液压泵工作压力是指泵（或马达）在实际工作时输出（或输入）油液的压力，由外负载决定。
The working pressure of hydraulic pump refers to the pressure of output (or input) oil of the pump (or motor) in actual operation, which is determined by the external load.
额定压力是指在正常工作条件下，按试验标准规定能连续运转的最高压力。其大小受寿命的限制，若超过额定压力工作，泵（或马达）的使用寿命将会比设计的寿命短。当工作压力大于额定压力时称超载。
Rated pressure refers to the highest pressure that can be continuously operated under normal working conditions according to test standards. The size of the pump is limited by its service life. If it works under rated pressure, the service life of the pump (or motor) will be shorter than that of the design. When the working pressure is greater than the rated pressure, it is called overload.