China Hot selling High Efficiency Variable Speed 37kw 50HP Two Stage Screw Air Compressor for Industrial 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
BG30APMII 22 30 7 102 4.3 152 G1-1/2″ 650 1500*1000*1350
8 116 4.1  145
10 145 3.5  124
13 189 2.7  95
BG40APMII 30 40 7 102 6.0  212 G1-1/2″ 700 1500*1000*1350
8 116 5.9  208
10 145 4.7  166
13 189 3.9  138
BG50APMII 37 50 7 102 7.1  251 G1-1/2″ 750 1500*1000*1350
8 116 6.9  244
10 145 5.8  205
13 189 5.4  191
BG60APMII 45 60 7 102 10.0  353 G2″ 1250 2100*1300*1650
8 116 9.5  335
10 145 7.8  275
13 189 6.8  240
BG75APMII 55 75 7 102 13.0  459 G2″ 1300 2100*1300*1650
8 116 12.5  441
10 145 9.2  325
13 189 7.5  265
BG100APMII 75 100 7 102 15.5  547 G2″ 1350 2100*1300*1650
8 116 15.2  537
10 145 12.0  424
13 189 10.2  360
BG125APMII 90 125 7 102 19.8  699 DN80 2700 2500*1650*1900
8 116 19.5  689
10 145 15.0  530
13 189 14.0  494
BG150APMII 110 150 7 102 24.0  848 DN80 2800 2500*1650*1900
8 116 23.0  812
10 145 19.2  678
13 189 16.0  565
BG180APMII 132 180 7 102 27.5  971 DN80 3000 2500*1650*1900
8 116 27.0  954
10 145 23.7  837
13 189 19.0  671
BG220APMII 160 220 7 102 33.0  1165 DN80 4300 3000*1900*1950
8 116 32.5  1148
10 145 27.5  971
13 189 22.5  795
BG250APMII 185 250 7 102 39.0  1377 DN80 4400 3000*1900*1950
8 116 36.0  1271
10 145 32.0  1130
13 189 27.5  971
BG270APMII 200 270 7 102 43.5  1536 DN80 5000 3600*2200*2200
8 116 41.0  1448
10 145 35.5  1254
13 189 31.5  1112
BG300APMII 220 300 7 102 51.5  1819 DN100 5500 3600*2200*2200
8 116 46.0  1624
10 145 38.5  1360
13 189 35.5  1254
BG340APMII 250 340 7 102 54.0  1907 DN100 6000 3600*2200*2200
8 116 51.0  1801
10 145 45.0  1589
13 189 38.0  1342
BG380APMII 280 380 7 102 60.0  2119 DN125 6800 4000*2300*2300
8 116 57.0  2013
10 145 50.0  1766
13 189 43.0  1519
BG420APMII 315 420 7 102 65.0  2295 DN125 7000 4000*2300*2300
8 116 62.0  2190
10 145 56.0  1978
13 189 50.5  1783
BG480APMII 355 480 7 102 75.0  2649 DN150 8500 4200*2200*2350
8 116 73.0  2578
10 145 64.0  2260
13 189 55.0  1942
BG540APMII 400 540 7 102 84.0  2966 DN150 9000 4200*2200*2350
8 116 82.0  2896
10 145 72.0  2543
13 189 61.0  2154

Company Profile

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. 

CHINAMFG 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.

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


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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

How Does Variable Speed Control Work in Screw Compressors?

Variable speed control in screw compressors is a technology that allows the compressor’s rotational speed to be adjusted according to the compressed air or gas demand. This control method offers several benefits in terms of energy efficiency and system performance. Here’s a detailed explanation:

Variable speed control, also known as variable frequency drive (VFD) or inverter control, works by adjusting the speed of the compressor’s drive motor. The drive motor is typically an electric motor that powers the rotation of the compressor’s screw rotors.

