POSITIVE DISPLACEMENT PUMPS
A Positive Displacement Pump has an expanding cavity on the suction side and a decreasing cavity on the discharge side. Liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. The volume is a constant given each cycle of operation.Type your paragraph here.
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.
Positive displacement pumps are typically used for pumping viscous liquids and are ideal for long runs with continuous flow. These pumps typically do not produce high flow rates, but can produce higher pressures than other pump types. The flow in a positive displacement pump won’t change when the pressure increases.
Progressive Cavity Pumps