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