Unique Original Articles » Heat problem while using hydraulic test stands

In a typical test stand, all of the horsepower put into the system by the pressurized oil flow should be converted into heat by the relief valve or flow valve. The oil is forced through the relief valve at high velocity. The resulting friction converts the hydraulic power to heat to the tune of 746 Watts / hour per horsepower. This adds 42.42 BTU/minute per horsepower into the hydraulic system. A 100 horsepower system would put 4242 BTU per minute into the oil reservoir, or 254,320 BTU/hour. A 100 horsepower system would quickly increase the reservoir’ temperature, only in 6 to 12 minutes exceeding 160 degrees.
A hot reservoir will be slow to dissipate heat to the surrounding work area, limiting the number of pumps to test daily. Oil coolers are often needed on test stands in order to remove Excess heat so the pump test stand can operate throughout the workday. Heat must be controlled or the hydraulic system of the test stand and the pump being tested would fail. The high temperatures will degrade the seal materials and cut the life of the seals. High temperatures will bring a ruining consequence on the oil viscosity and oil life. High oil temperature thins out oil, reducing the efficiency
To learn more about hydraulics: Hydraulic Force/position control using digital servo-actuatorsLook at more information about this:List of hydraulic seals materials
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