Fisher 377 Pressure Sensing Trip Valve for Pneumatic Actuators

The Fisher 377 Pressure Sensing Trip Valve is a compact, rugged device designed to sense pressure levels and trigger a pneumatic actuator trip when a predefined setpoint is reached. Manufactured by Emerson, the 377 valve is commonly used in emergency shutdown (ESD) and fail-safe systems, ensuring immediate isolation of the process when safety thresholds are breached.

It can be used with both spring-return and double-acting actuators, and is widely applied in industries such as oil and gas, petrochemical, and power generation, where safety and rapid valve closure are critical.

• Pressure-sensing shutoff mechanism automatically trips actuators
• Adjustable pressure trip setpoints for custom system requirements
• Fail-safe pneumatic design requires no external power
• Compact, field-proven construction for harsh environments
• Works with Fisher control valves and other pneumatic actuators
• Compatible with emergency shutdown and venting systems
• Fast response time ensures maximum safety compliance

• Emergency shutdown systems (ESD/ESV)
• Compressor anti-surge protection
• High or low pressure trip systems
• Blowdown valve actuation
• Safety interlocks in refining and chemical plants
• Turbine and boiler protection systems