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Technical Datasheet -- Over-Pressure and Under-Pressure Safety Shut-Off Device
Slam-shut valves (SSV) are emergency safety shut-off devices for natural gas distribution and transmission pipelines. They automatically close the gas flow upon detection of over-pressure or under-pressure conditions, protecting downstream equipment and personnel. The self-contained mechanical trip mechanism requires no external power, instrument air, or control system.
| Parameter | Specification |
|---|---|
| Product Type | Slam-Shut Valve (SSV) -- Emergency Safety Shut-Off |
| Category | Gas Safety Valves |
| Size Range | 4" to 6" (DN100 to DN150) -- other sizes on request |
| Pressure Class | Class 150 RF / Class 300 RF / Class 600 RF per ASME B16.5 |
| End Connections | Raised Face (RF) Flanged per ASME B16.5 -- RTJ available on request for Class 600 |
| Flow Rating | 5 / 25 / 40 MMSCFD (size and pressure class dependent) |
| Body Material | ASTM A216 WCB (Class 150/300) -- ASTM A217 WC6 (Class 600 high temp) |
| Trim Material | SS316 Stainless Steel |
| Seat Material | PTFE / SS316 Soft Seat -- bubble-tight shutoff |
| Trip Mechanism | SS316 / Alloy Steel mechanical trip, self-contained, no external power |
| Trip Function | Over-pressure trip + Under-pressure trip (settings factory-set per purchaser spec) |
| Reset | Manual lever / handwheel after trip event |
| Response Time | < 1 second for full closure from trip signal |
| Component | Material |
|---|---|
| Carbon Steel | ASTM A216 WCB, A105 |
| Alloy Steel | ASTM A217 WC6, WC9 (high pressure / high temp) |
| Stainless Steel | SS304, SS316, SS316L trim |
| Seat | PTFE / RPTFE / SS316 soft seat with metal backup |
| Test | Requirement |
|---|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test 1.1 x WP -- zero visible leakage; Functional test -- full stroke, trip test, reset test; Set pressure verification -- each valve individually tested and certified |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, functional test reports, set pressure verification certificates |
| Standard | Description |
|---|---|
| Design Standard | ISO 23555 Safety Shut-Off Devices for Gas Burners and Gas Appliances |
| Service Standard | ASME B31.8 Gas Transmission and Distribution Piping Systems |
The Slam-Shut Valve (SSV) -- Natural Gas Emergency Safety Shut-Off 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.
The standard and optional materials of construction - body, bonnet, wedge/disc, stem, gland and handwheel - are listed in the Materials of Construction table on this datasheet. Special-alloy and upgraded trims 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). Refer to the End Connection row in the Technical Specifications table on this datasheet for the exact ends offered for this valve.
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.