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Technical Datasheet -- PORV for Gas Pipeline Overpressure Protection
Pilot-operated relief valves (PORV) for natural gas pipeline overpressure protection. Spring-loaded main valve with external pilot control provides precise pressure sensing, fast response, and bubble-tight shutoff. Compliant with API 526 (flanged steel pressure relief valves) and API 527 (seat tightness).
| Parameter | Specification |
|---|---|
| Product Type | Pilot-Operated Relief Valve (PORV) |
| Category | Safety & Relief Valves |
| Size Range | 2" (DN50) -- other sizes on request |
| Pressure Class | Class 150 RF per ASME B16.5 |
| End Connections | Raised Face (RF) Flanged per ASME B16.5 |
| Flow Rating | Up to 1 MMSCFD (customisable per orifice size) |
| Body Material | ASTM A216 WCB Carbon Steel Casting |
| Trim Material | SS316 Stainless Steel |
| Seat Material | PTFE / SS316 Soft Seat -- bubble-tight shutoff |
| Pilot Material | SS316 Stainless Steel |
| Spring Material | Alloy Steel / Chrome-Silicon (set to purchaser specification) |
| Seat Leakage | Class VI (bubble-tight) per API 527 / ANSI/FCI 70-2 |
| Set Pressure | Factory-set and sealed per purchaser specification (typical 10--50 barg for gas distribution) |
| Blowdown | Adjustable per API 526 -- typically 4% to 7% of set pressure |
| Overpressure | 10% maximum accumulation per API 526 |
| Component | Material |
|---|---|
| Carbon Steel | ASTM A216 WCB, A105, A350 LF2 |
| Stainless Steel | SS304, SS316, SS316L, SS321 |
| Alloy Steel | ASTM A217 WC6, WC9, C5, C12 |
| Spring Steel | Chrome-Silicon, Inconel X-750 (high temperature) |
| Test | Requirement |
|---|---|
| Testing | Hydrostatic shell test 1.5 x design pressure per API 598 / EN 12266-1; Seat leakage test 1.1 x design pressure -- zero visible leakage; Set pressure verification -- each valve individually tested and certified |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports, set pressure verification certificate |
| Standard | Description |
|---|---|
| Design Standard | API 526 Flanged Steel Pressure Relief Valves, API 527 Seat Tightness |
| Service Standard | ASME B31.8 Gas Transmission and Distribution Piping Systems |
The Pilot-Operated Relief Valve -- API 526/527 Natural Gas Service is designed, manufactured, and tested in accordance with applicable API / ASME / BS / ISO international standards. Compliance documentation and Material Test Certificates (EN 10204 3.1) are provided with every order.
Standard construction is carbon steel, stainless steel (CF8 / CF8M), and special alloy grades. Alternative and upgraded grades -- Duplex, Super Duplex, Inconel, Monel, Hastelloy, and NACE MR0175 trims for sour service -- are available on request.
It is offered in a range of sizes as per the technical specification with standard ANSI / ASME pressure classes (PN ratings on request). End connections include flanged (RF / RTJ), butt-weld, socket-weld, and screwed ends as per specification.
Yes. Supreme Valves India is an established exporter of industrial valves to Saudi Arabia (KSA), the UAE, Qatar, Kuwait, Oman, Bahrain, and across the Gulf. We provide sea-worthy export packing, EN 10204 3.1 / 3.2 certification, certificate of origin, and support for SABER / SASO conformity on KSA shipments.
Every valve undergoes hydrostatic shell and seat testing per API 598 / ISO 5208. Documentation includes EN 10204 3.1 MTC (3.2 on request), NDT reports, and fire-safe (API 607) or NACE MR0175 certification where applicable. Third-party inspection by TÜV, SGS, Bureau Veritas, or Lloyd's Register can be arranged.
Order quantities are flexible -- from single units for stocked items to bulk volumes for project requirements. Lead time depends on size, material, and quantity; please contact our team with your specification for a firm delivery schedule and quotation.