KEH Series High Pressure Two-stage Rotary Screw Air Compressor (20-40 bar) | Kotech
The KEH Series utilizes advanced two-stage compression technology to deliver stable high-pressure air up to 40 bar. Designed for energy efficiency and 24/7 reliability, it is the ideal choice for PET blowing, hydropower, and precision industrial testing.
Provide your required pressure (bar) and airflow (m3/min). Our technical team will match the optimal KEH configuration and send a competitive quote within 24 hours.
High-Pressure Decision Data
Key engineering specifications of the KEH Two-stage Series to help you verify technical compatibility for your high-pressure project.
Why KEH Series Leads in High-Pressure Projects
Maximize your production efficiency with our two-stage compression technology, specifically designed to handle heavy-duty high-pressure tasks with lower energy overhead.
What High-Pressure Air Buyers Usually Worry About
- Extreme energy costs of traditional single-stage high-pressure units
- Pressure instability during critical PET blowing or testing processes
- Frequent mechanical failure under high-load continuous operation
- High maintenance costs and difficult part sourcing for high-pressure systems
How KEH Series Reduces Procurement Risk
- Lower compression ratios per stage save up to 15% on electricity bills
- Precision PLC control maintains constant pressure with zero fluctuation
- Industrial-grade structure prevents overheating and premature wear
- Simplified internal layout allows for fast and low-cost routine maintenance
Recommended Applications
The KEH series provides stable high-pressure air (up to 45 bar) with water-cooled durability. Ideal for continuous heavy-duty industrial processes requiring precision and power.
KEH Series High Pressure Air Compressor Parameters
Review the detailed technical data for the KEH series. Featuring a working pressure range of 3.0 to 4.5 Mpa and a motor power range of 11kW to 250kW, these water-cooled reciprocating compressors are designed for maximum efficiency in PET blowing and heavy-duty industrial applications. Contact our engineers for customized configuration planning.
| Model | Airflow(m³/min) | Working Pressure(Mpa) | Power(kw) | Cooling Air Volume(m³/h) | Outlet Size | Dimensions(L) | Dimensions(W) | Dimensions(H) | Weight(kg) |
|---|---|---|---|---|---|---|---|---|---|
| KEH-45A | 5.0 | 3 | 45 | 8370 | DN32 | 2380 | 1600 | 1750 | 2130 |
| KEH-90A | 10.0 | 3 | 90 | 16740 | DN40 | 3000 | 1700 | 1900 | 3200 |
| KEH-132A | 15.0 | 3 | 132 | 24550 | DN40 | 3000 | 1700 | 1900 | 3800 |
| KEH-200A | 20.5 | 3 | 200 | 37200 | DN50 | 3500 | 1900 | 2250 | 4600 |
| KEH-220A | 25.0 | 3 | 220 | 40920 | DN50 | 3500 | 1900 | 2250 | 5300 |
| KEH-45W | 5.0 | 3 | 45 | 4.64 | DN32 | 2650 | 1650 | 1960 | 2130 |
| KEH-90W | 10.0 | 3 | 90 | 9.29 | DN40 | 2650 | 1650 | 1960 | 3200 |
| KEH-132W | 15.0 | 3 | 132 | 13.62 | DN40 | 3000 | 1650 | 2050 | 3800 |
| KEH-200W | 20.5 | 3 | 200 | 20.64 | DN50 | 3450 | 1900 | 2250 | 4600 |
| KEH-220W | 25.0 | 3 | 220 | 22.70 | DN50 | 3450 | 1900 | 2250 | 5300 |
| KEH-55A | 5.0 | 4 | 55 | 10230 | DN32 | 2380 | 1600 | 1750 | 2130 |
| KEH-110A | 10.0 | 4 | 110 | 20460 | DN40 | 3000 | 1700 | 1900 | 3200 |
| KEH-160A | 15.0 | 4 | 160 | 29760 | DN40 | 3000 | 1700 | 1900 | 3800 |
| KEH-220A | 20.5 | 4 | 220 | 40920 | DN50 | 3500 | 1900 | 2250 | 4600 |
| KEH-250A | 25.0 | 4 | 250 | 46500 | DN50 | 3500 | 1900 | 2250 | 5300 |
| KEH-55W | 5.0 | 4 | 55 | 5.68 | DN32 | 2650 | 1650 | 1960 | 2130 |
| KEH-110W | 10.0 | 4 | 110 | 11.35 | DN40 | 2650 | 1650 | 1960 | 3200 |
| KEH-160W | 15.0 | 4 | 160 | 16.51 | DN40 | 3000 | 1650 | 2050 | 3800 |
| KEH-220W | 20.5 | 4 | 220 | 22.70 | DN50 | 3450 | 1900 | 2250 | 4600 |
| KEH-250W | 25.0 | 4 | 250 | 25.80 | DN50 | 3450 | 1900 | 2250 | 5300 |
| KEH-75W | 5.0 | 5 | 75 | 7.74 | DN32 | 2650 | 1650 | 1960 | 2560 |
| KEH-132W | 10.0 | 5 | 132 | 13.62 | DN40 | 2650 | 1650 | 1960 | 3100 |
| KEH-185W | 15.0 | 5 | 185 | 19.09 | DN40 | 3000 | 1650 | 2050 | 4050 |
| KEH-250W | 20.5 | 5 | 250 | 25.80 | DN50 | 3450 | 1900 | 2250 | 4950 |
| KEH-280W | 25.0 | 5 | 280 | 28.90 | DN50 | 3450 | 1900 | 2250 | 5650 |
[caption id="attachment_518" align="aligncenter" width="800"]
30 – 50 Bar Middle Pressure PET Screw Air Compressor[/caption]
High-pressure Section-reliable Single-screw Air End
No leakage triangle, volumetric efficiency is greater than 90%, higher efficiency, single-stage compression ratio under normal pressure is as high as 30.
