China wholesaler China Custom Made Screw Air Compressor 37kw 50HP Double Stage Low Pressure Screw Air Compressor Oil Free arb air compressor

Product Description

Product Parameters

Model Motor Power Maximum Working Pressure Free Air Delivery Air Outlet Pipe Diameter Weight Dimensions(L*W*H)
kW hp bar(g) psig m³/min cfm kg mm
BG50APMII 37 50 4 58 10.3  364 G2″ 1600 2100*1300*1650
5 73 9.5  335
BG60APMII 45 60 4 58 12.2  431 G2″ 1650 2100*1300*1650
5 73 11.5  406
BG75APMII 55 75 4 58 15.5  547 G2″ 1700 2100*1300*1650
5 73 14.5  512
BG100APMII 75 100 4 58 19.5  689 DN80 2700 2500*1650*1900
5 73 19.0  671
BG125APMII 90 125 4 58 24.5  865 DN80 2800 2500*1650*1900
5 73 23.0  812
BG150APMII 110 150 4 58 28.0  989 DN80 2900 2500*1650*1900
5 73 27.5  971
BG180APMII 132 180 4 58 36.0  1271 DN100 3100 3000*1900*1950
5 73 34.0  1201
BG220APMII 160 220 4 58 46.0  1624 DN100 4400 3000*1900*1950
5 73 42.0  1483
BG250APMII 185 250 4 58 52.0  1836 DN125 5500 3600*2200*2200
5 73 45.0  1589
BG270APMII 200 270 4 58 57.0  2013 DN125 6000 3600*2200*2200
5 73 51.5  1819
BG300APMII 220 300 4 58 62.0  2190 DN150 6800 4000*2300*2300
5 73 55.0  1942
BG340APMII 250 340 4 58 65.0  2295 DN150 7500 4000*2300*2300
5 73 61.0  2154

Wallboge is a high-tech enterprise and is considered 1 of the leading manufacturers of air compressor products in China. Our goal is to provide exceptional customer service coupled with quality products and energy saving solutions.

Wallboge’ s primary businesses focus in following key areas:

Integrated screw air compressor for laser cutting
Permanent magnet variable frequency screw air compressor
Two-stage compression permanent magnet variable frequency screw air compressor
Low pressure two-stage compression permanent magnet variable frequency screw air compressor
Low pressure permanent magnet variable frequency screw air compressor
Water-lubricated oil-free screw air compressor
Fixed speed screw air compressor
Oil-free screw blower
Screw vacuum pump

At Wallboge, we earn our customers’ trust and satisfaction by manufacturing the superior quality compressed air products for all industries. All of our products are designed for reliable performance, easy maintenance, and maximum energy efficiency. CHINAMFG has been exporting to more than 150 countries across the globe. 

Wallboge continuously innovates product development and management to meet customers’ demand. The powerful enterprise culture and continuous innovation make CHINAMFG improved rapidly. Wallboge’ s vision is to be a world-renowned high-end energy-saving machinery brand, with sustainable development, constantly improving its own value and sharing it with our customers and staff, committed to continuously satisfying the needs of global companies by providing a full range of industrial air compression solutions.




After Sales Service

1. 24/7 after sales service in different languages.
2. Online instruction for installation and commissioning.
3. On-site instruction for installation and commissioning provided by well-trained engineers or local authorized service center.
4. CHINAMFG agents and after sales service available.

Our Advantages

1. Proven product quality.
2. Factory direct prices.
3. On-time delivery.
4. Prompt technical support in different languages before sales, in sales and after sales.
5. Small orders accepted to check quality first.
6. OEM & ODM service available.



Q1: Are you a factory or a trading company? 
A1: We are a factory. Please check our Company Profile.

Q2: What is the exact address of your factory? 
A2: No. 588, East Tonggang Road, Shaxi Town, HangZhou City, ZheJiang Province, China

Q3: What is your delivery time?
A3: For standard voltage, the delivery time is 15 working days after you confirm the order. For non-standard voltage, please contact our sales to confirm the delivery time.

Q4: What kind of payment terms do you accept?
A4: We accept T/T, L/C at sight.

Q5: How long is the warranty of your air compressor?
A5: 2 years for the whole air compressor except consumable spare parts.

Q6: How long could your air compressor be used?
A6: Generally, more than 10 years.

Q7: What is your MOQ requirement?
A7: 1 unit.

Q8: Can you offer OEM & ODM service?
A8: Yes, with a professional design team, we can offer OEM & ODM service.

Shipping Cost:

Estimated freight per unit.

