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Branch Office: Mehta House, Relief Road, Ahmedabad 380001
Tel: +91 97732 78770 | Email: info@supremevalves.in | www.supremevalves.in
Mechanically Expanding Parallel Disc Isolation Valve for True DBB Service
This datasheet covers expanding parallel gate valves with mechanically expanding discs for true double block and bleed isolation in refinery, LNG, tank farm, and process switching applications.
| Parameter | Specification |
|---|---|
| Valve Size Range | DN50 to DN600 (2" to 24") |
| Pressure Rating | Class 150 / Class 300 / Class 600 / Class 900 |
| Body Material | WCB carbon steel, LCB low-temp, or CF8M on request |
| Expanding Wedge | SS316 + Stellite 6 hard facing, mechanically expanding parallel discs |
| Seat Material | Integral SS316 + Stellite 6 overlay, lapped to disc surfaces |
| Stem Material | SS316 rising stem with ACME threads and thrust bearing |
| Cam Mechanism | Hardened alloy steel cam and followers for disc expansion/retraction |
| Packing | Graphite braided rings with anti-extrusion end rings |
| Gaskets | Spiral-wound SS316 + graphite or RTJ gaskets per pressure class |
| Temperature Range | -29°C to +425°C (WCB); -46°C with LCB |
| End Connections | Flanged ASME B16.5, butt weld ASME B16.25 |
| Operation | Handwheel, bevel gear, motorised, pneumatic or hydraulic actuator |
| Features | Mechanical seal, true DBB, gate retracts, low seat wear, position indicator |
| Component | Material |
|---|---|
| Body | WCB carbon steel, sand cast, normalised, machined flange faces and seat bores |
| Bonnet | WCB carbon steel, bolted bonnet with spiral-wound or RTJ gasket groove |
| Expanding Wedge | SS316 parallel discs with Stellite 6 hard facing, linked by cam-driven expansion mechanism |
| Seat | Integral WCB with Stellite 6 overlay; renewable seat ring available for severe service |
| Stem | SS316 rising stem with precision ACME threads, anti-blow-out collar, and handwheel thrust bearing |
| Cam Mechanism | Hardened alloy steel cam body and followers, lubricated for life with high-temperature MoS2 grease |
| Gaskets | Spiral-wound SS316 + graphite for standard service; octagonal RTJ rings for Class 600 and above |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / ISO 5208 / API 6D (on request) |
| Certification | CE, PED, ISO 9001, API 6D Compliant on request |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / API 600 / BS 1414 |
The Expanding Gate Valve -- Double Block Bleed WCB 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.