The dynamic balance of the meshing pair is better, which makes the bearingsand other components have a longer life, and makes the vibration and noise of the whole machine smaller.
The star wheel is made of special rare materials with better mechanical properties, and precise processing technology reduces vibration and wear.
The high-precision manufacturing and processing of the single-screw air end shell in the high-pressure section enables it to withstand pressures up to 70bar.
[caption id="attachment_521" align="aligncenter" width="2560"]
30 – 50 Bar Middle Pressure PET Screw Air Compressor2[/caption]
The PM VSD motor is combined with vector frequency conversion technology to accurately adjust the speed and compression ratio, and the voltage adjustment range can reach 2.5~5.0MPa.
Constant Pressure Air Supply
Frequency conversion control can instantly respond to changes in air volume used by customers, and the air supply pressure fluctuation is stable below ±0.1kg/cm2.
There is no 1~2kg/cm2 setting required for the empty-to-weight difference of traditional air compressors.
[caption id="attachment_520" align="aligncenter" width="400"]
30 – 50 Bar Middle Pressure PET Screw Air Compressor2[/caption]
High-Efficiency Two-Stage Compression Air End
➱The two compression stages are driven by precise gears, so that the rotor of each stage of compression unit can obtain the ideal linear speed, making the air compressor have better energy efficiency.
➱Mist cold oil is sprayed between the first and secondary air end for intermediate cooling. The optimized flow channel design allows the compressed air to pass through with almost zero loss, significantly improving efficiency.
➱The entire series comes standard with permanent magnet variable frequency motors, combined with vector frequencyconversion technology, to precisely sense changes in air volume demand and adjust speed, making it more efficient and energy-saving.
➱The normal pressure section will produce first compressed air with a pressure of 6 bar. After oil and gas separation and cooler, it passes through the standard external freeze dryer and then enters the high pressure section for compression.
The compression process in the normal pressure section is closer to ideal isothermal compression, the compression efficiency is higher.
[caption id="attachment_522" align="aligncenter" width="400"]
30 – 50 Bar Middle Pressure PET Screw Air Compressor[/caption]
Have Questions? Contact Us
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Frequently Asked Questions
The KEH series is specifically designed for high-pressure applications, offering a stable working pressure range from 20 bar to 40 bar ($2.0text{--}4.0text{ MPa}$), making it ideal for PET blowing and industrial leakage testing.
By using two-stage compression technology, the KEH series reduces the compression ratio of each stage. This results in significantly lower internal leakage and up to 15% higher energy efficiency compared to single-stage high-pressure units.
Yes. It is engineered for 24/7 heavy-duty operation. With high-quality components like SKF bearings and an optimized cooling system, it ensures stable performance even under extreme temperatures and continuous high-load conditions.
This series is widely used in PET bottle blowing, hydropower stations, valve testing, aerospace, and oil & gas industries where reliable $20text{--}40text{ bar}$ compressed air is a critical requirement.
We equip the KEH series with high-efficiency motors (standard IP54/IP55 protection grade). This ensures the motor is well-protected against dust and water, extending the lifespan of the entire drive system.
Absolutely. The unit features an advanced PLC smart control system that monitors pressure in real-time, ensuring a pulse-free and consistent air supply with minimal pressure fluctuation.
Despite its advanced technology, the KEH series is designed with a user-friendly layout. All consumable parts (filters, oil separators) are easily accessible, allowing for quick routine maintenance and reduced downtime for your production line.
