Rotary vane: Rotary vane pumps are made up 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 individual slots, forming compression cells that get larger to draw atmosphere in from the intake and smaller to force surroundings out the exhaust.
Articulated piston: An articulated piston industrial vacuum pump operates in a way similar to that of an automobile engine. As the piston techniques downward in the cylinder, air flow is drawn in 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 accustomed to seal the piston to the cylinder.
Screw: Rotary screw pumnps include two parallel rotary Industrial Vacuum Pumps screws in the pump casing. The screws are synchronized to carefully turn in opposite directions, which causes the compression actions to occur. The gas is usually compressed in the direction of the pump’s discharge slot.
Liquid ring: Liquid ring pumps also operate via positive displacement. During procedure, the pump’s impeller rotates in the pump casing. A rotating liquid band after that seals the impeller and its own blades. Liquid is certainly sucked into 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 very close but usually do not come in contact with each other 
during rotation. As the rotors turn they actually enlarge the area between them to draw in air, then as they rotate around, physically decrease the space between them to compress the atmosphere out from the chamber.