Water-lubricated oil-free screw
Water as the sealing/cooling medium—distinct subcategory when residual oil risk must stay extremely low.
Air Compressors / Oil-free compressors
Oil-free compressors
Water-lubricated oil-free screw, dry oil-free rotary screw with Class 0 capability where required, oil-free scroll, and oil-free boosters for PET bottle-blowing and high-pressure trains—selected by air quality class and process risk, not by OEM brand lists.
Typical ranges
- Water-lubricated oil-free screw: commonly from roughly mid-single-digit kW into 100+ kW depending on duty
- Dry oil-free multi-stage screw: plant-scale packages; Class 0 positioning where process requires it
- Oil-free scroll: smaller point-of-use and specialty duties
- PET / high-pressure oil-free: screw + booster trains sized to bottle-blowing pressure (often tens of bar)—confirm target bar and FAD
Typical configurations
- Water-lubricated oil-free screw for oil-sensitive plant air
- Dry oil-free rotary screw (2- or 3-stage) for Class 0–oriented process air
- Oil-free scroll for compact, low-noise point-of-use
- Oil-free medium/high-pressure and special-gas variants on inquiry
- PET bottle-blowing trains: oil-free screw + oil-free piston/screw booster
Technology sections
Dry oil-free screw (Class 0)
Multi-stage dry screw for processes that specify Class 0 capability and tight air quality assurance.
Oil-free scroll
Compact oil-free delivery for smaller flows and quieter installations.
PET / high-pressure boosters
High-pressure oil-free trains for bottle-blowing and elevated discharge pressure duties.
Frequently asked questions
What is water-lubricated oil-free screw?
Water-lubricated oil-free screw uses water as the sealing/cooling medium in the compression chamber, avoiding lubricating oil in the airend—chosen where oil contamination risk must be minimized.
When is dry oil-free screw (Class 0) required?
Dry multi-stage oil-free screw is specified when processes demand the highest oil-free assurance (Class 0 positioning where required)—food, pharma, electronics, and sensitive process air.
Where do oil-free scroll compressors fit?
Oil-free scroll suits smaller, quieter point-of-use or lab/medical-adjacent duties with modest flow compared with large plant screw or centrifugal machines.
What about PET bottle-blowing high-pressure trains?
PET and high-pressure oil-free trains often combine a screw stage with an oil-free booster (or dedicated high-pressure oil-free machines) to reach bottle-blowing pressures. Share target bar and FAD in your inquiry.
Need a fit for this category?
Share pressure, flow, duty cycle, and air quality targets. EntryAir responds in category language—no OEM brand pages, no cart.