The Extended Stem Fully Welded Ball Valve is a specialized valve designed for pipelines installed underground or in remote locations. It builds upon the standard fully welded ball valve by incorporating a custom-length stem, which allows the valve's operating end to extend to the ground surface or an easily accessible point. This design enables the operation and control of deeply buried valves without the need for expensive valve chambers, significantly simplifying construction and reducing project costs. It retains the core advantages of a fully welded valve—no external leakage, high strength, and maintenance-free operation—making it the ideal choice for buried pipeline systems like city gas and district heating.
| Parameter | Specification |
|---|---|
| Nominal Diameter (DN) | DN15 - DN1200 |
| Pressure Rating | PN1.6 - PN4.0 MPa (Class150 - 2500) |
| Working Temperature | -29°C ~ 200°C |
| Body Material | Carbon Steel (ST37.0, A105, WCB), Stainless Steel (304, 316) |
| Ball Material | Stainless Steel (F304, F316) |
| Stem Material | 2Cr13, Stainless Steel |
| Seat Material | Reinforced PTFE (RTFE), PEEK, Nylon |
| Connection | Welded (BW), Flanged (RF, RTJ) |
| Actuation | Handle, Worm Gear, Bevel Gear, Electric, Pneumatic |
| Design Standard | API 6D, ASME B16.34, API 607 |
No drawing available.