Fisher 377 pressure‐sensing trip valves are for control
applications where a specific valve/actuator action is
required when supply pressure falls below a specific
point. When supply pressure falls below the trip point
(see figure 1), the trip valve causes the actuator to fail
up, lock in the last position, or fail down. When the
supply pressure rises above the trip point, the 377 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. 377 trip valves can be used with Fishe