EN 14341 is the European standard specifying the design, manufacturing, material, testing and inspection requirements...
EN 14341 is the European standard specifying the design, manufacturing, material, testing and inspection requirements for steel check valves used in industrial applications. The standard applies to forged, cast and fabricated steel check valves installed in steam systems, water networks, process plants, power stations and petrochemical facilities.
What is EN 14341?
EN 14341 establishes technical requirements for check valves designed to permit flow in one direction and automatically prevent reverse flow. The standard covers flanged, wafer, butt-weld, socket-weld and threaded end connections.
Scope of Application
- Steam Systems
- Condensate Networks
- Water Systems
- Industrial Gas Systems
- Chemical Processing Plants
- Power Generation Facilities
- Marine Applications
- Petrochemical Installations
Valve Types Covered
- Swing Check Valves
- Lift Check Valves
- Piston Check Valves
- Tilting Disc Check Valves
- Dual Plate Check Valves
- Wafer Check Valves
Operating Principle
Check valves operate automatically through fluid pressure. Forward flow lifts or rotates the closure element, while reverse flow forces the closure element against the seat, preventing backflow.
Body Configurations
| Pattern | Description |
|---|---|
| Straight Pattern | Straight-through flow path |
| Angle Pattern | 90-degree flow redirection |
| Oblique Pattern (Y-Type) | Reduced pressure drop configuration |
Typical Body Materials
| Material | Typical Grade |
|---|---|
| Carbon Steel Castings | 1.0619 / GP240GH |
| Stainless Steel Castings | 1.4308 |
| Stainless Steel Castings | 1.4408 |
| Chrome-Moly Steel | 13CrMo4-5 |
| Chrome-Moly Steel | 10CrMo9-10 |
End Connections
- Flanged
- Wafer
- Butt Weld
- Socket Weld
- Threaded
Size Range
The standard covers nominal sizes from DN 8 up to DN 1000 depending on valve type and pressure rating. Socket-weld and threaded valves are generally limited to DN 65.
Pressure Ratings
| Designation | Typical Ratings |
|---|---|
| PN | PN10, PN16, PN25, PN40, PN63, PN100 |
| ASME Class | Class 150, 300, 600 |
| Socket Weld / Threaded | Class 600, Class 800 |
Design Requirements
- Pressure-retaining body strength
- Reliable non-return operation
- Closure element integrity
- Resistance to hydraulic shock
- PED compliance support
- Temperature-compatible material selection
Inspection and Testing
EN 14341 valves are commonly tested according to EN 12266 for shell strength, leakage and operational verification.
- Shell Strength Test
- Seat Leakage Test
- Backflow Verification
- Operational Test
- Visual Inspection
- Dimensional Verification
Typical Industrial Applications
Steam Systems
Protection of steam traps, condensate lines and steam headers.
Water Pumping Stations
Prevention of reverse flow into pumps.
Power Plants
Feedwater systems and auxiliary process services.
Chemical Industry
Protection against reverse process flow.
Marine Applications
Seawater, fuel oil and utility systems.
Related Standards
| Standard | Scope |
|---|---|
| EN 14341 | Steel Check Valves |
| EN 12266 | Valve Testing |
| EN 12516 | Valve Design Strength |
| EN 558 | Face-to-Face Dimensions |
| PED 2014/68/EU | Pressure Equipment |
Conclusion
EN 14341 is the principal European standard for steel check valves. Through standardized requirements for design, materials and testing, it ensures reliable reverse-flow protection in industrial, energy, marine and process applications.