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Positive displacement pumps, such as the diaphragm, screw and rotary pumps, are designed to reduce contact between moving parts and the pumping fluid. This allows them to handle abrasive or shear-sensitive substances better, a beneficial characteristic for sectors like mining or chemical processing.
Unlike dynamic pumps, which rely on kinetic energy to move fluids, positive displacement pumps work by creating a sealed chamber that enlarges and contracts to move the fluid. This mechanism allows them to provide a constant flow rate regardless of the discharge pressure or system resistance.
Positive displacement pumps add energy to a fluid by applying force to the liquid with a mechanical device such as a piston or plunger. A positive displacement pump decreases the volume containing the liquid until the resulting liquid pressure equals the pressure in the discharge system.
A Positive Displacement Pump, unlike a Centrifugal or Roto-dynamic Pump, will produce the same flow at a given speed (RPM) no matter the discharge pressure. A Positive Displacement Pumps is a " constant flow machine "
16 Φεβ 2007 · Positive Displacement Pumps Table of Contents 100.0 INTRODUCTION 1 200.0 EXTENDED DEFINITIONS OF MAJOR TERMS, WITH EXPLANATIONS, CONVERSION FACTORS, AND NOMENCLATURE 3 200.1 Positive Displacement Pump 3 200.2 Fluid versus Liquid 3 200.3 Flow 3 200.4 Pressure 3 200.5 Net Positive Inlet Pressure (NPIP) 3 200.6 Power 4 200.7 Efficiency 4
Positive displacement pumps are a category of pumps designed to move fluid at a steady rate through a system. These pumps are able to handle viscous fluids, which flow at lower speeds and create more resistance, more efficiently than kinetic (dynamic) pumps.
Positive displacement pumps are primarily used in systems requiring pressurised water and oil (pressure pump) in the chemical industry (e.g. dosing pump) and frequently also on board vessels and in small and medium-sized industrial plants.
