KEH Series | High Pressure Two-stage Rotary Screw Air Compressor (30-50 bar) | Kotech
The KEH Series adopts two-stage compression + high-pressure single-screw air end, delivering stable medium-pressure air up to 50 bar. Built with PM VSD motor and vector frequency conversion, volumetric efficiency exceeds 90%. It is engineered for 24/7 continuous operation, ideal for PET blowing, tire manufacturing and gas boosting.
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Functional Configuration
- PM VSD Motor & Vector Inverter
- Precise speed & compression ratio adjustment
- High-Pressure Single-Screw Air End
- No leakage triangle, withstand up to 70bar
- Two-Stage Compression Structure
- Inter-stage mist oil cooling, near isothermal compression
- Special Rare Material Star Wheel
- Low vibration, low wear & long service life
- Constant Pressure Air Supply
- Pressure fluctuation stable below ±0.1kg/cm²
- Intelligent Full-Automatic Test System
- Overspeed / Overpressure / Overtemperature test
- Multi-Language HMI Panel
- Remote on/off & sequential multi-unit control
- RS485 & CAN Bus Communication
- Optional 4G IoT remote monitoring
- Modular Power Management Module
- Real-time energy consumption statistics
Performance Parameters
- Working Pressure
- 30–50 bar （435.11–725.19 psi）
- Air Delivery
- 5–25 m³/min （176.57–882.87 cfm）
- Power Rate
- 45–280 kW （60.35–375.49 hp）
- lumetric Efficiency
- >90%
- Pressure Fluctuation
- ≤ ±0.1 kg/cm²
Why KEH Series Leads in Medium-Pressure Projects
What Medium-Pressure Air Buyers Usually Worry About
- High energy consumption of traditional medium-pressure high compression ratio compressors
- Unstable air pressure affects PET blowing and tire molding product quality
- High vibration & noise shorten bearing and air end service life
- Pressure fluctuation caused by frequently changing air consumption
- Difficult centralized management for multiple compressor units
- High failure risk under long-time continuous heavy-duty operation
How KEH Series Reduces Procurement Risk
- Single-screw high-pressure air end eliminates leakage triangle, volumetric efficiency >90%
- Vector VSD control keeps pressure fluctuation within ±0.1kg/cm² for consistent production
- Optimized meshing pair balance lowers vibration, noise and component wear
- Two-stage compression with inter-stage mist cooling improves energy efficiency
- RS485/CAN communication supports multi-unit sequential control, optional 4G IoT remote monitoring
- Each machine undergoes strict overspeed, overpressure, overtemperature & harsh condition simulation tests
- Modular power management module records real-time energy consumption for cost analysis
Recommended Applications
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.
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.
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.
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.
KEH Series High Pressure Air Compressor Parameters
| 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 |
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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.
