液压机系统保压、泄压性能优劣,是考核和评价液压机性能的重要指标。尤其是它的泄压程度的充分与否,影响着机器的振动、噪声以及液压系统的使用寿命。在液压机械中用保压、泄压的液压系统型式较多,但以液控单向阀的系统最为普遍(如图1所示)。这种系统不仅保压、泄压的性能较好,而且系统简单、机械可靠。用在小液压机上优势尤为突出。可是,如果不改进设计,将其用在大、中型液压机上,就难以达到理想 Hydraulic system packing, pressure relief performance pros and cons, is to assess and evaluate the hydraulic performance of an important indicator. In particular, its adequacy of pressure relief, affecting the vibration of the machine, noise and hydraulic system life. In the hydraulic machinery with packing, pressure relief of the hydraulic system more, but the pilot-operated valve system is the most common (shown in Figure 1). This system not only packing, pressure relief better performance, and the system is simple, reliable machinery. The advantages of using a small hydraulic machine is particularly prominent. However, if you do not improve the design, its use in large and medium-sized hydraulic press, it is difficult to achieve the desired