Any valve that checks flow by the seating of a ball.
A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.
Valve that works by the action of external pressure raising a ball and thereby opening a hole.
An example is the valve used in toilet water tanks to cut off the water supply when it reaches the correct level. It consists of a flat rubber washer at one end of a pivoting arm and a hollow ball at the other. The ball floats on the water surface, rising as the tank fills, and at the correct level the rubber washer is pushed against the water-inlet pipe, cutting off the flow.