A reciprocating pump utilizes a crankshaft-connecting rod mechanism identical to internal combustion engines. The crankshaft-connecting rod mechanism converts the rotary movement of the crankshaft to a reciprocating linear movement of plungers or pistons. The plunger/piston movement creates volume changes.AdvertisementAs a cavity opens when a plunger/piston retracts, the fluid is admitted through an inlet check valve. When the plunger/piston reverses, the inlet check valve closes, and the cavity reduces when the plunger/piston extends. The outlet check valve opens and the fluid is forced out by the plunger/piston.The discharge volume is fixed for each crankshaft revolution, regardless of the fluid being pumped. Pressure is determined by the system flow resistance and pump construction (see Figure 2). Speed reduction is needed for decreasing high speed from the driver to low pump shaft speed.- See more at: http://www.pumpsandsystems.com/topics/pumps/reciprocating-pumps/reciprocating-pumps-vs-multi-stage-centrifugal-pumps#sthash.1afJ6g8j.dpuf
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