Hey, I have a hydraulic press which
Hey, I have a hydraulic press which
(OP)
Hey, I have a hydraulic press which requires lubrication at the guides. The hydraulic power unit supplying the lubricant seems to have lost pressure. The current pump and electric motor ratings are pump's max pressure is 100bars, 2.5ltr/m while the motor is a 3 phase 0.37kw. I bought a bigger capacity pump which was readily available with a motor capacity of 1.5 kw and the pressure is too much to the system have tried to adjust the pressure relief valve without success. Any advice on what how to reduce pressure.
RE: Hey, I have a hydraulic press which
100 BAR @ 2.5 LPM = 0.416kW and that's at 100% efficiency.
If you take the standard 85% overall efficiency that most systems have, then your motor power would need to be 0.49kW. This suggests that the original 0.37kW motor is too small, or your figures for the flow and/or pressure are not right.
Where is the pressure measured and where is the relief valve in relation to the pump? The relief valve may be positioned to limit the system pressure rather than to limit the pump pressure.
If you measure the pressure at the pump, the relief valve is far away from the pump, possibly at the end of a branch line, then your pump pressure will always be high and backing the relief valve off may not have the effect you were hoping for.
A simple hand sketch will suffice...
What did you do to adjust the relief valve?
RE: Hey, I have a hydraulic press which
HPost, I think OP listed the max pressure (at minimum RPM) and max flowrate (at minimum operating pressure) - you wouldn't run under these conditions siumltaneously, since your max flowrate will always be at minimum pressure. Realistically, I'd expect something closer to 0.8LPM at 100 bar operating pressure.
RE: Hey, I have a hydraulic press which
Mike Halloran
Pembroke Pines, FL, USA