Welded High-Pressure Check Valve
- Butt-Weld Connection, Zero External Leakage: Utilizes a butt-weld connection to form a fully sealed, integral unit with the pipeline, fundamentally eliminating the risk of external leakage.
- Engineered for High Pressure: The valve body is typically made from high-quality forged steel with a reinforced wall thickness and structure to withstand extreme operating pressures.
- Reliable Sealing, Long Life: The disc and seat sealing surfaces are overlaid with hard alloys, providing excellent resistance to erosion, wear, and high temperatures, ensuring long-term reliable sealing under high pressure differentials.
- Robust Construction: Its solid overall structure effectively withstands pipeline stresses and the effects of thermal cycling.
- Automatic Operation: Requires no external power, relying on the force of the medium itself to perform its opening and closing actions.
The Welded High-Pressure Check Valve is a specialized check valve designed for high-pressure service, connected to the piping system via butt-weld ends. This connection method eliminates the potential leak paths of flanged joints and provides a structural integrity equal to that of the pipe itself, making it one of the safest and most reliable connection types for high-pressure, high-temperature applications. Internally, it typically features a lift-check design where the disc opens automatically under medium pressure and closes upon flow reversal to prevent backflow and protect upstream equipment. This valve is widely used in sectors with extreme safety and durability requirements, such as thermal power plants, nuclear power, and petrochemical industries.
Product Specification
| Item | Standard |
|---|---|
| Design | ASME B16.34, API 6D |
| Structure Length | ASME B16.10 |
| Welding End | ASME B16.25 |
| Test and Inspection | API 598 |
| Pressure and temperature reference | ASME B16.34 |
Performance Parameter
| Parameter | 600(Lb) | 900(Lb) | 1500(Lb) |
|---|---|---|---|
| Nominal Pressure PN (MPa) | 10.0 | 15.0 | 25.0 |
| Case Test Pressure (MPa) | 15.0 | 22.5 | 37.5 |
| High-pressure Sealing Test pressure (MPa) | 11.0 | 16.5 | 27.5 |
| Maximum Working pressure (MPa) | ≤10.4 | ≤15.6 | ≤25.8 |
Main Components Material
| Part Name | Material (High Temp & Pressure) |
|---|---|
| Body/Cover | A217 WC6, WC9 |
| Disc | A217 WC6, WC9 (with STL face) |
| Sealing Face | Overlaid STL Alloy |
| Bolt/Nut | A193 B16 / A194 4, A193 B7 / A194 2H |
| Temperature | ≤ 570°C |
| Medium | Water, Steam, Oil under high temp & pressure |
No drawing available.
