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18

Three Options To Consider When Selecting a Hydraulic Pump

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Three Options To Consider When Selecting a Hydraulic Pump

Many factors come into play when selecting a hydraulic pump for a circuit.  Main factors in this decision are often application, installation setting, and cost.  When taking cost into account, sticker price is often the only thing that is considered.  However, the cost of operation and efficiency also need to be considered.  Piston pumps have three options that can make a hydraulic system more efficient, and save money in the long run.

The most basic option that can save energy is pressure compensation on a variable displacement piston pump.  A piston pump with pressure compensation allows the pump to de-stroke when pressure is built up in a hydraulic system.  A pressure compensator works by using an internal sensing line that transmits fluid pressure from the outlet of the pump.  If this pressure is higher than what the pressure compensator is set for then it will de-stroke the pump reducing the output flow.

Most variable displacement piston pumps with pressure compensation offer a second option called Load Sense.  Load Sense is a system that allows for the pump to come to an idle state when pressure and flow are not needed.  This idle state helps save energy by reducing the amount of horsepower the electric motor needs to provide to the hydraulic pump.  This is made possible by installing a pilot line to transmit pressure from near actuator to the pump.  This pressure moves an actuator inside the pump that allows for the pump to provide the necessary power.  Load Sense is especially useful in applications where there is a long period of down time in between system cycles.

Torque limiting is yet another energy saving option on a piston pump.  Torque limiting is useful in operations that require high pressure and high flow, but not simultaneously.  Torque limiting allows the pump to provide either very high pressure with a low flow rate, or relatively low pressure with a high flow rate.  Once again the signal to control the pump must be received from fluid pressure downstream via pilot line.  This can cut the peak horsepower for an operation, and allow for a smaller prime mover to be used.

All of these sensing options can also be accomplished by using electro-hydraulics, or by using electro-hydraulics in conjunction with these specified options.

For more information on variable displacement piston pumps check out Eaton's website here:

» Click here for Eaton's Hydraulic Pumps Page 

Posted in: Expert Tips | Tags: Eaton , hydraulic , pumps , energy-efficiency | Comments (0) | View Count: (5519)
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