine leave the factory.



Q1: How long could your air compressor be used?
O: Generally, more than 10 years

Q2: What’s payment term?
O: T/T, L/C, Paypal and etc. Also we could accept USD, RMB, Euro and other currency (Pls contact our sales for more information

Q3: How about your customer service?
O: 24 hours on-line service available

Q4: How about your after-sales service?
O: 1. Provide customers with installation and commissioning online instructions.
2. Well-trained engineers available to overseas service
3. World wide agents and after service available /* January 22, 2571 19:08:37 */!function(){function s(e,r){var a,o={};try{e&&e.split(“,”).forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1

After-sales Service: Support Online and Local Service
Warranty: 1 Year
Lubrication Style: Lubricated


.shipping-cost-tm .tm-status-off{background: none;padding:0;color: #1470cc}

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 Maintenance Is Required for Oil-Free Air Compressors?

Maintaining oil-free air compressors is crucial to ensure their optimal performance, reliability, and longevity. While oil-free compressors have lower maintenance requirements compared to oil-lubricated compressors, regular maintenance tasks are still necessary. Here’s a detailed explanation of the maintenance required for oil-free air compressors:

1. Regular Filter Replacements:

Oil-free air compressors have filters that help remove contaminants from the intake air. These filters should be regularly inspected and replaced as recommended by the manufacturer. Filters can become clogged over time, affecting the compressor’s efficiency and potentially increasing the risk of contaminants entering the compressed air stream. Regular filter replacements ensure proper air filtration and help maintain the desired level of air purity.

2. Condensate Drainage:

Oil-free compressors produce condensate, which is a mixture of water and oil-free compressed air. Proper condensate drainage is essential to prevent water buildup in the system, which can lead to corrosion and damage. Most oil-free compressors have automatic condensate drains that remove accumulated condensate. It’s important to regularly check and maintain these drains to ensure they are functioning correctly and prevent any blockages or leaks.

3. Inspection of Air Hoses and Connections:

Regularly inspecting air hoses, fittings, and connections is important to identify any leaks or damage. Leaks can lead to air pressure loss, reduced compressor efficiency, and increased energy consumption. Damaged hoses or connections should be repaired or replaced promptly to maintain the integrity of the compressed air system. Regular inspections can help identify potential issues early on and prevent costly breakdowns or inefficiencies.

4. Monitoring Air Pressure and Temperature:

Monitoring the air pressure and temperature of the compressor system is crucial for identifying any abnormalities or deviations from the desired operating parameters. Most oil-free compressors have built-in pressure and temperature sensors that provide real-time data. Regularly checking and recording this data can help detect any potential issues, such as pressure drops, abnormal temperature increases, or excessive cycling. If any abnormalities are detected, they should be investigated and addressed promptly to prevent further damage to the compressor.

5. General System Checks:

Performing general system checks on a regular basis helps ensure that all components of the oil-free air compressor are functioning properly. This includes inspecting the compressor motor, cooling fans, belts, and electrical connections. Any signs of wear, damage, or abnormal noise should be addressed promptly. Additionally, checking the compressor for any signs of oil contamination or unusual odors can help identify potential issues with the compressor system.

6. Manufacturer’s Recommendations:

It’s essential to follow the manufacturer’s recommended maintenance schedule and guidelines for the specific oil-free air compressor model. The manufacturer’s recommendations may include additional maintenance tasks specific to the compressor’s design and components. Adhering to these guidelines ensures that the compressor is properly maintained and can help prevent warranty issues.

Regular and proactive maintenance of oil-free air compressors is essential to ensure their reliable and efficient operation. Following the recommended maintenance tasks, monitoring system parameters, and promptly addressing any issues that arise can help extend the compressor’s lifespan, reduce the risk of breakdowns, and maintain the desired air quality for the intended applications.

air compressor

What Are the Key Components of an Oil-Free Compressor System?

An oil-free compressor system consists of several key components that work together to compress air without the use of oil. Here’s a detailed explanation of the main components:

1. Air Intake:

The air intake is the entry point where ambient air is drawn into the compressor system. It typically includes a filter to prevent dust, debris, and other contaminants from entering the compressor and ensures clean air for compression.

2. Air Compressor Unit:

The air compressor unit is the core component responsible for compressing the incoming air. In an oil-free compressor system, this unit is designed to operate without the need for lubricating oil. It generally consists of one or more compression stages, each comprising a cylinder, piston, valves, and seals. The compression process raises the pressure of the air, resulting in compressed air output.

3. Compression Cooling System:

During the compression process, the air temperature increases significantly. To prevent overheating and ensure efficient operation, oil-free compressor systems employ cooling systems. These cooling systems can include air cooling or water cooling mechanisms, which help dissipate the heat generated during compression and maintain optimal operating temperatures.

4. Air/Oil Separation System:

An oil-free compressor system employs an air/oil separation system to ensure that no oil is carried over into the compressed air. This system typically consists of specialized filters or separators that remove any residual oil or oil mist from the compressed air before it leaves the compressor system. This separation process ensures that the compressed air remains oil-free.

