China Good quality High Reliability Low Pressure Screw Air Compressors for Water Treatment best air compressor

Product Description

Intelligent Control Low Pressure Screw Air Compressor Advantages 

1. It will cause a terrible waste of electric power if choose a routine 7bar air compressor when the maximum working pressure is 2 to 5bar. CHINAMFG low pressure screw air compressor can enlarge the air delivery under the same motor power to help you save 20% to 50% electric power. 

2. State-of-the-art screw element, original Germany CHINAMFG air end, ladvanced SAP profile design, superior Sweden SKF element bearings

3. Adopts world-renowned components, such as Schneider electronics from
France, Mann filters from Germany, CHINAMFG pressure sensor from
Denmark, etc. Contribute to guarantee the compressor longer service life. 

4. Conform to CE, ISO9001 and energy saving certification, etc. 

5. Designed especially for textile, cement and glass industry, etc. 

Technical Parameters Of The Low Pressure Screw Air Compressor 


Model Maxinmum working  pressure Capacity(FAD)* Installed motor power driving mode& Cooling method Dimensions
Weight Noise level** Air
pipe diameter
50 HZ 60 HZ
bar(e) psig Min. Max. Min. Max. Min. Max. Min. Max. kw hp L W H kg dB(A)
m³/min cfm m³/min cfm
DVAL-55-3 3 43.5 8.39 16.78 296 592 7.46 14.92 264 527 55 75 Direct Driven  Air   Cooling /W-Water Cooling 2950 1800 2300 1800 70 DN50
DVAL-75-3 11.55 23.1 408 816 12.22 24.44 432 863 75 100 2950 1800 2300 1900 70 DN80
DVAL-90-3 12.78 25.57 452 903 13.85 27.71 489 978 90 120 2950 1800 2300 2500 74 DN80
DVAL-110-3 16 31.99 565 1130 14.12 28.25 499 997 110 150 3700 2300 2450 3700 74 DN80
DVAL-132-3 17.89 35.77 632 1263 15.36 30.71 542 1084 132 175 3700 2300 2450 4000 74 DN80
DVAL-160-3 19.51 39.02 689 1378 17.55 35.09 620 1239 160 215 3700 2300 2450 4500 77 DN80
DVAL-185(W)-3 21.76 43.51 768 1536 22.58 45.15 797 1594 185 250 3700 2300 2450 5200 77 DN100
DVAL-250(W)-3 31.5 63 1113 2225 34.65 69.3 1224 2447 250 350 4300 2400 2350 6800 82 DN100

*) FAD in accordance with ISO 1217 : 2009, Annex C: Absolute intake pressure 1 bar (a), cooling and air intake temperature 20 °C
**) Noise level as per ISO 2151 and the basic standard ISO 9614-2, operation at maximum operating pressure and maximum speed; tolerance: ± 3 dB(A)

DENAIR Certificates

DENAIR Factory

DENAIR Hannover Messe 2017 

We carefully selected for you the classic case

DENAIR Air Compressor in Russian Car Factory 

Project Name: Russian car factory. 

Product Name and Model: Screw air compressors DVA-250 *1, DA-250 *3, DA-90 *1, DVA-90 *1. Refrigerant air dryer DAD-50HTF *1, DAD-15HTF *1. Adsorption dryer DAD-60MXF*1. 

Working time: From June, 2016 till now. 

Event: DENAIR produced special compressor equipment for car factory in Russia. All compressors can be controlled by 1 computer using Metacentre control system. 

In the factory will be produce Chinese brand cars. We try our best to make observation “Made in China ” associate not with cheap price, but with high quality, innovation and grate stability.  


Q1: Are you factory or trade company? 
A1: We are factory. 

Q2: What the exactly address of your factory? 
A2: Our company is located in No. 6767, Tingfeng Rd. Xihu (West Lake) Dis.n District, ZheJiang  201502, China
And our factory is located in No. 366, YangzhuangBang Street, Pingxing Rd., Xindai Town, HangZhou, ZHangZhoug Province, China

Q3: Warranty terms of your machine? 
A3: Two years warranty for the machine and technical support according to your needs. 

