Positive Displacement Pump

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Master Pumps Product Training Session III is an introduction to Positive Displacement (PD) pumps, and in particular, Rotary pumps. 1 By definition, Positive Displacement (PD) pumps displace a known quantity of liquid with each revolution of the pumping elements. This is done by trapping liquid between the pumping elements and a stationary casing. Pumping element designs include gears, lobes, rotary pistons, vanes, screws and hoses. 2 Positive Displacement Pump Applications Chemical-processing Liquid Delivery Marine Biotechnology Pharmaceutical Food Dairy Beverage Processing 3 Positive Displacement Advantages Versatile Compact Design High-Viscosity Performance Continuous Flow Regardless of Differential Pressure Ability to Handle High Differential Pressure 4 Rotary Pump Family Tree Positive Displacement (PD) pumps are divided into two broad classifications, Reciprocating and rotary PD Pumps displace a known quantity of liquid with each revolution PD Pumps displace liquid by creating a space between the pumping elements and trapping liquid in the space The rotation reduces the size and space and moves the liquid out of the pump 5 PD Pumps handle fluids up to 1,320,000 centistokes or 6,000,000 SSU (Refer to page 611 in the 2008 Master Pump Catalog) Capacities up to 1,150 M3 / HR / 5,000 GPM Pressures up to 700 BAR / 10,000 PSI Rotary Pumps are self-priming and deliver a constant, smooth flow regardless of pressure variation. 6 Internal Gear Carries fluid between the gear teeth from the inlet to outlet ports The outer gear (rotor) drives the inner or idler gear on a stationary pin The gears create voids as they come out of mesh and liquid flows into the cavities The volume is reduced and the liquid is forced out of the discharge port as they come back into mesh The crescent prevents liquid from flowing backwards from the outlet to

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