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Technical Datasheet -- Silent Non-Slam Spring-Assisted Check Valves for Pump Discharge
Silent (non-slam, spring-assisted) check valves for pump discharge, compressor, and water hammer-sensitive systems. Centrally-guided disc with calibrated spring return provides rapid, controlled closure before flow reversal, eliminating water hammer and pipeline vibration. Wafer, lug, or flanged design. Horizontal, vertical, or inclined installation. Low cracking pressure (0.02--0.05 bar). SS316, WCB, or ductile iron body with Stellite seat overlay. API 594 / ASME B16.34 / AWWA C508 compliant.
| Parameter | Specification |
|---|---|
| Product Type | Silent Check Valves |
| Category | Check Valves |
| Size Range | 2" to 48" (DN50 to DN1200) |
| Pressure Class | Class 150 / Class 300 / Class 600 / 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 A216 WCB / ASTM A351 CF8M (SS316) / ASTM A217 WC6 (high temp) / Ductile Iron EN-GJS-500-7 (GGG50, water service) |
| Disc Material | SS316 with Stellite 6 overlay / SS316 with ENP or chrome plating / Ductile iron with EPDM/NBR coating (water service) |
| Guide / Bushing Material | SS316 with bronze or PTFE-lined bushing / SS410 with Stellite bushing |
| Spring Material | SS316 (standard) / Inconel X-750 (high temp) / Elgiloy (corrosion resistant, seawater) |
| 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 / manufacturer's standard for silent check design |
| Orientation | Horizontal or vertical (spring-assisted closure works in all orientations) |
| Cracking Pressure | 0.02 to 0.05 bar (spring pre-load) -- dependent on spring rate 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 (WCB/SS316) -- up to +540 deg C (WC6/Inconel spring) |
| Component | Material |
|---|---|
| Carbon Steel | ASTM A216 WCB body and disc (standard industrial) |
| Stainless Steel | ASTM A351 CF8M (SS316) body, disc, guide, and seat (corrosive / standard service) |
| Alloy Steel | ASTM A217 WC6 body and disc (high temperature > 425 deg C) |
| Ductile Iron | EN-GJS-500-7 (GGG50) epoxy-coated body and disc with EPDM/NBR coating (economical water / HVAC) |
| Seat Overlay | Stellite 6 on SS316 seat for erosion and wear resistance |
| Spring | SS316 (standard), Inconel X-750 (high temp > 400 deg C), Elgiloy (seawater / corrosion resistant) |
| 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 |
| Standard | Description |
|---|---|
| Design Standard | API 594 Check Valves, ASME B16.34, AWWA C508 (resilient-seated check valves, reference), EN 12334 |
The Silent Check Valve -- Spring-Assisted Pump Discharge 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.