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High-Pressure High-Temperature Isolation Valve for Main Steam and Reheat Service
This datasheet covers high-pressure pressure seal gate valves in WC9 Cr-Mo steel with flexible wedge for main steam, hot reheat, and supercritical process isolation. Units are factory-tested and IBR-certified before dispatch.
| Parameter | Specification |
|---|---|
| Valve Size Range | DN50 to DN400 (2" to 16") |
| Pressure Rating | Class 900 / Class 1500 / Class 2500 |
| Body Material | WC9 (2.25Cr-1Mo) cast Cr-Mo steel, normalised and tempered |
| Wedge Material | SS316 + Stellite 6 hard facing, flexible wedge with centre hub |
| Seat Material | Integral SS316 + Stellite 6 overlay, lapped to wedge |
| Stem Material | 17-4PH precipitation-hardened stainless steel, anti-galling |
| Bonnet Seal | Graphite pressure seal ring with segmented thrust ring |
| Packing | Pure graphite braided rings with Inconel wire reinforcement |
| Gaskets | Spiral-wound SS316 + graphite for body/bonnet and flange joints |
| Temperature Range | -29°C to +593°C (WC9 limit) |
| End Connections | Butt weld ASME B16.25, flanged ASME B16.5 |
| Operation | Handwheel, bevel gear, motorised or hydraulic actuator |
| Features | Pressure seal bonnet, flexible wedge, full port, position indicator |
| Component | Material |
|---|---|
| Body | WC9 (2.25Cr-1Mo) cast steel, normalised 920°C, tempered 720°C, hardness 180-220 BHN |
| Bonnet | WC9 pressure seal type with graphite seal ring and segmented thrust ring assembly |
| Wedge | SS316 flexible wedge with Stellite 6 cobalt alloy overlay on seating surfaces |
| Seat | Integral SS316 with full Stellite 6 hard facing; renewable seat ring optional |
| Stem | 17-4PH precipitation-hardened stainless steel for high-temperature strength and galling resistance |
| Packing | Graphite braided rings with Inconel wire reinforcement for 593°C superheated steam service |
| Gaskets | Spiral-wound SS316 + graphite for flanged joints; pure graphite pressure seal ring for bonnet |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / ASME B16.34 |
| Certification | CE, PED, ISO 9001, IBR |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / API 600 / API 602 |
The Pressure Seal Gate Valve -- Flexible Wedge WC9 High Pressure 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.