... Technical parametersNominal pressure 31.5 MpaWorking medium 46~68# hydraulic oilAmbient temperature 5~35 FWorking oil temperature 88.7 ... shaft through the coupling rotation, the electric energy into hydraulic energy, the pump suction from the tank, high pressure ... proportion valve, drive tanks work. Proportional valve for the control cylinder liter reduction, was electric, the cylinder piston rod ...