Fully Welded Ball Valve is a type of ball valve designed with a fully welded structure, where the valve body is connected to the pipeline via welding, eliminating traditional flange or threaded connections. It is widely used in industries such as oil, natural gas, chemicals, heating, and power, particularly excelling in high-pressure, high-temperature, large-diameter, and high-reliability applications.
Structural Features:
Seamless Welding, High Structural Integrity
The valve body is permanently connected through high-precision welding (e.g., butt welding, TIG welding) using two hemispherical or segmented components, forming an integrated structure with the pipeline. For example, in long-distance natural gas pipelines, the ball valve is directly welded into the pipeline, eliminating potential leakage points associated with flange connections.
Precision Internal Design
The ball is rotated (typically 90°) by the stem to open or close, with a precision fit between the ball and seat. The seat sealing ring is often made of carbon fiber-reinforced PTFE or reinforced polytetrafluoroethylene to ensure sealing under high temperature and pressure.
Material Adaptability
The valve body material is selected based on the medium's properties, such as carbon steel (A105, LF2) for general service and stainless steel (F304, F316) for corrosive media. The welding groove undergoes liquid penetrant testing, and carbon steel components undergo electroless nickel plating to enhance corrosion resistance.
Order Specification
Design standard: API 6D, API 608, ISO 17292
Pressure range: CLASS 150-2500 LB
Nominal diameter: NPS 2-60 Inch
Body material: Carbon steel, Stainless steel, Duplex stainless steel, Alloy steel, Nickel alloy
End connection: RF, RTJ, BW
Mode of operation: Lever, Gearbox, Electric, Pneumatic, hydraulic device, Pneumatic-hydraulic device
Contact us for API 6D, API 608, ISO 17292 Fully Welded Ball Valve, 2-60 IN: sale@gneetube.com