Positive displacement pumps are available in a wide variety such as gear, lobe, piston, diaphragm, peristaltic, screw, progressive cavity, hydraulic and many others. Their advantages are:
Positive Displacement pumps operate by using a rotary, reciprocating, or diaphragm method of drawing fluid into the pumping chamber at the inlet and pushing it through a discharge outlet. Positive Displacement pumps move fluid at a constant rate regardless of pressure conditions, and they are typically the preferred choice for low to moderate flow rates at higher discharge pressures.
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Viking Pump Internal Gear – Cutaway
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Liquiflo Centrifugal Pump Selection
Neptune diaphragm metering pumps are used for reliable chemical dosing for almost any industry and are available for high and low pressure applications with manual and electronic stroke control for precise product metering. Additional accessories from Neptune include mixers, injection quills and sample coolers, just to name a few.