自动卸荷的工作过程 :如图 1所示 ,泵为自动卸荷状态。当喷枪关闭时 ,阀芯在液压力Ｆ的作用下而向下移动至止推面 ,这时阀芯 4上的环形槽ｄ使卸荷回路ｃ与吸入进口ｂ构成通路同时将至喷枪的通路堵住。这时清洗泵的出口与吸入口构成了无阻通路 ,达到了自动卸荷之目的。作用在阀? Automatic unloading process: As shown in Figure 1, the pump is automatically unloaded state. When the gun is closed, the spool moves downward to the thrust surface under the action of the hydraulic force F. At this time, the annular groove d on the valve core 4 causes the unloading circuit c and the suction inlet b to form a passage and at the same time, Blocked. At this time, the outlet of the cleaning pump and the suction port form an unobstructed path, achieving the purpose of automatic unloading. Role in the valve?