Q4: Will you provide some spare parts of the machines? 
A4: Yes, of course. 

Q5: How long will you take to arrange production? 
A5: 380V 50Hz we can delivery the goods within 10 days. Other electricity or other color we will delivery within 22 days

Q6: Can you accept OEM orders? 
A6: Yes, with professional design team, OEM orders are highly welcome. 

Lubrication Style: Lubricated
Cooling System: Air Cooling
Power Source: AC Power


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

air compressor

What is the impact of humidity on compressed air quality?

Humidity can have a significant impact on the quality of compressed air. Compressed air systems often draw in ambient air, which contains moisture in the form of water vapor. When this air is compressed, the moisture becomes concentrated, leading to potential issues in the compressed air. Here’s an overview of the impact of humidity on compressed air quality:

1. Corrosion:

High humidity in compressed air can contribute to corrosion within the compressed air system. The moisture in the air can react with metal surfaces, leading to rust and corrosion in pipes, tanks, valves, and other components. Corrosion not only weakens the structural integrity of the system but also introduces contaminants into the compressed air, compromising its quality and potentially damaging downstream equipment.

2. Contaminant Carryover:

Humidity in compressed air can cause carryover of contaminants. Water droplets formed due to condensation can carry particulates, oil, and other impurities present in the air. These contaminants can then be transported along with the compressed air, leading to fouling of filters, clogging of pipelines, and potential damage to pneumatic tools, machinery, and processes.

3. Decreased Efficiency of Pneumatic Systems:

Excessive moisture in compressed air can reduce the efficiency of pneumatic systems. Water droplets can obstruct or block the flow of air, leading to decreased performance of pneumatic tools and equipment. Moisture can also cause problems in control valves, actuators, and other pneumatic devices, affecting their responsiveness and accuracy.

4. Product Contamination:

In industries where compressed air comes into direct contact with products or processes, high humidity can result in product contamination. Moisture in compressed air can mix with sensitive products, leading to quality issues, spoilage, or even health hazards in industries such as food and beverage, pharmaceuticals, and electronics manufacturing.

5. Increased Maintenance Requirements:

Humidity in compressed air can increase the maintenance requirements of a compressed air system. Moisture can accumulate in filters, separators, and other air treatment components, necessitating frequent replacement or cleaning. Excessive moisture can also lead to the growth of bacteria, fungus, and mold within the system, requiring additional cleaning and maintenance efforts.

6. Adverse Effects on Instrumentation:

Humidity can adversely affect instrumentation and control systems that rely on compressed air. Moisture can disrupt the accuracy and reliability of pressure sensors, flow meters, and other pneumatic instruments, leading to incorrect measurements and control signals.

To mitigate the impact of humidity on compressed air quality, various air treatment equipment is employed, including air dryers, moisture separators, and filters. These devices help remove moisture from the compressed air, ensuring that the air supplied is dry and of high quality for the intended applications.

air compressor

What is the impact of altitude on air compressor performance?

The altitude at which an air compressor operates can have a significant impact on its performance. Here are the key factors affected by altitude:

1. Decreased Air Density:

As altitude increases, the air density decreases. This means there is less oxygen available per unit volume of air. Since air compressors rely on the intake of atmospheric air for compression, the reduced air density at higher altitudes can lead to a decrease in compressor performance.

2. Reduced Airflow:

The decrease in air density at higher altitudes results in reduced airflow. This can affect the cooling capacity of the compressor, as lower airflow hampers the dissipation of heat generated during compression. Inadequate cooling can lead to increased operating temperatures and potential overheating of the compressor.

3. Decreased Power Output:

Lower air density at higher altitudes also affects the power output of the compressor. The reduced oxygen content in the air can result in incomplete combustion, leading to decreased power generation. As a result, the compressor may deliver lower airflow and pressure than its rated capacity.

4. Extended Compression Cycle:

At higher altitudes, the air compressor needs to work harder to compress the thinner air. This can lead to an extended compression cycle, as the compressor may require more time to reach the desired pressure levels. The longer compression cycle can affect the overall efficiency and productivity of the compressor.

