Paper weight need to check the solenoid valve

Paper weight more than in the case of normal oil pump, will pressure gauge is installed in the press paper pressure measurement point ( Pay attention to the pressure gauge pressure gauge switch must advance to show pressure) When there are two kinds of situation a. In the normally closed solenoid valve power state with a phillips screwdriver hold the normally open solenoid valve core, if the measured pressure can reach mpa ( By the location of the pressure regulating handle change) Indicates that the main oil pump working properly; If cannot reach or low pressure, the first thing to check the main pump oil outlet to the main pressure valve line and rule out whether there is a leak phenomenon, see below the normally open solenoid valve discharge tubing of oil discharge in a normally open solenoid valve core is pressed by unloading state can be blocked when to stop the oil discharge, if continue to have oil spilled, then normally open solenoid valve ball did not completely block oil, can remove the normally open solenoid valve check reason. If the main pump pipeline without leakage, normally open solenoid valve discharge tubing has stopped, the valve plate on the left side of the high pressure relief valve shall be opened, at the same time high pressure relief valve discharge tubing oil discharge. If high pressure relief valve discharge tubing and not out of oil, in the pipeline under the condition of no leak, we can determine the basic for the double vane pump main pump has been bad. b。 In the normally closed solenoid valve electric condition ( With his left hand holding the hydraulic box on the left side of the outside at the bottom of the stroke switch S) Right hand with a phillips screwdriver hold the normally open solenoid valve core, the paper cylinder pressure should rise, paper weight drops, at the same time, the pressure should be measured and normally closed electromagnetic valve of the same, then cutting paper weight not just because of reasons of electric. If the normally closed solenoid valve electric pressure significantly decreased after or paper weight cannot smoothly down, basic can determine the reason (for the inside of a pressure cylinder Such as spring, deformation, fracture or length shortens on steel ball valve core sealing is not good, etc. ) Oil leakage to the impact of pressure caused by.