Regarding the severe drop in hydraulic system pressure due to rising temperature
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The equipment is primarily used to control the impact on vane pumps; the typical pressure is 17 MPa, and there are no issues at temperatures below 50°C. When the temperature exceeds this value, the pressure drops significantly. Older type of transmission fluid is used, as the equipment itself is also old. I’m not sure about the reason for this pressure drop; a simple hydraulic schematic is attached. I seek advice from experts; thank you!
As the temperature rises, the viscosity of the oil decreases. The oil pump cannot supply oil to the system properly. That’s probably the reason.
But the pressure is clearly not right; it doesn’t even reach 7 MPa at 100 degrees
Gas stations generally need to be equipped with filters and coolers. Oil temperature also has a temperature indicator. These situations need to be considered.
As the temperature rises, the viscosity of the oil decreases, leading to increased internal leakage. Consider cooling the oil down, or try using a different grade of oil.
The Shell transmission fluid is just a bit old; there’s no issue with pressure at 120°C for other equipment. Could it be a problem with the equipment’s hydraulic system?