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 push extends them from their Industrial Vacuum Pumps person slots, forming compression cellular material that get larger to draw air flow in from the intake and smaller to push atmosphere out the exhaust.
Articulated piston: An articulated piston commercial vacuum pump works in a manner similar to that of an automobile engine. 
As the piston moves downward inside the cylinder, surroundings is used through the intake valve. During the piston’s upward stroke, the surroundings is permitted to flee 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 carefully turn in reverse directions, which in turn causes the compression actions that occurs. The gas is compressed in direction of the pump’s discharge slot.
Liquid ring: Liquid ring pumps also operate via positive displacement. During operation, the pump’s impeller rotates in the pump casing. A rotating liquid ring then seals the impeller and its blades. Liquid is sucked in to the compression chamber to keep carefully the ring stable. Conveyed gas is definitely compressed during each impeller revolution.
Claw: Claw vacuum pumps contain two rotors that are very close but usually do not come in contact with each other during rotation. As the rotors turn they physically enlarge the space between them to draw in air, then because they rotate around, physically reduce the space between them to compress the atmosphere out from the chamber.