![]() As the motion of the piston reverses, the inlet valve, now under pressure, is closed and the outlet valve opens allowing the fluid contained in the piston chamber to be discharged (the compression phase). In a piston pump, the first stroke of the piston creates a vacuum, opens an inlet valve, closes the outlet valve and draws fluid into the piston chamber (the suction phase). Reciprocating positive displacement pumpsĪ Reciprocating Positive Displacement pump works by the repeated back-and-forth movement (strokes) of either a piston, plunger or diaphragm (Figure 1). How does a positive displacement pump work?Īlthough there are a wide variety of pump designs, the majority can be placed into two categories: reciprocating and rotary. The pumping action is cyclic and can be driven by pistons, screws, gears, rollers, diaphragms or vanes. As your centrifugal pump supplier in Canada, our experts are on hand to help you choose, install, maintain, and monitor a variety of equipment, whether it’s positive displacement, centrifugal or other.Useful information on positive displacement pumps What is a positive displacement pump?Ī positive displacement (PD) pump moves a fluid by repeatedly enclosing a fixed volume and moving it mechanically through the system. The pump you choose should help your system perform at peak efficiency, not reduce its performance. Positive displacement pumps can run at lower speeds and at lower shear rates than centrifugal pumps. When a PD pump handles higher viscosity fluids, flow rates increase as the high viscosity liquid fills the pump’s clearances – increasing efficiency. When to choose a positive displacement pump insteadįor highly viscous fluids, a better option might be a positive displacement pump. We’ve seen centrifugal pumps manage viscosities of up to 1000 cP, but this impacts the performance of the pump. The higher the viscosity, the less efficient the pump will be. Here’s two things to consider:Ī centrifugal pump shaft has a torque and horsepower limit that will be negatively impacted as viscosity increases. If your application is above 250, we suggest working with your pump manufacturer (or your centrifugal pumps supplier in Canada) to see if a centrifugal pump would be correct for the pumped fluid. ![]() What viscosity can a centrifugal pump handle?ĭepending on size of the pump and geometry of the impeller, viscosity limits range from 100 to 700 cP in most centrifugal pumps in Canada.
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