BALL VALVES

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a floating ball valve uses a ball as the structure to close the cross-section of the pipe and prevent the flow of the fluid. Now, the main feature of a floating ball valve is that the ball has no structure to support it, so it stays suspended in the fluid and in place by valve seats.

 The trunnion ball valve is an essential device for regulating the flow of fluids- steam, gas, or oil in pipeline. It is quarter-turn designs with a ball capable of rotating 90 degrees on its axis to either block or allow the flow of fluid. These valves have a spherical disk design at the center, which rotates to regulate the start-stop flow cycle. The disk often called the ball comes designed with a small protruding shaft at the top and bottom which are mechanically supported. In this case, flow is controlled by the position of a hole in the center of the ball. For their versatility, Trunnion mounted ball valves are useful in industries where such shut-off operation is required. 

 Since the ball of the floating ball valve is not restricted by any component, when the valve is closed, the medium is pressed from one end upstream) of the valve, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end (downstream) of the valve, thus producing an outlet seal. As shown in Figure 3 

 The Trunnion ball valves have adequate backing for the ball. The support is in shape similar to a shaft, and it’s called a trunnion. The Trunnion soaks up any additional pressure coming from the flow, thereby lowering the pressure on the valve seat and the ball. Trunnion mounted ball valves find their use in large-scale implementations that require low operating torque.