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The rotor is installed eccentrically in the pump cavity (stator). There are three slots on the rotor, and the rotary vanes can slide freely inside. The rotary vane divides the internal space into three cavities. The volume of these cavities changes as the rotor rotates. The gas entering the air inlet chamber is compressed and then discharged out of the pump through the exhaust valve.

The oil injected from the air intake cavity plays the role of sealing, lubrication and cooling. The oil is entrained by the compressed gas and is roughly separated by gravity as it enters the tank. Small oil molecules enter the exhaust filter. The proportion of oil in the vented gas is reduced below visible values (greater than 99% capture rate). Internal circulation ensures that the collected oil returns to the pump chamber. The check valve in the oil return screw prevents oil from flowing from the pump chamber to the tank. Causes oil to leak from the exhaust port. Special versions of the pump are available for operation at high inlet pressures, please contact us.

Depending on the product number, pumps with gas ballast are used for pumping permanently condensable gases.

The anti-backflow valve at the air inlet prevents oil from returning to the air intake side when the pump is stopped. However, it is not a safety valve and the anti-backflow valve will only work properly if it is clean and in good condition.