China 3bar Low Pressure Oil Injected Industrial Rotary 37kw 50HP Screw Air Compressor for Industrial Gases Nitrogen

Product Description

Product Description

Product features of low pressure screw air compressor:

1. Adopt large rotor and low speed to ensure the high performance of the machine;
2. Increase oil and gas separation equipment to ensure that the export oil content is ≤3ppm;
3. The air source of the low-pressure screw air compressor is clean, which reduces the number of cleaning nozzles of texturing machines and other equipment, and improves the quality of the finished product;
4. The heat dissipation area of the oil cooler is increased by more than 30% to ensure normal operation in summer without over-temperature;
5. Independently design the internal pressure ratio of the host to ensure a better specific power;
6. Intelligent control system, automatically adjust the exhaust volume according to the customer’s usage (frequency conversion model).
7. For the texturing industry, ensure long-term continuous operation, set fault warnings, and do not stop immediately, so that customers are fully prepared for shutdown;
8.  Adopting dual air outlet design, the air outlet temperature can be adjusted according to climate changes, meeting customer needs to a greater extent, and achieving high efficiency and energy saving at the same time.

1. Efficient airend
There is no intermediate transmission, so there is no energy loss; direct drive increases reliability and reduces maintenance costs; large rotors run at low speeds, with higher efficiency, lower noise, lower vibration, and lower energy consumption.

2. High-quality independent oil pump forced lubrication design
(1) Forced lubrication with independent oil pump;
(2) Ensure that there is sufficient fuel injection and a better air-fuel mixture ratio under extremely low exhaust pressure (2kg).

3. Increase customized oil and gas separation system
Increase the customized oil and gas separation system to ensure the ultimate oil and gas separation effect and ensure that the oil content of the air is less than 3ppm.

Product Parameters

Low-pressure permanent magnet variable frequency air compressor parameters:

Model Volume flow(m3/min) Pressure(Mpa/bar) Power(kW) Noise(DB) Outlet diameter Dimension(mm) Weight(kg)
DHH37LM 10.0 0.3/3 37 65 G2 2000*1120*1590 1180
9.6 0.4/4
8 0.5/5
DHH45LM 15.1 0.2/2 45 65 G2 2100*1677*1892 2500
12.2 0.4/4
9.3 0.5/5
DHH55LM 22 0.2/2 55 70 DN150 2800*1860*1900 3200
15.61 0.3/3 DN100 2100*1677*1892 2600
15.48 0.4/4
12.00 0.5/5
DHH75LMH 29.5 0.2/2 75 70 DN150 2800*1860*1900 3200
21.5 0.3/3
21.0 0.4/4
16.1 0.5/5 DN65 2400*1630*1980 1850
DHH90LMH 31.0 0.2/2 90 72 DN150 2800*1860*1900 3300
28.8 0.3/3
21.0 0.5/5
DHH110LMH 37.0 0.2/2 110 72 DN200 2900*2100*2150 4800
33.0 0.3/3
28.5 0.4/4
DHH132LMH 47 0.2/2 132 78 DN200 2900*2100*2150 4950
43.8 0.3/3
32.5 0.4/4
28.3 0.5/5 DN80 2800*1828*2150 3600
DHH160LMH 55.7 0.2/2 160 78 DN300 4500*2200*2200 6800
49.4 03/3 DN200 2900*2100*2150 5100
43.0 0.4/4
DHH185LMH 60.0 0.3/3 185 78 DN200 4500*2200*2200 6900
43.0 0.5/5

Parameters of two-stage low-pressure screw air compressor:

