Ball valve has cavity, in which ball can move, which is smaller than cavity linking fluid inlet and outlet channels, whose size can be adjusted by adjusting gap between lower end of the valve stem and valve seat
摘要
<p>The ball valve has a cavity (8), in which the ball can move. This is smaller than the cavity (6) linking the fluid inlet and outlet channels and its size can be adjusted by adjusting the gap between the lower end of the valve stem and the valve seat (14).</p>
