Design of Rotary Valve Seat of Fully Welded Ball Valve

    We know that the fully welded ball valve is a valve with very superior performance, especially when used in natural gas long-distance pipelines. The main reason is that the fully welded structure has excellent sealing performance and its use The long-life and unique rotary valve seat design is inseparable.

    We know that conventional valve seats are basically fixed. After a long time of operation, the damaged position is also fixed. This inevitably prevents internal leakage. Moreover, in a fully welded ball valve, When it is just opened or close to the fully closed state, the narrow point between the valve ball and the valve seat will be scoured at high speed, which greatly increases the wear rate and causes leakage. This is due to the throttling of natural gas. The cause of high-speed turbulence. Therefore, a unique rotary valve seat design was chosen later. The principle of this design is that when the ball valve is opened or closed, the upstream and downstream valve seats will be moved by the paddles on the valve ball and then rotated about 15 degrees. At this time, the entire valve seat seal is alternately affected by natural gas. For scouring, the same part will be scoured again after the ball valve is opened or closed 12 times, so that the wear of the entire valve seat remains uniform and the working life is greatly extended.