What Is The Sleeve Of A Lined Ball Valve?

What is the sleeve of a Lined Ball Valve? This is a question many customers frequently ask. The sleeve of a fully welded ball valve is a short section welded to each end of the valve. It serves as a transition piece added to each end of the ball valve for welding to the pipeline terminal or underwater manifold. To prevent damage to the seal of the fully welded ball valve body during sleeve welding, the sleeve is generally required to be welded before the ball valve leaves the factory. To facilitate subsequent welding to the pipeline, the sleeve must be made of the same material as the pipeline and its length must ensure that the heat generated during welding does not affect the sealing performance of the fully welded ball valve. The sleeve should be welded to the valve body before the fully welded ball valve is inspected. The signal pressure point and power source openings for the gas-hydraulic actuator should be located on the sleeve. The sleeve can be purchased by the fully welded ball valve manufacturer, provided by the ball valve purchaser with the material number and requirements, or it can be provided by the ball valve purchaser to the fully welded ball valve manufacturer. After the sleeve is welded to the fully welded ball valve, the weld must undergo a hydrostatic test, witnessed by a third party on site. The connection end of the fully welded ball valve sleeve and the pipeline should ensure the adaptability and weldability of the material strength (provide welding process qualification or welding test plate). The material and wall thickness of the process pipeline connected to the ball valve shall comply with national or international standards. The groove of the butt-welded connection end of the fully welded ball valve sleeve shall comply with the requirements of ASME B31.8.