Rotary vane: Rotary vane pumps are comprised of a number of vanes that are mounted to a rotor that turns in the cavity. As the vanes rotate, centrifugal push extends them from their person slots, forming compression cells that get larger to draw air flow in from the consumption and smaller to push air out the exhaust.
Industrial Vacuum Pumps Articulated piston: An articulated piston commercial vacuum pump works in a way similar to that of a car engine. As the piston moves downward inside the cylinder, surroundings is drawn in through the consumption valve. Through the piston’s upward stroke, the air flow is permitted to flee via an exhaust valve. Two spring-backed piston bands 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 carefully turn in reverse directions, which causes the compression actions to occur. The gas is compressed in 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 ring after that seals the impeller and its blades. Liquid can be sucked in to the compression chamber to keep carefully the ring steady. Conveyed gas is usually compressed during each impeller revolution.
Claw: Claw vacuum pumps contain two rotors that are very close but do not are exposed to one another during rotation. As the rotors change they actually enlarge the space between them to attract air, then as they rotate around, actually reduce the space between them to compress the air out of the chamber.