PUMPS - Centrifugal,Gear,Screw & Vaccum

A  peristaltic pump  is a type of positive displacement pump used for pumping a variety of fluids. The fluid is contained within a flexible tube fitted inside a circular pump casing (though linear peristaltic pumps have been made). A  rotor  with a number of "rollers", "shoes", "wipers", or "lobes" attached to the external circumference of the rotor compresses the flexible tube. As the rotor turns, the part of the tube under compression is pinched closed (or "occludes") thus forcing the fluid to be pumped to move through the tube. Additionally, as the tube opens to its natural state after the passing of the cam ("restitution" or "resilience") fluid flow is induced to the pump. This process is called peristalsis and is used in many biological systems such as the gastrointestinal tract. Typically, there will be two or more rollers, or wipers, occluding the tube, trapping between them a body of fluid. The body of flui...

A  diaphragm pump  (also known as a  Membrane pump ,  Air Operated Double Diaphragm Pump  (AODD) or  Pneumatic Diaphragm Pump ) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid. There are three main types of diaphragm pumps: Those in which the diaphragm is sealed with one side in the fluid to be pumped, and the other in  air  or hydraulic fluid. The diaphragm is flexed, causing the volume of the pump chamber to increase and decrease. A pair of non-return check valves prevent reverse flow of the fluid. [1] Those employing volumetric positive displacement where the prime mover of the diaphragm is electro-mechanical, working through a crank or geared motor drive, or ...

Lobe pumps  are used in a variety of industries including pulp and paper,  chemical ,  food ,  beverage , pharmaceutical , and  biotechnology . They are popular in these diverse industries because they offer superb sanitary qualities, high efficiency, reliability, corrosion resistance and good clean-in-place and steam-in-place (CIP/SIP) characteristics. Rotary pumps can handle solids (e.g.,  cherries  and  olives ), slurries, pastes, and a variety of  liquids . If wetted, they offer self-priming performance. A gentle pumping action minimizes product degradation. They also offer continuous and intermittent reversible flows and can operate dry for brief periods of time. Flow is relatively independent of changes in process pressure, too, so output is relatively constant and continuous. How lobe pumps work [ edit ] lobe pump internals Lobe pumps are similar to external  gear pumps  in operation in that fluid flows...

A  submersible pump  (or  sub pump, electric submersible pump  (ESP)) is a device which has a  hermetically sealed   motor  close-coupled to the pump body. The whole assembly is submerged in the fluid to be pumped. The main advantage of this type of pump is that it prevents  pump cavitation , a problem associated with a high elevation difference between pump and the fluid surface. Submersible pumps push fluid to the surface as opposed to jet pumps having to pull fluids. Submersibles are more efficient than  jet pumps . One style of submersible pump for industrial use. Outlet pipe and electrical cable not connected. Contents    [ hide ]  1   Working principle 2   Applications 3   Use in oil wells 4   Cables 5   See also 6   References 7   External links Working principle [ edit ] The submersible pumps used in ESP installations are multistage centrifugal pumps operat...