To be negotiated
After-sales Service: Engineers Available to Overseas Service.
Warranty: 2 Years
Lubrication Style: Lubricated


air compressor

Are There Specific Filtration Requirements for Oil-Free Compressors?

Yes, oil-free compressors have specific filtration requirements to ensure the quality and purity of the compressed air output. These filtration requirements are designed to address the unique characteristics of oil-free compressors and the potential contaminants that can be present in the intake air. Here’s a detailed explanation of the specific filtration requirements for oil-free compressors:

1. Pre-Filtration:

Pre-filtration is the first stage of filtration in oil-free compressors and is designed to remove larger particles, such as dust, dirt, and debris, from the intake air. These particles can enter the compressor and cause damage to internal components or affect the performance of downstream filtration stages. Pre-filters typically consist of pleated or mesh filters that capture particles of various sizes. The efficiency of pre-filters is usually specified in terms of their particle size removal capability, such as 5 microns or 10 microns.

2. Coalescing Filtration:

The coalescing filtration stage in oil-free compressors is responsible for removing smaller particles and coalescing water vapor into droplets for subsequent removal. This stage is crucial in ensuring that the compressed air remains free from fine particles and moisture, which can cause contamination and corrosion issues. Coalescing filters are designed with special media that capture and combine small particles and water droplets, allowing them to be easily separated from the compressed air. The efficiency of coalescing filters is typically specified in terms of their particulate removal capability and moisture removal efficiency, such as 0.01 microns and 99.9% respectively.

3. Activated Carbon Filtration:

Activated carbon filtration is often employed as a final stage in the filtration process of oil-free compressors. Activated carbon filters help eliminate odors and absorb any remaining oil vapors or hydrocarbons that might have bypassed the previous filtration stages. These filters contain activated carbon granules with a high surface area, allowing them to adsorb and trap odor-causing compounds and trace amounts of oil vapor. The efficiency of activated carbon filters is typically specified based on their odor removal capacity and oil vapor adsorption capacity.

It’s important to note that the specific filtration requirements for oil-free compressors may vary depending on the application and the desired air quality standards. Industries such as food and beverage, pharmaceuticals, electronics manufacturing, and painting often have more stringent filtration requirements to meet their specific air purity needs. In such cases, additional filtration stages, such as sterile filters or high-efficiency particulate air (HEPA) filters, may be incorporated to achieve the desired level of air quality.

Complying with industry standards and guidelines, such as ISO 8573, can provide guidance on the appropriate filtration requirements for oil-free compressors. These standards define specific limits for contaminants in compressed air, including oil content, particulate matter, and moisture, and can help determine the necessary filtration stages and their efficiency ratings.

By implementing the appropriate filtration requirements, oil-free compressors can ensure that the compressed air produced is clean, dry, and free from contaminants, meeting the specific air quality needs of various applications.

air compressor

Are There Any Specific Safety Considerations When Using Oil-Free Compressors?

Yes, there are specific safety considerations that should be taken into account when using oil-free compressors. Here’s a detailed explanation of the safety considerations associated with oil-free compressor operation:

1. Electrical Safety:

Oil-free compressors are powered by electricity, so electrical safety measures should be followed. It is important to ensure that the compressor is properly grounded and connected to a suitable power source. Electrical wiring and connections should be inspected regularly to identify any potential hazards such as frayed wires or loose connections. Adequate circuit protection, such as fuses or circuit breakers, should be in place to prevent overloads or short circuits. All electrical work should be performed by qualified personnel in compliance with applicable electrical codes and regulations.

2. Pressure Safety:

Compressed air generated by oil-free compressors can reach high pressures, and proper pressure safety measures should be in place. Pressure relief valves are essential components that protect the compressor and the entire compressed air system from overpressurization. These valves should be properly sized, regularly inspected, and tested to ensure they operate within the specified pressure limits. Pressure gauges should be installed to monitor and display the pressure levels accurately. It is important to avoid exceeding the maximum pressure rating of the compressor and to follow the manufacturer’s guidelines regarding pressure limitations.

3. System Ventilation:

Oil-free compressors generate heat during operation, and adequate ventilation is necessary to prevent overheating. Sufficient airflow around the compressor unit should be maintained to dissipate heat effectively. The compressor should be installed in a well-ventilated area, and any obstructions that could restrict airflow should be avoided. Inadequate ventilation can lead to increased operating temperatures, reduced compressor performance, and potential safety hazards. Manufacturers’ recommendations regarding ventilation requirements should be followed.

