The definition of a dry vacuum pump is a pump that does not use any fluids to make a vacuum or contact the process gas and will also discharge to atmosphere. … Timing gears with oil reservoirs and close clearances between your rotors and housing are extra attributes that define a dried out vacuum pump.
Principle of Operation
Dry screw vacuum pumps operate with two screw rotors rotating in opposing directions. This traps the medium to end up being pumped between the cylinder and the screw chambers and transports it to the gas discharge. … It also results in a lower warmth load of the compressed gas.