The key components and operation of variable speed control in screw compressors are as follows:

  • 1. Drive Motor: The drive motor is connected to the compressor’s screw rotors and provides the rotational power required for compression. It is an electric motor capable of operating at variable speeds.
  • 2. Inverter or Variable Frequency Drive (VFD): The inverter or VFD is an electronic device that controls the speed of the drive motor. It converts the incoming electrical power into adjustable frequency and voltage, allowing precise control of the motor’s rotational speed.
  • 3. Control System: The control system of the screw compressor monitors and adjusts the speed of the drive motor based on the compressed air or gas demand. It receives input signals from sensors that measure parameters such as pressure, flow rate, or system demand, and sends corresponding signals to the inverter or VFD to regulate the motor speed.
  • 4. Speed Adjustment: When the demand for compressed air or gas decreases, the control system reduces the motor speed by decreasing the frequency and voltage supplied by the inverter or VFD. This results in a lower rotational speed of the screw rotors, reducing the compression capacity and power consumption of the compressor.
  • 5. Energy Efficiency: Variable speed control allows the compressor to match the output to the actual demand, avoiding energy wastage associated with constant-speed compressors. By operating at lower speeds during periods of lower demand, energy consumption can be significantly reduced. This energy-saving capability is particularly advantageous in applications with varying air or gas requirements.
  • 6. Smooth Operation: Variable speed control enables smooth and gradual motor acceleration and deceleration, minimizing mechanical stress on the compressor components and reducing the likelihood of sudden pressure surges or system shutdowns.
  • 7. System Stability: By adjusting the compressor’s speed to match the demand, variable speed control helps maintain stable system pressure and prevents excessive cycling of the compressor. This contributes to improved system performance and longevity.

It’s worth noting that variable speed control is more commonly found in larger screw compressors used in industrial and commercial applications. Smaller screw compressors may utilize fixed-speed motors due to cost considerations or simpler system requirements.

Overall, variable speed control in screw compressors offers precise capacity modulation, improved energy efficiency, enhanced system stability, and reduced maintenance requirements, making it a preferred choice in many applications where compressed air or gas demand fluctuates.

air compressor

Can Screw Compressors Be Used for Medical Air Supply?

Yes, screw compressors can be used for medical air supply. Here’s a detailed explanation:

Screw compressors are commonly employed in various applications, including medical air supply systems. Medical air is a critical utility in healthcare facilities, used for various purposes such as respiratory therapy, anesthesia, and surgical tools. Here are some key points to consider:

1. Reliability and Efficiency:

Screw compressors are known for their reliability and efficiency. They can provide a continuous and reliable source of compressed air, ensuring a stable supply for medical applications. The rotary screw design allows for smooth and efficient compression, minimizing energy consumption and maximizing system performance.

2. Oil-Free Operation:

In medical applications, it is crucial to ensure the purity of the compressed air. Screw compressors can be designed and certified to provide oil-free air, eliminating the risk of oil contamination in the medical air supply. Oil-free screw compressors incorporate specialized sealing systems and filtration to prevent oil carryover, making them suitable for medical air applications.

3. Air Quality Standards:

Medical air must meet specific air quality standards to ensure patient safety and treatment effectiveness. Standards such as the European Pharmacopoeia (Ph. Eur.) or the United States Pharmacopeia (USP) define the required purity levels for medical air, including limits on particulate matter, moisture content, and microbial contamination. Screw compressors can be equipped with appropriate filtration and purification systems to meet these standards.

4. Integrated Drying and Filtration:

Some screw compressors designed for medical air applications incorporate integrated drying and filtration systems. These systems remove moisture and contaminants from the compressed air, ensuring it meets the required quality standards. Integrated drying systems can include refrigerated dryers, desiccant dryers, or membrane dryers, depending on the specific needs of the medical air supply system.

5. Redundancy and Backup Systems:

Medical air supply systems often require a high level of reliability and continuity. Screw compressors can be configured with redundancy and backup systems to ensure uninterrupted supply. Multiple compressors can be installed in parallel, with automatic switching mechanisms to maintain supply in case of a compressor failure or maintenance activities.

