Positive Displacement Pumps

Positive displacement pumps use a mechanical force such as gears, bladders, pistons, plungers or diaphragms to push liquid through and out of the pump. They moved fluid into a fixed cavity so that when the liquid exits, the vacuum that is created draws in more fluid. Positive displacement pumps are suitable for liquids with high viscosities and for applications that require high pressures. Typically, these self-priming devices are made of aluminum, brass or bronze, cast iron, plastic, or stainless steel. Positive displacement pumps are used in a variety of industrial, commercial, and municipal applications. For example, they are often used in the construction, maritime, mining, petrochemical, pulp and paper, and power generation industries. Pumps that are rated for petrochemical and hydrocarbon applications are designed to move materials such as gasoline, kerosene, diesel oil, lubricating oil, paraffin wax, and asphalt. Pumps that can operate at 10,000 to 40,000 psi are used in surface preparation, the internal cleaning of pipes and heat exchangers, and concrete removal.

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