fully welded ball valve is a type of ball valve where the valve body is manufactured as a single, fully welded piece, without body flanges or bolts. This construction enhances strength, eliminates external leakage paths, and makes it particularly suitable for long-term buried or high-pressure applications, especially in pipelines for oil, gas, and district heating systems.
fully welded ball valve is a robust, maintenance-free valve with a welded body that eliminates external leakage. Its main advantages are high safety, long life, and suitability for underground and high-pressure pipelines.
Structure of fully welded ball valve
Valve Body – Fully welded steel structure, seamless, no body flanges or bolts.Ball – Precision machined and often hard-chrome or electroless nickel plated for durability.
Stem – Typically anti-blowout design, connected to the ball with a trunnion or floating mechanism.
Seats – Soft-seated (PTFE, reinforced PTFE) or metal-seated depending on medium and temperature.
Sealing Design – Often dual sealing (primary soft seat + secondary metal-to-metal seat).
Actuation – Operated manually with a lever/gearbox or automated using pneumatic, hydraulic, or electric actuators.
Features & Performance of fully welded ball valve
No External Leakage: Welded body removes potential leak paths from flanged joints.High Strength & Pressure Resistance: Suitable for medium- to high-pressure pipelines.
Long Service Life: Protected ball and seat design, often with self-lubricating seats.
Maintenance-Free: Since the body cannot be opened, it’s designed for long-term maintenance-free operation.
Buried/Underground Use: Excellent corrosion resistance with external coatings, ideal for buried pipelines.
Fire-Safe Design: Many designs comply with API 607 / ISO 10497 fire-safe standards.
Anti-Blowout Stem: Increases safety in high-pressure service.
Low Torque Operation: Seats often designed to reduce operating torque, enabling easier actuation.
Application Cases of fully welded ball valve
Oil & Gas Pipelines
Long-distance natural gas transmission lines
Crude oil and refined product pipelines
Underground installations requiring zero leakage
District Heating & Cooling Systems
Buried valves in hot water or steam pipelines
Heating networks in urban systems
Petrochemical Plants
High-pressure process lines requiring reliability and safety
Power Industry
Steam and condensate pipelines
Cooling water lines
City Gas Distribution
Underground gas pipeline distribution networks
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