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A positive displacement pump provides a constant flow at fixed speed, regardless of changes in pressure. The pump makes the fluid move by trapping a fixed amount and forcing the volume into the discharge pipe.
30 Μαΐ 2024 · Negative displacement pumps create a variable flow rate based on fluctuating centrifugal action, making them appropriate for applications such as irrigation or chemical transfer. Negative displacement pumps are typically lower maintenance than their positive counterparts.
Non-positive displacement pumps are velocity-type pumps that have a large clearance between rotating and stationary parts. They are used for transporting fluids over long distances, but they have low volumetric efficiency and are not self-priming.
14 Φεβ 2024 · A negative displacement pump is a type of pump that uses centrifugal force to move fluids or gases through the system. Unlike positive displacement pumps, which trap a fixed volume of fluid and push it out, negative displacement pumps draw fluid into an intake and seal it before ejecting it.
A positive displacement pump makes a fluid move by trapping a fixed amount and forcing (displacing) that trapped volume into the discharge pipe. Some positive displacement pumps use an expanding cavity on the suction side and a decreasing cavity on the discharge side.
For centrifugal pumps, NPSH values are expressed in units of specific energy (equivalent column height) such as feet or meters. For displacement pumps (rotary and reciprocating), NPSH values are normally expressed in pressure units such as pounds per square inch (psi), kilopascals, or bars. NPSH values are neither gauge
