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Understanding Hydraulic Pumps

The pump is that component of the hydraulic circuit that converts mechanical energy into hydraulic pressure, which in turn produces force in the cylinder. The mechanical energy can be supplied by hand, by an electric motor, or by air pressure. Used less often are gasoline driven internal combustion engine pumps. Hydraulic pumps are classified under the broad category of pumps known as positive displacement. Positive displacement (PD) pumps can produce fluid pressure either by rotating meshing gears of by piston action. Sometimes in the case of two-stage pumps, both gears and pistons are utilized. PD pumps require a provision of over-pressure protection. The discharge pressure of hydraulic pumps has been standardized at 10,000 psi (pounds per square inch).


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