Reciprocating Vacuum Pump Another product from our vast range of high-precision vacuum pumps is the reciprocating vacuum pump. Reciprocating vacuum pump is used to discharge a low volume of liquid at high pressure. The liquid is collected in an enclosure/cavity and a plunger or piston creates a positive displacement in the cavity to discharge the liquid at a high pressure. Vacuum Pumps are useful in paper handling, Liquid transfer, vacuum foarming, food processing, sugar factory, food impregnation, hospitals & dental clinics, laboratories, dairies, chemical industry, etc.