Válvula de bola de muñón

When larger size and higher pressure ball valves are needed, trunnion ball valves appear. The trunnion ball is fixed in the main body through the bottom trunnion (short connecting rod) and the top rod. Due to the inability of the ball to float into the valve seat for reliable closure, the valve seat must float onto the ball. The design of the trunnion seat causes it to be excited by upstream pressure and forced into the sphere for sealing. Because the ball is firmly held in place, apart from its 90° rotation, extraordinary fluid forces and pressure will not clamp the ball into the valve seat. On the contrary, the force only acts on a small area around the floating seat.