A water injected compressor is an oil-free machine that replaces oil with water as both the sealing medium and the coolant inside the compression chamber. CMN builds this concept on a single-screw platform, where water is injected directly into the compression cavity during operation. The result is air that contains no oil aerosols, no oil vapor, and no hydrocarbon carryover — a key requirement for food, beverage, pharmaceutical, and electronics production.
A true water injected compressor differs from a "water-cooled" machine. Cooling water in a water-cooled unit never touches the air path; in a water injected unit, water is deliberately introduced into the compression chamber.
Water acts as the lubricant between the screw and the star-wheel (or rotors), removing the need for oil film.
Water absorbs heat at the point of compression, keeping the process close to isothermal.
The discharged air passes through a separator and dryer before it reaches the network.
No oil circuit means no oil filters, no oil separator, and no oil-change intervals.
CMN's water-lubricated single-screw compressor uses one main screw meshing with two star-wheels. Water is sprayed into the chamber where it:
Seals the compression pockets to prevent internal leakage.
Cools the air almost immediately, so discharge temperatures stay in the near-isothermal range of roughly 40–50°C.
Washes away fine particles and keeps the rotors clean.
Because the single-screw layout balances radial forces, the main bearing load is lower than in many twin-screw designs, which supports long service life.
Benefit | Why it matters |
ISO 8573-1 Class 0 | Certified oil-free air protects product and process |
Near-isothermal compression | Lower temperatures reduce energy waste and wear |
Fewer consumables | No oil, fewer filters, lower running cost |
Quiet operation | Water damping reduces vibration and noise |
PMVSD option | Matches output to demand for extra savings |
This technology suits any process where contamination is unacceptable:
Beverage and bottled-water plants needing clean blowing air.
Food processing lines where air contacts the product.
Pharmaceutical and medical air systems.
Electronics and semiconductor cleanrooms.
Textile mills that need oil-free air for spinning and weaving.
CMN offers water injected compressor models across a 2–40 bar range, including medium-pressure units built for PET bottle blowing. Models such as the CM75G, CM110G, and the PMVSD-driven CM110GPV, CM130GPV, and CM200GPV give buyers a scalable path from small workshops to high-output lines.
A water injected compressor is the most direct route to certified oil-free air without the complexity of an oil-free dryer chain. CMN's single-screw, water-lubricated design pairs Class 0 purity with near-isothermal efficiency and a simplified maintenance profile.
Contact CMN to discuss your pressure and flow requirements, or send your specifications to request a tailored quote.
sales@cmncompressor.com 
+86-15325678508 
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