A-VBSO-SE30-FC1 Single Counterbalance Valve.pdf

When pressure at V2 rises above the spring bias pressure,  the check seat is pushed away from the piston and flow is  allowed from V2 to C2. When load pressure at C2 rises  above the pressure setting, the direct operated relief  function is activated and flow is relieved from C2 to V2.  With pilot pressure at V1-C1, the pressure setting is  reduced in proportion to the stated ratio of the valve, until  opening and allowing flow from C2 to V2. The spring  chamber is drained to V2, and any back-pressure at V2 is  additive to the pressure setting in all functions. For safety  and compactness, the C2 port is gasket mounted the  actuator.

当V2入口处的压力逐渐升高超过弹簧（单向阀部分）的设定压力时，单向阀的阀座将被推往远离活塞的方向，从而使油液从V2进入C2。当负载压力，即C2回油压力升高超过压力设定时，直动式溢流功能被激活，C2到V2油口的油液被缓慢释放。V1至C1的先导油压力，逐渐升高，并根据先导比打开C2至V2的流道。