We have 4 nos of servovalves each for 4 governing valves.one pump pressure is stable.we have replaced all filters in line as well as oil in tank also replaced by fresh oil.individual pumps are having inbuilt presuure regulating cum flow control unit.we have tried stabilizing pressure by regulating by this inbuilt system but failed many times.actuator was also charged with n2 to adequate pressure.discharge side check valves have been checked.Eh oil, eh? Do you mean electro-hydraulic oil? (Oil used in hydraulic systems the flow-rate and direction of which is controlled by electro-hydraulic servo valves or something similar?
You say the pressure from one pump is unstable. Is the pressure from the other pump unstable also?
Do the pumps have their own built-in pressure regulator?
Is the pump pressure regulator external to the pump(s)?
Is there an accumulator in the system? If so, is it properly charged and are the block and bleed (isolation and drain) valves in the proper positions?
Is there some hydraulically-operated device which is also experiencing fluctuations in position or flow or pressure control?
Are you sure the pump suction is not plugged and has a "free" access to oil?
Are the Eh pump suctions pressurized by some upstream pump? If so, is the upstream pump working properly?
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by Jeff Kerns