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This is of a dried out vacuum pump is a pump that does not use any fluids to make a vacuum or contact the procedure gas and can also discharge to atmosphere. … Timing gears with essential oil reservoirs and close clearances between your rotors and housing are additional attributes that define a dry vacuum pump.

Principle of Operation

Dried out screw vacuum pumps operate with two screw rotors rotating in reverse directions. This traps the medium to be pumped between the cylinder and the screw chambers and transports it to the gas discharge. … It also results in a lower heat load of the compressed gas.