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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 |