Wafer Swing Check Valve -- Compact SS316 API 594
Technical Datasheet -- Compact Wafer Swing Check Valves for Space-Restricted Installations
Document No.SV-DATA-WSCV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Compact wafer swing check valves for horizontal pipeline service. Hinged disc swings open with low pressure drop and closes by gravity on flow reversal. Fits between existing flanges with short face-to-face dimension -- 60--70% shorter than flanged swing check valves. Full-bore or standard-bore options. Bolted cover with renewable Stellite seat ring. API 594 / BS 1868 / ASME B16.34 compliant. SS316, WCB, WC6, or NAB body.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Wafer Swing Check Valves |
| Category | Check Valves |
| Size Range | 2" to 24" (DN50 to DN600) |
| Pressure Class | Class 150 / Class 300 / Class 600 / PN10 / PN16 / PN25 per ASME B16.5 / EN 1092-1 |
| End Connections | Wafer type (fits between flanges) or Lug type (through-bolted) per API 594 / ASME B16.5 / EN 1092-1 |
| Body Material | ASTM A351 CF8M (SS316) / ASTM A216 WCB / ASTM A217 WC6 (high temp) / ASTM B148 C95800 (NAB, marine) |
| Disc Material | SS316 with Stellite 6 overlay / SS316 with ENP or chrome plating / NAB (marine) |
| Hinge Pin | SS410 / SS316 with Stellite bushing -- corrosion and wear resistant |
| Seat Material | SS316 with Stellite 6 overlay / renewable SS316 + Stellite seat ring |
| Bonnet Type | Bolted cover with spiral wound SS316/graphite gasket -- removable for disc and seat access |
| Face-to-Face | API 594 wafer short pattern or manufacturer's standard (compact for space-restricted installations) |
| Orientation | Horizontal installation only (disc must swing freely with gravity) |
| Bore | Full bore (FB) or standard bore (SB) per API 594 |
| Leakage Class | API 598 / EN 12266-1 -- metal seated standard leakage acceptable |
| Temperature Range | -29 deg C to +425 deg C (WCB/SS316) -- up to +540 deg C (WC6) |
Materials of Construction
| Component | Material |
|---|
| Stainless Steel | ASTM A351 CF8M (SS316) body, disc, hinge, and seat (corrosive / standard service) |
| Carbon Steel | ASTM A216 WCB body and disc (standard industrial) |
| Alloy Steel | ASTM A217 WC6, WC9 body and disc (high temperature > 425 deg C) |
| Nickel-Aluminium-Bronze | ASTM B148 C95800 (NAB) body and disc (marine / seawater) |
| Seat Overlay | Stellite 6 on 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
- Install in horizontal pipelines only, with hinge pin at the top and flow direction matching the body arrow.
- For vertical pipeline installations, use piston check valve or dual-plate check valve instead.
- For high-temperature steam service (> 425 deg C), material upgrade to WC6 or WC9 body with Stellite seat overlay is required.
- Confirm mating flange standard and drilling pattern for wafer or lug body compatibility.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
