Quantcast Principle  of  Operation

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Pumps DOE-HDBK-1018/1-93 POSITIVE DISPLACEMENT PUMPS Principle  of  Operation All positive displacement pumps operate on the same basic principle.  This principle can be most easily demonstrated by considering a reciprocating positive displacement pump consisting of a single reciprocating piston in a cylinder with a single suction port and a single discharge port as shown in Figure 12.   Check valves  in the suction and discharge ports  allow flow in only one direction. During the suction stroke, the piston moves to the left, causing the check valve in the suction Figure 12   Reciprocating Positive Displacement Pump Operation line between the reservoir and the pump cylinder to open and admit water from the reservoir. During the discharge stroke, the piston moves to the right, seating the check valve in the suction line  and  opening  the  check  valve  in  the  discharge  line.   The  volume  of  liquid  moved  by  the pump in one cycle (one suction stroke and one discharge stroke) is equal to the change in the liquid volume of the cylinder as the piston moves from its farthest left position to its  farthest right position. Reciprocating  Pumps Reciprocating positive displacement pumps are generally categorized in four ways: direct-acting or indirect-acting; simplex or duplex; single-acting or double-acting; and power pumps. Rev. 0 ME-03 Page 19


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