Rotary Positive Displacement Pumps
October 2002
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The company's rotary positive displacement pumps, using gear and lobe principles, are said to offer an alternative to centrifugal pumps in applications where system pressure or fluid viscosity fluctuates. In comparison with centrifugal pumps, where flow rates often change and efficiency is lost, these positive displacement pumps provide a near-constant flow rate with minimal efficiency change, regardless of changes in system pressure or viscosity, according to the supplier.

The company's high NPSHR capabilities are said to keep fluid moving with less chance of cavitation in processes where a suction lift is required or where a high vapor pressure fluid is being pumped. And, while centrifugal pumps can handle fluids to about 2,500 SSU (550 cSt) viscosity, the pumps can handle fluids from 28 to 2 million SSU (1-440,000 cSt) viscosity. They are also said to feature low shear, reversible direction of flow, low pulsation, and high mechanical efficiency.

Viking Pump, a unit of IDEX Corporation

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