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 surroundings in from the consumption and smaller to drive air flow out the exhaust.
Articulated piston: An articulated piston industrial vacuum pump operates in a way similar to that of a car engine. As the piston techniques downward inside the cylinder, air flow is used through the intake valve. During the piston’s upward stroke, the atmosphere 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 Industrial Vacuum Pumps directions, which in turn causes the compression actions to occur. The gas is compressed in the direction of the pump’s discharge port.
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 can be sucked in to the compression chamber to keep the ring stable. Conveyed gas is certainly compressed during each impeller revolution.
Claw: Claw vacuum pumps contain two rotors that are extremely close but usually 
do not come in contact with each other during rotation. As the rotors convert they actually enlarge the area between them to draw in air, then as they rotate around, actually decrease the space between them to compress the air flow from the chamber.