We Are Open 24 Hours a Day, 7 Days a Week, Including Weekends and Public Holidays.
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!
Lo que nuestros clientes dicen de nosotros
DIRECCIÓN
20 Xingyuan South Street, condado de Zaoqiang, ciudad de Hengshui, provincia de Hebei, China
