Water-Lubricated Oil-Free Screw Air Compressor

Purified water, rather than oil, is the lubricating and cooling medium inside this water-lubricated oil--free screw air compressor - the key difference from conventional oil-injected screw machines. Nothing oil-based enters the compression chamber, so the delivered air is 100% oil-free and food-grade clean. The screw rotors are made of stainless steel, so they resist corrosion and never rust inside the water circuit; a water sealing system removes any risk of oil contamination from the drive side. Because the water absorbs compression heat directly, the process runs close to isothermal compression, which keeps efficiency high and temperatures low. There is no waste oil to drain or dispose of, and no oil filter or oil separator to buy over the machine's life, so maintenance stays simple and the total running cost is low. The low compression temperature also keeps the water circuit stable, with no need for the complex oil-cooling hardware that oil-injected machines carry, and the unit runs quietly enough for indoor installation near production lines. Compared with dry-type oil-free screw machines that depend on wear-prone rotor coatings, the water-lubricated path uses solid stainless steel rotors that never lose a protective layer, so oil-free air quality stays consistent over years of service, with no coating layer to wear away. Compared with oil-injected machines, there is no oil carry-over, no oily condensate to treat and no periodic oil change - which matters in food-grade environments where waste oil disposal is regulated. The unit also produces no waste oil, which simplifies environmental compliance in regulated plants. For buyers between oil-injected screw and dry oil-free screw machines, this unit offers the oil-free air quality that sensitive processes require, at a lower maintenance burden than dry-type machines. It is the right choice wherever trace oil carry-over would spoil a product or contaminate a process, but where a full centrifugal Class 0 station would be oversized for the demand.

The water-lubricated airend and its sealing system are assembled on a dedicated line with fixed process parameters - rotor clearance, water-circuit sealing and corrosion checks are repeated identically on every unit. For food and pharmaceutical buyers, that consistency matters: a single assembly variation in the water circuit can become an oil contamination risk or a rust point that a visual inspection would miss, while the controlled process means every unit leaves the factory with the same sealed, oil-free water path.

Export packaging uses a wooden pallet with plastic foam cushioning, suitable for sea freight to intercontinental destinations. We support EXW, FOB, CIF and DDP terms, and accept USD, EUR, CNY and offshore CNY. Standard models are delivered in 40 days; customized units take 60 days, with 30% advance payment and 70% balance before shipment. 

FAQ

 

Q: How long is the delivery time for standard water-lubricated models?

A: Standard models are delivered in 40 days, thanks to stocked materials for common configurations; customized units take 60 days.

Q: Do you provide free samples?

A: We do not provide free samples. A sample or prototype unit can be produced for confirmation before mass production, with a custom sample development cycle of about 60 days.

Q: Do you accept third-party inspection?

A: Yes. Every machine is 100% inspected before packing, including continuous running, pressure and sealing tests, and we welcome third-party inspection before shipment.

Hot Tags: water-lubricated oil-free screw air compressor, China water-lubricated oil-free screw air compressor manufacturers, suppliers, factory, Air Compressor For Chemical, Explosion Proof Air Compressor, High Pressure Screw Air Compressor, Inverter Screw Air Compressor, Magnetic Bearing Centrifugal Air Compressor, Water Lubricated Oil Free Screw Air Compressor