Ball Valves
Ball valves perform a quarter turn on/off or modulating function. A flow-controlling ball located within the body of the valve contains a hole through its center along one axis, which connects the inlet and outlet ports of the body. The ball itself is held in place by, and rotates 90ยบ within, PTFE seats. These provide permanent lubrication and keep the valve 'bubble-tight.' They are backed by elastomeric cushions, which provide pressure against the ball and at the same time compensate for wear.