發布時間：2022-07-14瀏覽量：1676
The high platform national standard flanged ball valve is a relatively new type of ball valve, and it is roughly the same type of valve as the national standard flanged gate valve. The only difference is that its closing part is a sphere, and the sphere rotates around the center line of the valve body to achieve the purpose of opening and closing the valve. Now, let's introduce the opening and closing process of the high platform national standard flanged ball valve in detail.
Opening process: First, in the closed position, the ball is pressed against the valve seat by the pressure of the valve stem. And when we turn the handwheel counterclockwise, the valve stem moves in the opposite direction, and its bottom angled flat disengages the ball from the valve seat. When the valve stem continues to lift and interacts with the guide pin in the helical groove of the valve stem, the ball starts to rotate without friction until the fully open position, and the valve stem is lifted to the limit position.
Closing process: When closing, turn the handwheel clockwise, the valve stem will start to descend and let the ball leave the valve seat and start to rotate. And when we continue to turn the handwheel, the valve stem will be acted by the guide pin in the upper helical groove, so that the valve stem and the ball will rotate 90 ° at the same time, and then turn the handwheel for the last few turns, the angular plane at the bottom of the valve stem The machine will press the ball, so that the ball is tightly pressed against the valve seat to achieve a complete sealing effect.