5. Control and Monitoring Systems:

Modern oil-free compressor systems are equipped with advanced control and monitoring systems. These systems enable precise control of various parameters, such as pressure, temperature, and compressor speed. They also provide real-time monitoring of performance, efficiency, and potential issues. Control and monitoring systems allow for optimized operation, energy efficiency, and proactive maintenance.

6. Air Receiver Tank:

An air receiver tank, also known as a compressed air storage tank, is often included in oil-free compressor systems. The tank serves as a storage reservoir for the compressed air, providing a buffer to meet fluctuating air demand. It helps stabilize the pressure, reduces pressure fluctuations, and allows for more efficient usage of the compressed air in downstream applications.

7. Air Treatment Components:

Depending on the specific application requirements, oil-free compressor systems may include additional air treatment components. These components can include filters, dryers, and condensate management systems. Filters remove particulates and contaminants from the compressed air, while dryers remove moisture to ensure the production of clean, dry, and high-quality compressed air. Condensate management systems handle the separation and disposal of liquid condensate produced during the compression process.

8. Piping and Distribution System:

The piping and distribution system transports the compressed air from the compressor unit to the desired application points. It includes pipes, fittings, valves, and connectors that ensure proper airflow and distribution of the compressed air throughout the system. The piping system should be designed and sized appropriately to minimize pressure drops and optimize efficiency.

These are the fundamental components found in oil-free compressor systems. However, it’s important to note that the specific configuration and additional components may vary depending on the design, capacity, and intended application of the compressor system.

air compressor

How Do Oil-Free Air Compressors Compare to Oil-Lubricated Ones?

When comparing oil-free air compressors to oil-lubricated ones, several factors come into play, including performance, maintenance requirements, air quality, and application suitability. Here’s a detailed comparison between oil-free air compressors and oil-lubricated ones:

1. Oil Contamination:

Oil-lubricated compressors require oil for lubrication and cooling of internal components. However, there is a risk of oil carryover, where small amounts of oil can mix with the compressed air. This oil contamination can have adverse effects on downstream equipment, processes, and end products. In contrast, oil-free air compressors eliminate the risk of oil contamination as they operate without lubricating oil. This makes them suitable for applications that require clean and oil-free compressed air, such as in the food and beverage, pharmaceutical, and electronics industries.

2. Compressed Air Quality:

Oil-lubricated compressors may introduce oil aerosols, vapors, or particles into the compressed air stream. While filters and separators can help mitigate oil contamination, achieving completely oil-free compressed air may be challenging. In contrast, oil-free air compressors deliver clean and dry compressed air without any oil content. They are designed to meet strict air quality standards, such as ISO 8573-1 Class 0, ensuring the highest level of air purity. This makes them ideal for applications where air quality is critical, such as in pharmaceutical manufacturing, research laboratories, and electronics assembly.

3. Maintenance Requirements:

Oil-lubricated compressors require regular maintenance to ensure proper lubrication, filter replacement, and oil changes. The presence of oil also necessitates careful monitoring of oil levels and potential leaks. Maintenance tasks can be more involved and time-consuming compared to oil-free compressors. On the other hand, oil-free air compressors generally have lower maintenance requirements since they don’t require oil changes or oil-related maintenance. However, regular maintenance tasks such as filter replacements and general system checks are still necessary to maintain optimal performance and reliability.

4. Initial Cost and Energy Efficiency:

Oil-lubricated compressors typically have a lower initial cost compared to oil-free compressors. However, oil-free compressors can offer long-term cost savings due to reduced maintenance requirements and lower energy consumption. Oil-lubricated compressors use oil for lubrication, which adds to the energy consumption as the compressor needs to overcome the friction generated by the oil. In contrast, oil-free compressors eliminate the need for oil, resulting in higher energy efficiency and potential energy savings over the compressor’s lifespan.

5. Application Suitability:

The choice between oil-free and oil-lubricated compressors depends on the specific application requirements. Oil-lubricated compressors are often suitable for general industrial applications where compressed air quality is not critical, and oil carryover is acceptable. They are commonly used in manufacturing, construction, and automotive industries. On the other hand, oil-free compressors are essential for applications that demand clean and oil-free compressed air, such as in food processing, pharmaceutical production, electronics manufacturing, and critical research environments.

It’s important to consider the specific needs of the application, industry regulations, and the desired level of compressed air purity when choosing between oil-free and oil-lubricated compressors. Consulting with compressed air experts and considering factors such as air quality requirements, maintenance costs, and long-term energy efficiency can help determine the most suitable compressor type for a particular application.

China high quality 7.5kw 15kw 22kw Screw Air Compressor High Pressure Air Compressor AC Air Compressor Direct Driven Air Compressor Oilless Oil Free Air Compressor   portable air compressorChina high quality 7.5kw 15kw 22kw Screw Air Compressor High Pressure Air Compressor AC Air Compressor Direct Driven Air Compressor Oilless Oil Free Air Compressor   portable air compressor
editor by CX 2024-03-27

Recent Posts