5. Pressure Adjustments:

When operating an air compressor at higher altitudes, it may be necessary to adjust the pressure settings. As the ambient air pressure decreases with altitude, the compressor’s pressure gauge may need to be recalibrated to maintain the desired pressure output. Failing to make these adjustments can result in underinflated tires, improper tool performance, or other issues.

6. Compressor Design:

Some air compressors are specifically designed to handle higher altitudes. These models may incorporate features such as larger intake filters, more robust cooling systems, and adjusted compression ratios to compensate for the reduced air density and maintain optimal performance.

7. Maintenance Considerations:

Operating an air compressor at higher altitudes may require additional maintenance and monitoring. It is important to regularly check and clean the intake filters to ensure proper airflow. Monitoring the compressor’s operating temperature and making any necessary adjustments or repairs is also crucial to prevent overheating and maintain efficient performance.

When using an air compressor at higher altitudes, it is advisable to consult the manufacturer’s guidelines and recommendations specific to altitude operations. Following these guidelines and considering the impact of altitude on air compressor performance will help ensure safe and efficient operation.

air compressor

What are the safety considerations when operating an air compressor?

Operating an air compressor requires careful attention to safety to prevent accidents, injuries, and equipment damage. Here are some important safety considerations to keep in mind:

1. Read the Manual: Before operating an air compressor, thoroughly read and understand the manufacturer’s instruction manual. Familiarize yourself with the specific safety guidelines, recommended operating procedures, and any specific precautions or warnings provided by the manufacturer.

2. Proper Ventilation: Ensure that the area where the air compressor is operated has adequate ventilation. Compressed air can produce high levels of heat and exhaust gases. Good ventilation helps dissipate heat, prevent the buildup of fumes, and maintain a safe working environment.

3. Personal Protective Equipment (PPE): Always wear appropriate personal protective equipment, including safety glasses or goggles, hearing protection, and non-slip footwear. Depending on the task, additional PPE such as gloves, a dust mask, or a face shield may be necessary to protect against specific hazards.

4. Pressure Relief: Air compressors should be equipped with pressure relief valves or devices to prevent overpressurization. Ensure that these safety features are in place and functioning correctly. Regularly inspect and test the pressure relief mechanism to ensure its effectiveness.

5. Secure Connections: Use proper fittings, hoses, and couplings to ensure secure connections between the air compressor, air tools, and accessories. Inspect all connections before operation to avoid leaks or sudden hose disconnections, which can cause injuries or damage.

6. Inspect and Maintain: Regularly inspect the air compressor for any signs of damage, wear, or leaks. Ensure that all components, including hoses, fittings, and safety devices, are in good working condition. Follow the manufacturer’s recommended maintenance schedule to keep the compressor in optimal shape.

7. Electrical Safety: If the air compressor is electric-powered, take appropriate electrical safety precautions. Use grounded outlets and avoid using extension cords unless approved for the compressor’s power requirements. Protect electrical connections from moisture and avoid operating the compressor in wet or damp environments.

8. Safe Start-Up and Shut-Down: Properly start and shut down the air compressor following the manufacturer’s instructions. Ensure that all air valves are closed before starting the compressor and release all pressure before performing maintenance or repairs.

9. Training and Competence: Ensure that operators are adequately trained and competent in using the air compressor and associated tools. Provide training on safe operating procedures, hazard identification, and emergency response protocols.

10. Emergency Preparedness: Have a clear understanding of emergency procedures and how to respond to potential accidents or malfunctions. Know the location of emergency shut-off valves, fire extinguishers, and first aid kits.

By adhering to these safety considerations and implementing proper safety practices, the risk of accidents and injuries associated with operating an air compressor can be significantly reduced. Prioritizing safety promotes a secure and productive working environment.

China Good quality High Reliability Low Pressure Screw Air Compressors for Water Treatment   best air compressorChina Good quality High Reliability Low Pressure Screw Air Compressors for Water Treatment   best air compressor
editor by CX 2023-11-07