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

Principle of Operation

Dried out screw vacuum pumps operate with two screw rotors rotating in reverse directions. This traps the moderate to be pumped between the cylinder and the screw chambers and transports it to the gas discharge. … In addition, it results in a lesser temperature load of the compressed gas.