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Integral Check Valve and Modulating Bypass for Pump Protection
This datasheet covers automatic recirculation valves that combine a main line check valve with an integral modulating bypass to protect centrifugal pumps from low-flow damage in boiler feed and process applications.
| Parameter | Specification |
|---|---|
| Valve Size Range | DN50 to DN300 (2" to 12") main; DN25 to DN100 bypass |
| Pressure Rating | PN40 / Class 300 / Class 600 / Class 900 |
| Body Material | WCB, WC6, WC9, CF8M (SS316) |
| Trim Material | SS316 + Stellite 6, 13Cr hard-faced |
| Bypass Control | Modulating multi-stage disc or piston with characterised opening |
| Minimum Flow Setting | Factory-set per pump curve; field adjustable ± 10% |
| Temperature Range | -29°C to +593°C (WC9) |
| End Connections | Flanged ASME B16.5, butt weld |
| Leakage Class | ANSI/FCI 70-2 Class IV (main), Class II (bypass) |
| Features | Integral check + bypass, no external power, self-acting |
| Component | Material |
|---|---|
| Body | WCB or WC6 / WC9 cast steel, one-piece body with integral bypass chamber |
| Main Disc | SS316 with Stellite 6 overlay, spring-assisted for rapid closing |
| Bypass Trim | SS316 multi-stage piston or disc with characterised flow slots |
| Seat | Integral SS316 with Stellite 6; replaceable seat ring for high-differential service |
| Spring | Inconel X-750 for high-temperature creep resistance |
| Packing | Graphite braided rings with anti-extrusion end rings |
| Gaskets | Spiral-wound SS316 + graphite for body/cover joint |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / IEC 60534-4 |
| Certification | CE, PED, ISO 9001, IBR |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / API 6D / IEC 60534 |
The Automatic Recirculation Valve -- Pump Minimum Flow 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.