4. Preventing Injuries:

When working with oil-free compressors, certain precautions can help prevent injuries. It is important to wear appropriate personal protective equipment (PPE), such as safety glasses, hearing protection, and gloves, when operating or maintaining the compressor. Loose clothing, jewelry, or other items that could get caught in moving parts should be avoided. Compressed air should never be directed towards the body or other individuals, as it can cause serious injuries, such as cuts, bruises, or even pneumothorax. Proper training and clear instructions for safe operation should be provided to all personnel working with the compressor.

5. Maintenance and Inspection:

Regular maintenance and inspection of oil-free compressors are essential for safe operation. The compressor should be inspected for any signs of damage, leaks, or abnormal vibrations. Routine maintenance tasks, such as filter replacements, should be performed according to the manufacturer’s recommendations. Maintenance procedures should be carried out with the compressor turned off and isolated from the power source. Only authorized personnel with the necessary training and knowledge should perform maintenance tasks on the compressor to ensure proper safety protocols are followed.

6. Emergency Preparedness:

Being prepared for potential emergencies is crucial when using oil-free compressors. Emergency shutdown procedures should be established and clearly communicated to all personnel. Adequate fire suppression equipment, such as fire extinguishers, should be readily available and properly maintained. In the event of a compressor-related incident, personnel should be trained on emergency response protocols and evacuation procedures.

It is important to consult the manufacturer’s documentation and guidelines for specific safety considerations related to the oil-free compressor model being used. Additionally, adherence to relevant safety regulations and standards, as well as regular safety training and awareness programs, further contribute to maintaining a safe working environment when using oil-free compressors.

air compressor

How Does an Oil-Free Air Compressor Work?

An oil-free air compressor, also known as an oilless air compressor, operates using alternative methods to achieve compression without the need for lubricating oil. These compressors employ various techniques to deliver clean, oil-free compressed air. Here’s a detailed explanation of how an oil-free air compressor works:

1. Dry Compression:

In oil-free air compressors, the compression chamber is designed to operate without any oil present. The compression process starts with the intake stroke, where ambient air is drawn into the compressor through an inlet valve. The air is then compressed in the compression chamber without any oil lubrication.

2. Friction Reduction:

Since there is no oil in the compression chamber, special measures are taken to reduce friction and wear between the moving parts. These measures include the use of specialized materials, coatings, and surface treatments on the compressor components. These friction-reducing techniques minimize the need for lubrication and allow for efficient compression.

3. Piston Rings and Seals:

Oil-free compressors utilize advanced piston rings and seals to provide effective sealing without the need for oil lubrication. These rings and seals are designed to reduce internal leakage and ensure efficient compression. They help maintain the compression efficiency by minimizing air leakage during the compression process.

4. Cooling Mechanisms:

Oil-free air compressors often incorporate cooling mechanisms to dissipate the heat generated during compression. This helps prevent overheating and ensures the compressor operates within acceptable temperature limits. Common cooling methods include water cooling and air cooling. Water-cooled compressors use a water jacket or a separate cooling circuit to remove heat, while air-cooled compressors rely on fans and heat sinks to cool the compressor.

5. Filtration:

Oil-free compressors typically incorporate effective air filtration systems to remove contaminants, such as dust, particles, and moisture, from the intake air. These filtration systems ensure that the compressed air produced is clean and free from impurities. Depending on the application, additional filtration equipment, such as coalescing filters or activated carbon filters, may be employed to achieve specific air quality requirements.

6. Control and Safety Systems:

Oil-free air compressors are equipped with control and safety systems to monitor and regulate the compressor’s operation. These systems can include pressure switches, temperature sensors, safety valves, and control panels. They help maintain optimal operating conditions, protect the compressor from excessive pressures or temperatures, and provide safety features to prevent damage or accidents.

By employing these techniques and components, oil-free air compressors achieve compression without the need for lubricating oil. This results in clean, oil-free compressed air that is suitable for applications where oil contamination could be problematic, such as in industries like food processing, pharmaceuticals, electronics, and painting.

It’s important to note that the specific design and operation of oil-free air compressors may vary depending on the manufacturer and model. Therefore, it’s recommended to consult the manufacturer’s documentation and guidelines for detailed information on how a particular oil-free compressor works.

China wholesaler China Custom Made Screw Air Compressor 37kw 50HP Double Stage Low Pressure Screw Air Compressor Oil Free   arb air compressorChina wholesaler China Custom Made Screw Air Compressor 37kw 50HP Double Stage Low Pressure Screw Air Compressor Oil Free   arb air compressor
editor by CX 2023-10-07

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