Non Return Valve

​1. Product Overview​

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Check valves (non-return valves) automatically prevent backflow in piping systems, ensuring ​​unidirectional flow control​​ without manual or powered actuation.

​​Key Advantages​​

✔ ​​Zero Backflow​​ – Prevents reverse flow and system damage

✔ ​​Low Pressure Drop​​ – Optimized designs minimize flow resistance

✔ ​​Maintenance-Free​​ – No external control required

✔ ​​Versatile​​ – Suitable for liquids, gases, and steam

​​2. Valve Types & Construction​​

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By Design Type​

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Body Materials​​

​Cast Iron​​ (EN-JL104) – General water services

Ductile Iron​​ (EN-JS1049) – Higher shock resistance

Stainless Steel​​ (CF8M/CF8) – Corrosive media

​Alloy 20​​ – Sulfuric acid services

Bronze​​ – Marine/offshore applications

​​3. Technical Specifications​

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​​4. Seal & Spring Options​

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​​Seat Materials​​

NBR​​ – Oil/fuel resistance

​EPDM​​ – Water/steam (<120°C)

PTFE​​ – Chemical resistance (+200°C)

​Metal-to-Metal​​ – High-temp (>400°C)

​Spring Types (for lift/dual plate valves)​​

316 Stainless Steel​​ – Standard corrosion resistance

Inconel 718​​ – Extreme temp/pressure

Hastelloy C276​​ – Acidic environments

​​5. Specialized Designs​

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✔ ​​Silent Check Valves​​ – Spring-assisted closure prevents water hammer

✔ ​​Non-Slam​​ – Controlled closing for high-pressure systems

✔ ​​Cryogenic​​ – Extended bonnet for LNG (-196°C)

✔ ​​Wafer/Lug Style​​ – Compact for space-constrained installations

​​6. Industry Applications​

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​​7. Standards Compliance​​

​​API 594​​ – Wafer/lug check valves

​​API 6D​​ – Pipeline check valves

​​ISO 5752​​ – Face-to-face dimensions

​​ASME B16.34​​ – Pressure testing

​​PED 2014/68/EU​​ – European pressure directive

​​8. Quality Assurance​

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100% Pressure Testing​​ – Shell test + seat leakage test per API 598

Material Certification​​ – EN 10204 3.1/3.2

NDT Inspection​​ – PT/MT for critical service valves

Functional Testing​​ – Flow loop verification for cracking pressure

​​9. Why Choose Our Check Valves?​

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✅ ​​Low Cracking Pressure​​ – As low as 0.05 bar for sensitive systems

✅ ​​Anti-Slam Design​​ – Dampers/springs prevent water hammer

✅ ​​Customization​​ – Special coatings, trim materials, and connections

✅ ​​Global Certifications​​ – CE, CRN, API Monogram, GOST

​​Request CVS curves, sizing guides, or CAD models!​