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Technical Datasheet -- Corrosion-Resistant Non-Return Valve for Chemical Service
Dual-plate wafer check valves in Alloy 20 (UNS N08020) for highly corrosive chemical processing applications. The spring-assisted dual-plate design provides rapid non-slam closure, protecting downstream equipment from backflow and water hammer. Compact wafer face-to-face dimension per API 594 minimises weight and installation space.
| Parameter | Specification |
|---|---|
| Product Type | Dual-Plate Wafer Check Valve |
| Category | Non-Return Valves |
| Size Range | 2" to 24" (DN50 to DN600) -- other sizes on request |
| Pressure Class | Class 150 per ASME B16.5 |
| End Connections | Wafer type -- fits between ASME B16.5 Class 150 flanges |
| Body Material | Alloy 20 (UNS N08020) ASTM A351 CN7M |
| Disc Material | Alloy 20 (UNS N08020) with SS316 spring |
| Seat Material | Alloy 20 integral seat with SS316 spring-assisted closure |
| Spring Material | SS316 Stainless Steel (Inconel X-750 for high temperature) |
| Hinge / Pin | SS316 or Alloy 20 |
| Face-to-Face | API 594 short pattern (compact wafer design) |
| Leakage Class | API 598 / EN 12266-1 -- metal seat standard leakage |
| Temperature Range | -29 deg C to +260 deg C (SS316 spring) -- up to +425 deg C with Inconel spring |
| Non-Slam Feature | Spring-assisted dual-plate closure minimises water hammer and reverse-flow damage |
| Component | Material |
|---|---|
| Alloy 20 | UNS N08020, ASTM A351 CN7M -- excellent resistance to sulphuric acid |
| Stainless Steel | SS316 springs, pins, and hinge components |
| Inconel | X-750 springs for high-temperature service |
| Test | Requirement |
|---|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598; Seat leakage test per API 598 / EN 12266-1; Functional test -- spring response, plate swing, non-slam closure |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates (with PMI), hydrostatic and seat test reports |
| Standard | Description |
|---|---|
| Design Standard | API 594 Dual-Plate Check Valves, ASME B16.10 face-to-face |
The Dual-Plate Wafer Check Valve -- Alloy 20 Class 150 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.