The Fisher 377 Pressure Sensing Trip Valve is a robust, direct-operated safety device engineered to protect industrial processes from overpressure by automatically shutting off gas or liquid flow when a preset pressure threshold is exceeded. Designed for use in safety instrumented systems (SIS), it features a compact, inline construction with a proof-of-closure switch for remote verification. Certified to SIL 3 and compliant with ASME Section VIII and API 6D, the 377 ensures reliable performance in oil and gas, chemical, and power generation environments, minimizing risks and enhancing operational safety.
| Parameter | Specification |
|---|---|
| Body Size | NPS 1/4 to 1 (DN 8 to 25) |
| End Connections | NPT, ANSI Class 600 RF flanged, socket weld |
| Maximum Pressure | 6000 psig (414 barg) |
| Set Pressure Range | 15 to 5000 psig (1 to 345 barg) |
| Temperature Range | -54°C to +107°C (-65°F to +225°F) |
| Body Materials | Aluminum (377H), Stainless Steel (377S) |
| Proof-of-Closure Switch | Single-pole, double-throw (SPDT), 2A at 24 VDC |
| Certifications | SIL 3 (IEC 61508), ASME Section VIII, API 6D, ATEX, IECEx |
| Enclosure Rating | NEMA 4X, IP66 |
| Weight | 1.4 kg (3 lbs) approximate |
The Fisher 377 Pressure Sensing Trip Valve is ideal for safety-critical pressure protection:
It senses pressure and trips to shut off flow when the set point is exceeded, protecting systems from overpressure.
Yes, it is certified for ATEX, IECEx, and other standards for explosive environments.
It provides remote verification of valve position, confirming closure without manual inspection.
Aluminum (377H) for general use and stainless steel (377S) for corrosive environments.
Yes, it is field-adjustable from 15 to 5000 psig for precise application needs.
For more information about the Fisher 377 Pressure Sensing Trip Valve, pricing, or to request a demo, contact our team:
