Nozzle Check Valve -- SS316 Axial Flow
Technical Datasheet -- Spring-Assisted Axial Flow Check Valves for Low Pressure Drop
Document No.SV-DATA-NCV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Axial-flow nozzle check valves for low pressure drop and non-slam closure. Spring-assisted disc moves axially along the flow centreline, eliminating the water hammer common in swing check valves. Compact wafer or flanged design suitable for any orientation. API 594 / ASME B16.34 compliant. SS316 or WCB body with Stellite seat overlay.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Nozzle Check Valves |
| Category | Check Valves |
| Size Range | 2" to 48" (DN50 to DN1200) |
| Pressure Class | Class 150 / Class 300 / Class 600 / PN16 / PN25 / PN40 |
| End Connections | Wafer type (fits between flanges) or RF flanged per ASME B16.5 / EN 1092-1 |
| Body Material | ASTM A351 CF8M (SS316) / ASTM A216 WCB / ASTM B148 C95800 (NAB) |
| Disc Material | SS316 with Stellite 6 overlay or solid SS316 |
| Seat Material | SS316 with Stellite 6 overlay -- metal-to-metal seal |
| Spring Material | SS316 (standard) / Inconel X-750 (high temp) / Elgiloy (corrosion resistant) |
| Guide Material | SS316 guide bushing with PTFE or bronze liner |
| Face-to-Face | API 594 wafer pattern or ASME B16.10 short pattern |
| Orientation | Any orientation (horizontal, vertical, inclined) |
| Cracking Pressure | 0.03 to 0.1 bar (dependent on spring selection and disc weight) |
| 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) -- up to +540 deg C (Inconel spring) |
Materials of Construction
| Component | Material |
|---|
| Stainless Steel | ASTM A351 CF8M (SS316), CF3M (SS316L) |
| Carbon Steel | ASTM A216 WCB (standard industrial) |
| Nickel-Aluminium-Bronze | ASTM B148 C95800 (NAB) -- marine / seawater |
| Seat Overlay | Stellite 6 on SS316 seat for erosion resistance |
| Spring | SS316, Inconel X-750, or Elgiloy depending on temperature and corrosion requirements |
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, ASME B16.34, EN 12334 |
Notes
- Spring rate and cracking pressure must be specified by the purchaser based on system flow characteristics.
- For high-temperature service (> 425 deg C), Inconel X-750 spring and WC6/WC9 body material are required.
- For marine / seawater service, Nickel-Aluminium-Bronze (NAB / C95800) body and trim with Elgiloy spring is recommended.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
