The output pressure of the pump is determined by the load, and approximately proportional to the input torque. There are two fault output abnormal pressure. (1) The output pressure is too low when the pump is self-priming in the state, if the inlet line or system leak hydraulic cylinders, check valves, valve and so have a greater leakage, all the pressure will not rise up. This need to find the leak at the pump, tighten, replace the seals, it can increase the pressure. Adjust the pressure relief valve is faulty or low hydraulic distribution, system pressure do not increase, readjust the pressure relief valve or repair. If the hydraulic cylinder and valve plate bias caused large spills, severe pump maintenance, the cylinder may rupture, you should re-ground mating surfaces or replace the pump. (2) The output pressure is too high if the loop load continues to rise, the pump pressure has continued to grow, comes as normal. If the load is constant, the pump pressure exceeds the pressure value required by the load, you should check the outside of the pump hydraulic components, such as directional valves, pressure valves, actuators and return oil pipes. If the maximum pressure is too high, adjust the relief valve. Achieved by the injection molding machine hydraulic system to the pump control valve controlled transition, so that conventional throttle speed control system into a proportional speed control system pump repair, control performance machine with new improvements and enhancements. Specifically, the proportion of variable displacement pump system in addition to the advantages of the conventional proportional control system, but also has the following advantages: the same power of the machine, the injection speed can be increased by more than 25%, more adapted to the requirements of thin-walled precision injection. Since ordinary PQ system power calculations to dwell state standards, the proportion of variable pump system at the time of this operation is very low power consumption, and thus pump displacement can increase more than 25%; reduce system heat, extend the service life of hydraulic components. Almost no throttling proportional variable system, overflow losses, the system is running fever greatly reduced. Not only save cooling water consumption, low oil sealing element life is greatly improved; reduce energy consumption, improve system efficiency; pump maintenance _ _ Jing Chong hydraulic pump preferred by the Jinan Jing Chong Hydraulic Machinery Limited. Jinan Jing Chong Hydraulic Machinery Co., Ltd. (www.jnjcyy.com) (www.jnjcyy.com) strong, credible, in Jinan, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead crystal create hydraulic and you hand into the brilliant, for a better future!