Tilting Disc Check Valve -- API 594 SS316
Technical Datasheet -- Tilting Disc Check Valves for Low Pressure Drop and Non-Slam Closure
Document No.SV-DATA-TDCV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Tilting disc (tilting wafer) check valves for horizontal and vertical pipeline service. Hinged disc tilts open with minimal obstruction at very low cracking pressure (0.02--0.05 bar), providing 30--50% lower pressure drop than equivalent swing check valves. Rapid non-slam closure on flow reversal prevents water hammer and pipeline vibration. Compact wafer or lug design. SS316, WCB, or NAB body. API 594 / BS 1868 / ASME B16.34 compliant. Optional spring-assisted closure for vertical installations.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Tilting Disc Check Valves |
| Category | Check Valves |
| Size Range | 2" to 60" (DN50 to DN1500) |
| Pressure Class | Class 150 / Class 300 / Class 600 / Class 900 / PN10 / PN16 / PN25 / PN40 per ASME B16.5 / EN 1092-1 |
| End Connections | Wafer type (fits between flanges) or Lug type (through-bolted) or RF flanged per 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 / Shaft Material | SS410 / SS316 with Stellite bushing -- corrosion and wear resistant |
| Seat Material | SS316 with Stellite 6 overlay / SS316 with ENP -- integral or renewable seat ring |
| Face-to-Face | API 594 wafer pattern or ASME B16.10 short pattern |
| Orientation | Horizontal or vertical (hinge pin at top for horizontal; shaft horizontal for vertical upward flow) |
| Cracking Pressure | 0.02 to 0.05 bar (dependent on disc weight and spring, if fitted) |
| Leakage Class | API 598 / EN 12266-1 -- metal seated standard leakage acceptable; soft seat option: Class A |
| Temperature Range | -29 deg C to +425 deg C (SS316/WCB) -- 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 |
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, EN 12334 |
Notes
- Installation orientation (horizontal, vertical upward flow, or vertical downward flow) must be specified by the purchaser for correct hinge/shaft and spring configuration.
- For vertical downward flow installations, spring-assisted closure is mandatory; gravity-only operation is not suitable.
- For high-temperature steam service (> 425 deg C), material upgrade to WC6 or WC9 body with Stellite seat overlay is required.
- For frequent flow reversal or pulsating flow (reciprocating pumps, compressors), spring-assisted closure is strongly recommended regardless of orientation.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
