Swing Check Valve -- API 594 WCB
Technical Datasheet -- Hinged Disc Check Valves for Horizontal Pipeline Service
Document No.SV-DATA-SCV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Swing-type flanged check valves for horizontal pipeline service. Hinged disc swings open with forward flow and closes by gravity when flow reverses. API 594 / BS 1868 / ASME B16.34 compliant. Bolted bonnet with renewable Stellite seat ring. Low pressure drop when fully open.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Swing Check Valves |
| Category | Check Valves |
| Size Range | 2" to 48" (DN50 to DN1200) |
| Pressure Class | Class 150 / Class 300 / Class 600 / Class 900 per ASME B16.5 |
| End Connections | RF / RTJ flanged per ASME B16.5 or butt-weld per ASME B16.25 |
| Body Material | ASTM A216 WCB / ASTM A217 WC6 (high temp) / ASTM A351 CF8M (SS316) |
| Disc Material | ASTM A216 WCB with Stellite 6 overlay / SS316 disc with Stellite overlay |
| Hinge Pin | SS410 / SS316 with Stellite bushing -- corrosion and wear resistant |
| Seat Material | Integral WCB + Stellite 6 overlay or renewable SS316 + Stellite seat ring |
| Bonnet Type | Bolted bonnet with spiral wound SS316/graphite gasket |
| Face-to-Face | API 594 long pattern or ASME B16.10 |
| Orientation | Horizontal installation only (disc must swing freely with gravity) |
| Leakage Class | API 598 / EN 12266-1 -- metal seated standard leakage acceptable |
| Temperature Range | -29 deg C to +425 deg C (WCB) -- up to +540 deg C (WC6) |
Materials of Construction
| Component | Material |
|---|
| Carbon Steel | ASTM A216 WCB, A105 (standard industrial) |
| Alloy Steel | ASTM A217 WC6, WC9 (high temperature) |
| Stainless Steel | ASTM A351 CF8M (SS316) -- corrosive service |
| Seat Overlay | Stellite 6 on WCB/WC6/SS316 seat for erosion and wear resistance |
| Hinge Bushing | Stellite or bronze bushing on hinge pin for long wear life |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | API 594 Check Valves, BS 1868, ASME B16.34 |
Notes
- Swing check valves must be installed in horizontal pipelines only, with hinge pin at the top and flow direction matching the body arrow.
- For vertical pipeline installations, piston check valve or dual-plate check valve is recommended instead.
- For high-temperature steam service (> 425 deg C), material upgrade to WC6 or WC9 is required.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
