Fi-sher 377 Pneumatic Pressure Trip Valve Control Valve Safety Device Valve Trip Valve

This single-unit trip valve simplifies systems that would otherwise need multiple switching valves. It features an adjustable trip point, large diaphragm areas, and few moving parts for reliable performance and long service life. Configurations include fail-down (377D), lock-in-last-position (377L), fail-up (377U), and directional fail modes. It can be manifold-, yoke-, or bracket-mounted and is compatible with various Fi-sher piston actuators.

Used in process control systems with pneumatic piston actuators where defined fail-safe action is required upon loss of air supply, including oil and gas, chemical, power, and general industrial applications.

Users may face issues with improper trip point setting, volume tank sizing for fail modes, or piping complexity in multi-valve setups. The 377 design reduces piping needs and allows easy mode conversion with minor hookup changes.

Serves as a direct or functional replacement for earlier Fi-sher trip valves or multi-valve trip systems requiring simplified fail-safe control.

We supply genuine Fi-sher / Em-erson products with experience in control valve accessories and reliable support for process applications.

Typical production and delivery time is 6-8 weeks.

Please provide actuator type, required fail mode, supply pressure, and mounting preference for a customized quotation.