一、响应时间先导型溢流阀的作用原理如图1。K_1为主阀A刚能开启时的弹簧压力,K_2为先导阀B刚能开启而使阀腔2与回油孔道沟通时的弹簧压力。若稳态时的系统压力为P_N(即溢流阀的调定压力),则当溢流阀关闭时阀腔1、2的压力均为P_N。如在某一瞬时由于荷载变化而使系统压力增至P,即P>P_N时,则阀腔1的压力变为P;同时因油流通过主阀芯上节流孔的效应,所以阀腔2的压力变为P_2。 First, the response time Pilot-operated relief valve principle shown in Figure 1. K_1 is the spring pressure when the main valve A can be opened, and K_2 is the spring pressure when the pilot valve B can be opened to make the valve chamber 2 communicate with the oil return hole. If the system pressure at steady-state P_N (relief valve setting pressure), then when the relief valve is closed when the valve chamber pressure P_N are P_N. If at some instant the system pressure increases to P due to load changes, ie P> P_N, then the pressure in the valve chamber 1 becomes P; and at the same time the oil flow passes through the orifice of the main valve plug, 2 pressure becomes P_2.