How do Ball Valves Works?
Ball valve is evolved from plug valve. It has the same action of rotating 90 ° and the same rotating parts often in contact with the sealing seat. The plunger is spherical and has a circular through hole or channel through its axis. The ratio of the spherical surface to the channel port should be such that when the ball rotates 90 °, all spherical surfaces should appear at the inlet and outlet, so as to cut off the flow.
The ball valve can be closed tightly only by rotating 90 ° and a small rotating torque. The completely parallel inner cavity of the valve body provides a very small resistance and direct flow channel for the medium. Even with shrinkage, the pressure drop caused by the medium passing through the valve is still very small. Most of today's ball valves have been used from an economic point of view. However, the valve required on the pipeline cleaned with "pig" is the most common exception.
It is generally considered that the ball valve is most suitable for direct opening and closing, but recent development has designed the ball valve to throttle and control flow.
