Rotary vane: Rotary vane pumps are comprised of a series of vanes that are mounted to a rotor that turns in the cavity. As the vanes rotate, centrifugal force extends them from their person slots, forming compression cellular material that get bigger to draw air in from the intake and smaller to drive air out the exhaust.
Articulated piston: An articulated piston commercial vacuum pump functions in a way similar to that of an automobile engine. As the piston moves downward within the cylinder, air is drawn in through the intake valve. Through the piston’s upward stroke, the air 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 housing. The screws are synchronized to carefully turn in opposing directions, which causes the compression actions to occur. The gas is certainly compressed in the Industrial Vacuum Pumps direction of the pump’s discharge slot.
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 blades. Liquid is certainly sucked into the compression chamber to keep carefully the ring steady. Conveyed gas is definitely compressed during each impeller revolution.
Claw: Claw vacuum pumps contain two rotors that are very close but do not are exposed to each other during rotation. As the rotors switch they physically enlarge the space between them to attract air, then because they rotate around, physically decrease the space between them to compress the surroundings from the chamber.