Pilot Operated Pressure Relief Valve (POPRV)
Advanced overpressure relief solution designed to API 526 and ASME Section VIII. By utilizing system pressure to hold the main valve piston closed, it allows operating pressures up to 98% of set pressure without seat leakage, unaffected by variable backpressure in flare collector mains.
Design Criteria & Manufacturing Specifications
Manufactured strictly to API 526 and ASME Section VIII Div 1 with 100% factory set pressure testing, field test verification ports, and full EN 10204 3.1 material traceability.
| Engineering Parameter | Applicable Codes, Standards & Design Criteria |
|---|---|
| Design & Sizing Standard | API 526, API 520 Part I & II, ASME Section VIII Div 1, ISO 4126-4 |
| Orifice Designation Range | API 526 Standard Orifices D through T (Custom Engineered up to W Orifice) |
| Flange Connection Standards | ASME B16.5 Class 150 to Class 2500 RF / RTJ |
| Operating Ratio Capability | Continuous tight shutoff up to 98% of set pressure with zero simmering or chatter |
| Backpressure Handling | Unbalanced or variable backpressure up to 70% of set pressure without relieving derating |
| Body & Bonnet Metallurgy | ASTM A216 WCB / ASTM A350 LF2 (Low-Temp) / ASTM A351 CF8M / Duplex 2205 |
| Pilot Control System | Non-Flowing Snap-Action & Modulating Types with Dual Coalescing Filter |
| Testing & Inspection | API 527 Bubble-Tight Seat Integrity, API 598 Shell Hydrostatic, Field Test Connection Verification |
Pilot-Operated Safety Valve Standard & Engineered Models
Browse TSV's complete portfolio of modulating, snap-action, and non-flowing pilot operated pressure relief valves engineered for natural gas transport pipelines, offshore separator skids, and refinery hydrocarbon manifolds.
Modulating Pilot-Operated High-Pressure Safety Relief Valve
Main valve opens proportionally to the overpressure magnitude rather than full pop, eliminating product loss and pressure surges in long gas trunklines.
Snap-Action Gas Pipeline Pilot Safety Relief Valve with Remote Blowdown
Rapid zero-delay pop action with optional remote pneumatic blowdown port for automated emergency blowdown and plant ESD system integration.
Non-Flowing Dual-Outlet High-Capacity Pilot Safety Valve for Sour Gas
Non-flowing pilot valve loop isolates internal control passages from aggressive sour gas media, preventing clogging, hydrate freezing, and polymer buildup.
Pilot-Operated Relief Dynamic Sensing & Sealing Mechanics
Unlike conventional spring-loaded valves where seating force decreases as pressure nears set point, POPRVs utilize upstream system pressure to drive piston seating force higher until exact set pressure pop.
Pressure-Actuated Seating Load
Inlet pressure routed to the main valve dome exerts downward piston force larger than inlet nozzle thrust, ensuring zero bubble leakage even at 98% of operating set pressure.
Total Variable Backpressure Immunity
Backpressure in common relief headers acts equally on balanced piston surfaces or exhausts via pilot sensing loops, eliminating set point shifting up to 70% backpressure.
In-Situ Field Test Port Verification
Integrated test ports enable plant maintenance technicians to verify exact pilot set pressure using external test pressure without taking the main valve offline or breaking line flanges.
Explore All 4 Safety & Relief Valve Sub-Categories
1:1 aligned with TSV factory catalog. Navigate to spring full-lift steam safety, modulating pilot-operated, parallelled back-flow, or thermal relief valves.
Spring Safety Valve
ASME I & VIII full-lift enclosed spring safety valve with blowdown control rings for boilers and vessels.
ASME I & VIII Full Lift View Details →Pilot-Operated Safety Valve
Modulating and snap-action pilot valves operating bubble-tight up to 98% of set pressure on gas pipelines.
Current Series View Page Top ↑Parallelled Safety Valve
Specialized parallel dual-chamber safety back-flow valve for liquid discharge, LPG pump bypass, and vessel return.
AHN42F Parallel Back-Flow View Details →Thermal Relief Valve
Compact high-pressure thermal expansion relief valves protecting piping, heat exchangers, and liquid lines.
API 526 / ASME VIII View Details →Configure & Request a Quote for Pilot-Operated Safety Valves
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