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High-Pressure High-Temperature On/Off Valve for Thermal Power Plants
This datasheet covers pressure seal globe valves in WC9 Cr-Mo steel for main steam isolation, turbine bypass, and boiler outlet stop service in thermal and combined-cycle power plants.
| 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 steel, normalised and tempered |
| Plug / Seat Material | WC9 + Stellite 6 overlay, 13Cr hard-faced seat |
| Bonnet Seal | Pressure seal graphite ring + segmented thrust ring (no bolting) |
| Temperature Range | -29°C to +593°C (WC9 limit) |
| End Connections | Butt weld ASME B16.25, flanged ASME B16.5 (Class 1500/2500) |
| Operation | Gear operator, motorised actuator, or hydraulic actuator |
| Leakage Class | ANSI/FCI 70-2 Class V (metal seat) |
| Flow Characteristic | Quick-opening plug for on/off; modified equal-percentage for control |
| 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 |
| Plug | WC9 with full Stellite 6 overlay on seat contact surface for erosion and galling resistance |
| Seat | Integral WC9 with Stellite 6 hard facing; replaceable seat ring on request |
| Stem | 17-4PH precipitation-hardened stainless steel for high-temperature strength and galling resistance |
| Packing | Pure graphite braided rings with Inconel wire reinforcement for 593°C service |
| Gaskets | Pure graphite pressure seal ring with anti-extrusion lip; no spiral winding required |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / ASME B16.34 pressure test |
| Certification | CE, PED, ISO 9001, IBR (Indian Boiler Regulations) |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / API 623 / IEC 60534 |
The Power Plant Steam Stop Valve -- Pressure Seal WC9 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.