6. Monitoring and Alarms:

Modern screw compressors used in medical air supply systems often feature advanced monitoring capabilities. They can continuously monitor and record key parameters such as pressure, temperature, and system performance. Alarms and alerts can be configured to notify operators or maintenance personnel in case of abnormal conditions or potential issues with the compressor.

7. Compliance with Standards and Regulations:

When using screw compressors for medical air supply, it is essential to comply with relevant standards and regulations. These may include medical device regulations, electrical safety standards, and guidelines specific to medical gas systems. Compliance ensures that the medical air supply system meets the necessary safety and quality requirements.

In summary, screw compressors can be used for medical air supply, providing reliable and efficient compressed air for various medical applications. With their reliability, oil-free operation, adherence to air quality standards, integrated drying and filtration capabilities, and the ability to incorporate redundancy and monitoring features, screw compressors are well-suited for medical air supply systems in healthcare facilities.

air compressor

What Are the Key Components of a Screw Compressor?

A screw compressor consists of several key components that work together to compress air or gas. Here’s a detailed explanation of these components:

1. Male and Female Rotors:

The male and female rotors are the primary components of a screw compressor. These helical rotors have specially designed profiles that interlock with each other. The male rotor typically has fewer lobes or threads compared to the female rotor. As the rotors rotate, the interlocking lobes create compression chambers that gradually reduce in volume, compressing the air or gas.

2. Compression Chamber:

The compression chamber is formed by the interlocking lobes of the rotors. It is the space where the air or gas is compressed as the rotors rotate. The volume of the compression chamber decreases as the lobes move towards the discharge end, resulting in the compression of the trapped air or gas.

3. Inlet and Outlet Ports:

The inlet port is the entry point through which the air or gas enters the screw compressor. It is typically located at the suction side of the compressor. The inlet port allows the air or gas to flow into the compression chamber during the suction process. The outlet port is the exit point through which the compressed air or gas is discharged from the compressor.

4. Drive System:

The drive system of a screw compressor consists of a motor and a drive mechanism. The motor provides the rotational power required to drive the rotors. Common types of drive mechanisms include direct drive, belt drive, and gear drive. The drive system ensures that the rotors rotate in opposite directions at the desired speed and synchronization.

5. Oil System (in oil-injected compressors):

In oil-injected screw compressors, an oil system is present to provide lubrication, cooling, and sealing between the rotors. The oil system typically includes an oil reservoir, an oil pump, oil filters, and oil coolers. The lubricating oil is injected into the compression chamber, where it forms a thin film on the rotors, reducing friction and minimizing wear.

6. Cooling System:

Screw compressors often incorporate a cooling system to maintain optimal operating temperatures. The cooling system may include air or water-cooled heat exchangers, which dissipate the heat generated during compression. Cooling ensures that the compressor operates within safe temperature limits, preventing overheating and prolonging the lifespan of the components.

7. Control System:

A control system is an essential component of a screw compressor, providing monitoring and regulation of various parameters. It may include sensors, controllers, and safety devices to measure and control variables such as pressure, temperature, and operating conditions. The control system ensures efficient and safe operation of the screw compressor.

8. Sound Attenuation and Vibration Isolation:

To reduce noise and vibration, screw compressors are often equipped with sound attenuation measures and vibration isolation systems. These components help in minimizing the noise and vibrations generated during operation, making the compressor suitable for noise-sensitive environments.

In summary, the key components of a screw compressor include the male and female rotors, compression chamber, inlet and outlet ports, drive system, oil system (in oil-injected compressors), cooling system, control system, and sound attenuation/vibration isolation components. These components work together to enable the efficient compression of air or gas in the screw compressor.

China Hot selling High Efficiency Variable Speed 37kw 50HP Two Stage Screw Air Compressor for Industrial   arb air compressorChina Hot selling High Efficiency Variable Speed 37kw 50HP Two Stage Screw Air Compressor for Industrial   arb air compressor
editor by CX 2024-05-09

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