When supply pressure falls below the trip point the trip valve causes the actuator to fail up, lock in the last position, or fail down. Fail up or down requires the inclusion of a volume bottle to provide alternative supply for failure situations. When the supply pressure rises above the trip point, the 377 Series trip valve automatically resets, allowing the system to return to normal operation. The trip valve can be top-mounted on a manifold, yoke-mounted, or bracket-mounted to match the application requirements.
This valve is most typically used in conjunction with double acting piston actuators and volume bottles. The 377 can also be used with spring return actuators when lock in last failure condition is requested.