Through-Conduit Gate Valve -- API 6D WCB
Technical Datasheet -- Expanding Gate Valves for Oil & Gas Pipeline Service
Document No.SV-DATA-TCGV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Through-conduit expanding gate valves for oil & gas pipeline isolation service. Full-bore design with parallel expanding gate and segment provides mechanical sealing against both seats, independent of line pressure. API 6D compliant with double block and bleed capability. Metal-to-metal Stellite seats are inherently fire-safe. In-line seat replacement capability.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Through-Conduit Gate Valves |
| Category | Gate Valves |
| Size Range | 2" to 48" (DN50 to DN1200) |
| Pressure Class | Class 150 / Class 300 / Class 600 / Class 900 per ASME B16.5 |
| End Connections | RF / RTJ flanged per ASME B16.5 or butt-weld per ASME B16.25 |
| Body Material | ASTM A216 WCB / ASTM A217 WC6 (high temp) / ASTM A351 CF8M (SS316) |
| Gate / Segment | ASTM A216 WCB with ENP or SS316 with Stellite overlay |
| Seat Material | SS316 with Stellite 6 overlay -- metal-to-metal seal (fire-safe by design) |
| Stem Material | ASTM A276 410 / SS316 with anti-blowout design |
| Bore | Full bore (FB) equal to pipe ID per API 6D -- minimal pressure drop |
| Operation | Handwheel (up to 12 inch) / Bevel gear (14 inch and above) / Actuator |
| Leakage Class | API 598 / EN 12266-1 -- zero visible leakage for metal-to-metal seat after expanding gate actuation |
| DBB Feature | Double block and bleed -- expanding gate provides independent upstream and downstream seat isolation |
| Temperature Range | -29 deg C to +425 deg C (WCB body) -- up to +540 deg C (WC6 body) |
Materials of Construction
| Component | Material |
|---|
| Carbon Steel | ASTM A216 WCB, A105 (standard industrial) |
| Alloy Steel | ASTM A217 WC6, WC9 (high temperature > 425 deg C) |
| Stainless Steel | ASTM A351 CF8M (SS316) -- corrosive service |
| Seat Overlay | Stellite 6 on SS316 seat for erosion and galling resistance |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | API 6D Pipeline Valves, API 598, ASME B16.34 |
Notes
- Bore type (full bore FB) and pressure class must be specified by the purchaser.
- For sour gas service (H2S > 50 ppm), material upgrade to NACE MR0175 compliant materials is required.
- For cryogenic service (below -29 deg C), extended bonnet and low-temperature materials (ASTM A352 LCC) are required.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
