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Non Return Valve
1. Product Overview
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
By Design Type
|
Type |
Operation |
Max Pressure |
Applications |
|
Swing Check |
Hinged disc swings open |
PN40 (ASME 300) |
Water, wastewater |
|
Lift Check |
Piston lifts vertically |
PN100 (ASME 600) |
High-pressure steam |
|
Dual Plate (Wafer) |
Two spring-loaded plates |
PN25 (ASME 150) |
Oil & gas pipelines |
|
Ball Check |
Ball moves with flow |
PN16 |
Pumps, compressors |
|
Tilting Disc |
Disc tilts at 15-30° angle |
PN63 (ASME 400) |
High-velocity flows |
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
|
Parameter |
Specification Range |
|
Size Range |
DN15–DN2000 (½"–80") |
|
Pressure Rating |
PN10–PN420 (ASME 150–2500) |
|
Temperature Range |
-196°C to +540°C (material dependent) |
|
Cracking Pressure |
0.05–0.5 bar (adjustable in some models) |
|
Flow Velocity |
0.3–5 m/s (optimal range) |
4. Seal & Spring Options
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
✔ 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
|
Industry |
Recommended Type |
Key Feature |
|
Water Treatment |
Swing Check |
Low maintenance |
|
Oil & Gas |
Dual Plate Wafer |
Fast response |
|
Power Plants |
Lift Check |
High-pressure steam |
|
Chemical |
Alloy 20 Ball Check |
Acid resistance |
|
Marine |
Bronze Swing Check |
Saltwater proof |
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
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?
✅ 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!
Ce que nos clients disent de nous
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20, rue Xingyuan Sud, comté de Zaoqiang, ville de Hengshui, province du Hebei, Chine
