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Fully Welded Ball Valves

Extended Stem Welded Ball Valve

  • Extended Stem Design: The valve stem can be lengthened according to burial depth or specific operational needs, facilitating easy operation from the ground level.
  • No Valve Chamber Required, Cost-Saving: The valve can be directly buried, eliminating the need for large underground chambers and significantly reducing civil engineering costs and construction time.
  • Fully Welded Body: The integral welded body is robust and durable, fundamentally eliminating the risk of external body leakage.
  • Long-Term Maintenance-Free: Engineered for long-term reliable service, typically requiring no regular maintenance, adjustments, or lubrication.
  • Multiple Safety Features: Equipped with fire-safe and anti-static designs; select models also feature emergency seat sealant injection and automatic cavity pressure relief for enhanced safety.
Download Spec

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.