Rotary vane: Rotary vane pumps are comprised of a series of vanes that are mounted to a rotor that turns inside a cavity. As the vanes rotate, centrifugal force extends them from their individual slots, forming compression cells that get bigger to draw atmosphere in from the consumption and smaller to force surroundings out the exhaust.
Articulated piston: An articulated piston commercial vacuum pump operates in a manner similar compared to that of a car engine. As the piston movements downward within the cylinder, air is used through the consumption valve. Through the piston’s upward stroke, the atmosphere is permitted to escape via an exhaust valve. Two spring-backed piston rings are accustomed to seal the piston to the cylinder.
Screw: Rotary screw pumnps include two parallel rotary screws in the pump casing. The screws are synchronized to turn in reverse directions, which causes the compression actions to occur. The gas is compressed in 
the direction of the pump’s discharge interface.
Liquid ring: Liquid ring pumps also operate via positive displacement. During operation, the pump’s impeller rotates inside the pump casing. A rotating liquid ring then seals the impeller and its own blades. Liquid is usually sucked in to the compression chamber to keep the ring stable. Conveyed gas can be compressed during each impeller revolution.
Claw: Claw vacuum pumps contain two rotors that are very close but usually do not are exposed to one another during Industrial Vacuum Pumps rotation. As the rotors switch they actually enlarge the area between them to attract air, then as they rotate around, physically decrease the space between them to compress the air out of the chamber.