Model Volume flow(m3/min) Power(kW) Noise(DB) Outlet diameter Dimension(mm) Weight(kg)
0.45~0.5mpa 0.55mpa
DHH30LDM 7.06 6.95 30 68 G2 1600*1060*1470 1338
DHH37LDM 10.0 9.20 37 68 G2 1600*1060*1470 1438
DHH45LDM 11.98 11.65 45 70 DN65 2400*1630*1980 1734
DHH55LDM 15.57 15.48 55 70 DN65 2400*1630*1980 1980
DHH75LDM 18.51 18.32 75 72 DN65 2400*1630*1980 2080
DHH90LDM 22.92 22.51 90 72 DN80 2800*1828*2150 4700
DHH110LDM 26.81 26.11 110 72 DN80 2800*1828*2150 4850
DHH132LDM 32.5 31.98 132 78 DN80 2800*1828*2150 4850
DHH160LDM 41.11 40.68 160 78 DN100 3000*1900*2190 5000
DHH185LDM 43.88 43.52 185 78 DN100 4360*2150*2258 7200
DHH220LDM 55.31 55.06 220 80 DN200 4360*2150*2258 7200
DHH250LDM 60.31 60.12 250 80 DN200 4360*2150*2258 7500


Company Profile

We’re professional compressor factory since 1996. Germany Standard and 13 years exporting experience help us won more than 50 loyal foreign agents. 

Our products line are complete,main products as below.
1. Ordinary fixed speed air compressor

2. Energy saving series:
VSD screw air compressor
Permanent magnet VSD screw air compressor
Double stage PM VSD screw air compressor

3. Oil free series:
Oil free water lube screw air compressor
Dry oil free type
Oil free scroll type

4. Low pressure series:
3-5bar, main for textile industry
0.4-1.5 bar,main for waste water treatment

5. 16bar-30bar special for laser cutting industry

6. After-treat equipment
Refrigerated air dryer
Desiccant air dryer
High efficiency pipeline filter

And all the compressor parts.

Packaging & Shipping

Why choose us


Q1. Are you trading company or manufacture ?

A: We are professional manufacture of screw air compressor of HangZhou(Close to ZheJiang ), China, more than 24 years.

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.Worldwide 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.

Choose an Air Compressor for Your Business

There are several factors to consider when choosing an air compressor for your business. One factor to consider is the type of compressor you are looking for, which may include single-stage, low noise, and positive displacement. Hope this article helps you make the right decision. After all, your business success will depend on this device! Let’s take a closer look at these factors. Also, consider what compressor manufacturers say about their products.

Positive displacement

Positive displacement air compressors compress air by drawing in a volume from an inlet and extruding it out of a chamber. This increases the pressure at which the gas can be pumped at rates that cannot be pumped through the outlet at lower pressures at higher mass flow rates. These types of compressors are available in single-acting and double-acting configurations. They are classified by the number of cylinders.
There are 2 different types of air compressors: reciprocating air compressors and screw compressors. Both are roll machines. Positive displacement air compressors use pistons and cylinders to compress air. The resulting air pressure builds up within the compressor housing, increasing the potential energy of the compressed air. Screw air compressors are the most popular positive displacement air compressors, which can be either single-stage screw-blade air compressors or multi-stage screw-blade oil-immersed screw air compressors.
Positive displacement flowmeters use a rotating measuring chamber to divide the fluid into discrete quantities. The number of times the chamber was refilled and emptied was used to estimate the total flow. However, positive displacement flow meters are prone to leaks, reducing the accuracy of the estimates. If a leak occurs, it can cause false readings and damage the compressor. However, leaks in positive displacement air compressors can reduce pressure.
The most common types of positive displacement air compressors are screw, reciprocating, and vane. Rotary positive displacement air compressors are also available as well as many other air compressors. Positive displacement air compressors are most commonly used in large manufacturing facilities. If you are considering an air compressor for commercial or industrial applications, it is imperative to understand how the components of the unit work. Please read the information below to learn more before deciding which application is best for you.
Positive displacement air compressors use a piston to force air into a chamber, compressing the air in the process. The piston moves in the opposite direction, thereby reducing the volume of the chamber. When the amount of air in the chamber reaches its maximum value, the valve opens, allowing it to escape at higher pressure. Positive displacement air compressors are generally less efficient than centrifugal compressors. However, they are still an excellent choice for a variety of applications.


