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Spring-Loaded Parallel Disc Isolation Valve for Steam and Thermal Cycling Service
This datasheet covers parallel slide gate valves in WCB with spring-loaded parallel discs for steam main isolation, turbine bypass, and process heater steam service where thermal cycling resistance is critical.
| Parameter | Specification |
|---|---|
| Valve Size Range | DN50 to DN600 (2" to 24") |
| Pressure Rating | Class 150 / Class 300 / Class 600 |
| Body Material | WCB carbon steel, normalised and tempered |
| Disc Material | SS316 + Stellite 6 hard facing, parallel spring-loaded discs |
| Spreader Spring | Inconel X-750 disc spreader spring for thermal cycling resistance |
| Seat Material | Integral Stellite 6 overlay, lapped to disc surfaces |
| Stem Material | SS316 rising stem with ACME threads and thrust bearing |
| Packing | Graphite braided rings with anti-extrusion end rings |
| Gaskets | Spiral-wound SS316 + graphite for body/bonnet and flange joints |
| Temperature Range | -29°C to +425°C (WCB standard) |
| End Connections | Flanged ASME B16.5, butt weld ASME B16.25 |
| Operation | Handwheel, bevel gear, motorised or pneumatic actuator |
| Features | Parallel slide, spring-loaded discs, full port, position indicator |
| Component | Material |
|---|---|
| Body | WCB carbon steel, sand cast, normalised and tempered, machined flange faces |
| Bonnet | WCB carbon steel, bolted bonnet with spiral-wound gasket groove |
| Discs | SS316 parallel discs with Stellite 6 cobalt alloy hard facing on seating surfaces |
| Spreader Spring | Inconel X-750 precipitation-hardened nickel alloy spring for high-temperature creep resistance |
| Seat | Integral WCB with Stellite 6 overlay; renewable seat ring optional for severe service |
| Stem | SS316 rising stem with precision ACME threads and handwheel nut thrust bearing |
| Gaskets | Spiral-wound SS316 + graphite for body/bonnet joint; same for flange gaskets |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / ISO 5208 |
| Certification | CE, PED, ISO 9001, IBR on request |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / API 600 / BS 1414 |
The Parallel Slide Gate Valve -- Steam Service 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.