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Pilot-Operated Self-Acting Pressure Reducing Valve for Steam and Hot Water
This datasheet covers self-acting pilot-operated pressure reducing valves in WCB for steam pressure reduction, process steam distribution, heater supply, and hot water system pressure control.
| Parameter | Specification |
|---|---|
| Valve Size Range | DN15 to DN200 (1/2" to 8") |
| Pressure Rating | PN40 / Class 300 |
| Body Material | WCB carbon steel, normalised and tempered |
| Main Valve Seat | SS316 + Stellite 6 hard facing, integral or replaceable |
| Piston / Disc | SS316 multi-stage piston/disc with characterised flow slots |
| Pilot Diaphragm | SS316 diaphragm with fabric reinforcement for steam compatibility |
| Control Spring | Alloy steel control spring, factory-set per pressure range |
| Strainer | SS304 inline strainer with 0.8 mm perforation, cleanable |
| 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 with graphite packing) |
| End Connections | Flanged ASME B16.5 / BS EN 1092-1, threaded NPT, socket weld |
| Accuracy | ± 5% of set point under rated flow variation |
| Turndown Ratio | Up to 20:1 depending on size and trim characteristic |
| Features | Self-acting no power, pilot-operated high accuracy, high turndown, stable control, external sensing, easy adjustment |
| Component | Material |
|---|---|
| Body | WCB carbon steel, sand cast, normalised and tempered, machined seat bore and flange faces |
| Bonnet | WCB carbon steel, bolted bonnet with spiral-wound gasket groove and pilot connection boss |
| Main Valve Seat | SS316 with Stellite 6 cobalt alloy hard facing for steam cutting and erosion resistance |
| Piston / Disc | SS316 multi-stage piston or disc with characterised flow slots for stable pressure reduction |
| Pilot Diaphragm | SS316 with woven fabric reinforcement, compatible with saturated and superheated steam |
| Control Spring | Alloy steel helical spring, shot-peened and preset, selected per inlet and outlet pressure range |
| Strainer | SS304 inline Y-strainer with 0.8 mm perforation, cleanable without removing valve from line |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / IEC 60534-4 / ANSI/FCI 70-2 |
| Certification | CE, PED, ISO 9001, IBR on request |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / IEC 60534 / ISA S75.08 |
The Self-Acting Pressure Reducing Valve -- Pilot Steam 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.