Pneumatic ball valve was evolved from the plug. It has the same movementrotated 90 degrees, is the cock body is different sphere, there are circularholes or channels through its axis. Just use the pneumatic ball valve pneumatic actuator gas source is rotated90 degrees Used for the operation and a small torque can be closed tightly. Thebody cavity of full equality for the media to provide a little resistance,through the flow channel. http://www.51orders.com/showroom/Pneumatic-Ball-Valve.htm