Pilot check valves are used to block the cylinder in both directions. Flow is free in one direction and blocked in the reverse direction until pilot pressure is applied. Face mounting enables assembly directly onto the cylinder.

先导式液压锁用于在进油、回油两个方向上锁住油缸。当先导油液没有施加在对侧方向的回路时，油液正向自由流动，反向截止，即为单向阀功能。当先导油液施加在对侧回路时，则正向、反向均可流动。板式安装的方式可以更佳方便的安装在油缸上。（需要做底板）

Description 概述

Flow is allowed to pass in one direction(V1toC1orV2toC2),then the valve remains closed (checked) in both reverse directions (C1 to V1 or C2  to V2) in order to hold and lock in position the cylinder or other actuators; reverse fow is possible only when suffcient pilot pressure is applied at V2 or V1, which act as cross connected pilot ports, and the pilot piston lifts the poppet from its seat overcoming cylinder port pressure. For better safety and compact assembly, C1 and C2 ports are fanged (gasket mounted) directly on the actuator.

允许油液单向通过（V1 至 C1 或 V2 至 C2），然后液压锁在两个反向（C1 至 V1 或 C2 至 V2）上保持关闭（锁止），以保持和锁定油缸或其他执行机构的位置；只有在 V2 或 V1（作为交叉连接的先导口）上施加足够的先导压力，先导活塞克服油缸压力将阀芯从阀座上抬起时，才可能实现反向流动。为了提高安全性和紧凑装配，C1 和 C2 端口直接安装在执行机构上。