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40 Bar High-pressure Oil-free Water-injection Screw Air Compressor for Bottle Blowing Industry

250kW 8 bar Food Grade Oil Free Water Lubricated Screw Air Compressor

40 Bar High-pressure Oil-free Water-injection Screw Air Compressor for Bottle Blowing Industry

1. Air delivery: 30m ³/min 1059cfm
2. Pressure: 2.5~4.0MPa/25~40 bar/362.5~580 psi
3. Power: 332kW/443 hp

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Product Description

Oil-free water-lubricated permanent magnet variable frequency screw air compressor is an air compressor that uses pure water (or water-based lubricant) instead of traditional lubricating oil, combines permanent magnet synchronous motor and variable frequency speed regulation technology, and provides 100% oil-free compressed air to meet high cleanliness requirements.

RWH-332W

Features

100% Oil-Free, Class 0 Certified. Uses purified water for lubrication and sealing - no oil contact with compression chamber. Exceeds ISO 8573-1 Class 0 oil-free air standard. Ideal for sensitive industries like PET blowing, food & beverage, pharmaceuticals, and electronics.

Medium-High Pressure Output (25-40 bar) in two Stage. Specially designed rotor profile and cooling system for stable 25-40 bar discharge. No need for a booster; directly supplies high-pressure air for demanding applications. Minimal pressure fluctuation improves downstream equipment reliability.

Energy Efficient - Water Injection Cooling Water serves as both lubricant and coolant, offering superior heat exchange vs. oil. Lowers discharge temperature and reduces energy consumption. Optional permanent magnet motor saves additional 15-25% energy compared to traditional dry oil-free screw compressors.

Low Maintenance Cost & Easy Service. No oil, oil filter, or oil separator needed - only periodic replacement of water filter and seals. No carbon deposits or sludge build-up, extending life of the air end. Modular design reduces total maintenance cost by over 30% compared to oil-injected or dry oil-free machines.

Product Parameters

Model	Volume flow (m³/min)	Motor power (kW)	Maximum working pressure (bar)	Noise (DB)	Cooling water inlet/outlet diameter (In,Out)	Cooling water volume≤ intale temperature (T/h)	Lubricating water volume (L)	Dimensions LWH (mm)	Weight (kg)	Air outlet pipe diameter
RKH-332W	30.0	132+132 132+160 132+200	25 30 40	86	DN125	76	500	420020502250	5000 5200 5400	DN65

Typical Applications

PET Bottle Blowing-High-pressure oil-free air for blow molding machines
Food & Beverage-Direct contact with products- requires 100% oil-free air
Pharmaceuticals-Clean compressed air for fermentation, packaging, coating
Electronics / Semiconductors-Oil-free air for cleanroom manufacturing
High-pressure Nitrogen Boosting-Combined with nitrogen generator for laser cutting, electronics
Laboratory & Research-Quiet, oil-free, stable high-pressure air supply.