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原文
Plunger valve output pressure anomaly Valve output pressure is determined by the load, approximately proportional to the input torque. There are two fault output abnormal pressure. (1) plunger valve output pressure is too low When the valve is self-priming condition, or if the system into the oil pipeline leak in the hydraulic cylinder, one-way valves, valve leakage, which are larger, are the pressure will not rise up. This need to identify the leak Department, tighten, replace the seals, you can increase the pressure. Adjust the pressure relief valve is faulty or low pressure do not increase the system should re-adjust the pressure relief valve or repair. If the hydraulic valve block and valve plate bias caused by large spills, severe, cylinder may rupture, with the surface should be re-grinding or replacement of hydraulic valves. (2) high pressure plunger valve output If the circuit loads continue to rise, the pressure valve has continued to grow, comes to normal. If a certain load, the valve pressure exceeds the pressure required by the load value, you should check the outside of the hydraulic valve components, such as the direction of the valve, pressure valve, transmission and oil return pipe. If the maximum pressure is too high, you should adjust the relief valve.
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译文：
　　阀的输出压力是由负载决定的，与输入转矩近似成正比。输出压力异常有两种故障。　　(1)柱塞阀输出压力过低　　当阀在自吸状态下，若进油管路漏气或系统中液压缸、单向阀、换向阀等有较大的泄漏，均会使压力升不上去。这需要找出漏气处，紧固、更换密封件，即可提高压力。溢流阀有故障或调整压力低，系统压力也上不去，应重新调整压力或检修溢流阀。如果液压阀的缸体与配流盘产生偏差造成大量泄漏，严重时，缸体可能破裂，则应重新研磨配合面或更换液压阀。　　(2)柱塞阀输出压力过高　　若回路负载持续上升，阀的压力也持续上升，当属正常。若负载一定，阀的压力超过负载所需压力值，则应检查阀以外的液压元件，如方向阀、压力阀、传动装置和回油管道。若最大压力过高，应调整溢流阀。

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