Fisher 377 Pressure Sensing Trip Valve
Product Overview
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.
Key Features
- SIL 3 Capability: Certified for high safety integrity levels in critical applications.
- Proof-of-Closure Switch: Enables remote position verification without manual testing.
- Compact Inline Design: Reduces installation space and simplifies piping.
- Direct-Operated Mechanism: Responds quickly to pressure changes without external power.
- Adjustable Set Points: Field-adjustable for precise pressure thresholds.
- Robust Construction: Aluminum or stainless steel body for durability in harsh environments.
- Low Maintenance: Self-contained design minimizes servicing needs.
- Versatile Mounting: Supports horizontal or vertical installation.
Technical Specifications
| 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 |
Applications
The Fisher 377 Pressure Sensing Trip Valve is ideal for safety-critical pressure protection:
- Safety Instrumented Systems (SIS): Automatic shutdown in overpressure events.
- Oil and Gas: Protects pipelines, compressors, and storage vessels.
- Chemical Processing: Ensures safe operation in reactors and pressure vessels.
- Power Generation: Safeguards boiler and turbine systems.
- Pharmaceutical: Provides reliable pressure relief in cleanroom environments.
Frequently Asked Questions
What is the primary function of the Fisher 377?
It senses pressure and trips to shut off flow when the set point is exceeded, protecting systems from overpressure.
Is the 377 suitable for hazardous areas?
Yes, it is certified for ATEX, IECEx, and other standards for explosive environments.
How does the proof-of-closure switch work?
It provides remote verification of valve position, confirming closure without manual inspection.
What materials are available for the 377?
Aluminum (377H) for general use and stainless steel (377S) for corrosive environments.
Can the set pressure be adjusted?
Yes, it is field-adjustable from 15 to 5000 psig for precise application needs.
Contact Us
For more information about the Fisher 377 Pressure Sensing Trip Valve, pricing, or to request a demo, contact our team:
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