The discharge pressure of the single-stage air compressor is used to control the operation of the compressor. Properly designed load/unload controls allow the air compressor to operate at its most efficient point while minimizing stress on the main engine bearings. Single-stage air compressors can approach variable speed efficiency with appropriate storage capacity. However, improper storage can cause premature bearing wear on the main unit. If this is the case, a single-stage air compressor may not be ideal.
A single-stage air compressor has only 1 cylinder, which means 1 stroke is required to move air from 1 cylinder to another. Pressure is measured in cubic feet per minute or CFM. Tank size is also important as a large single-stage air compressor may be required to operate multiple air tools. Single-stage air compressors can be used in a variety of applications and can last for years.
For the most common uses, single-stage air compressors are the most practical option. These devices work with most hand tools, from hammers to grinders. Single-stage air compressors are lightweight and easy to move. However, two-stage air compressors provide more CFM, making them a better choice for industrial or commercial use. However, two-stage compressors are not suitable for private use. Therefore, if your main purpose is DIY and craft projects, it is better to choose a single-stage air compressor.
Compared with two-stage air compressors, single-stage screw air compressors are cheaper. They come from a variety of manufacturers and range in power from 3 to 600 horsepower. Single-stage air compressors are a cost-effective solution for a variety of air compressor needs. They offer flexibility and multiple control methods, making them an excellent choice for many different applications. Therefore, when choosing an air compressor for your business, choose the 1 with the most suitable functions.
Single-stage air compressors are the most affordable and easy-to-use air compressors for small to medium jobs. They also have higher compression ratios. The compression ratio is the ratio of absolute discharge pressure to absolute inlet pressure. When calculating the ratio, it takes into account atmospheric pressure and gauge pressure. The compression ratio pushes the surface area of ​​the rotor, which increases the thrust load.
Single-stage air compressors are smaller and easier to transport than two-stage units. Single-stage air compressors have 1 air intake, and two-stage air compressors have 2 air intakes. The difference between single-stage and two-stage air compressors largely depends on the number of times the air is compressed. A single-stage air compressor compresses the air once, while a dual-stage air compressor compresses the same amount of air twice.

low noise

Low noise air compressors are ideal for a variety of applications. While no air compressor is completely silent, some models are much quieter than others. For the Hitachi EC28M portable compressor, the noise level is 59 decibels. The compressor features steel rollers that protect the internal components and give it a sleek, modern look. It also has a one-gallon fuel tank and a half-horsepower drive.
Noise from air compressors can be distracting and reduce productivity. It is important to choose low-noise air compressors to keep employees healthy and happy at work. While noise is an unfortunate aspect of working on the shop floor, reducing it can improve productivity. By reducing distracting noise, employees can focus on their work and communicate more effectively. That means higher quality work and happier clients. If you’re looking for a low-noise air compressor, be sure to read the tips below.
Low noise air compressors are an excellent choice for businesses of all sizes. These powerful tools can run multiple tools simultaneously. The 2 water tanks are made of rust-resistant aluminum and are stackable. This air compressor is heavier and can handle large jobs with ease. It costs more than other air compressors, but it can handle a lot of work efficiently. CZPT Air Tools air compressors come with a one-year warranty and are highly recommended by contractors.
Noiseless air compressors are generally more expensive than comparable products, but they are worth the extra cost. Noiseless compressors are a good option for businesses that need to avoid disturbing nearby people. For example, you might want to consider a low-noise air compressor for a dental office, which cannot tolerate noise. Fortunately, this problem can be solved by relocating the compressor to a location that is more isolated from your workspace.
One brand of low-noise air compressors offers 2 models. The CZPT Air Tools 2010A features a large cast aluminum can, regulating pressure gauge, and 2 universal quick-connects. It produces 68 decibels of noise when it works. It has a large 8-gallon fuel tank capacity and has wheels and handles for easy transport. Its powerful engine produces a low noise level of 68 decibels.
Another popular low noise air compressor is the Makita MAC210Q Quiet Series. This model is capable of producing up to 71.5 decibels of sound, which is the amount of air it produces at 90PSI. The MAC210Q features a durable oil-free pump and weighs just 36 pounds with a handle and wheels. These compressors are easy to move and ideal for indoor work.
China 3bar Low Pressure Oil Injected Industrial Rotary 37kw 50HP Screw Air Compressor for Industrial Gases Nitrogen  China 3bar Low Pressure Oil Injected Industrial Rotary 37kw 50HP Screw Air Compressor for Industrial Gases Nitrogen

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