A valve body defining an inlet and an outlet; a ball supported in the valve body between the inlet and the outlet, and having an open position to conduct a fluid from the inlet to the outlet, and a closed position substantially preventing the flow of the fluid from the inlet to the outlet; Ball Valvesvalve control means connected to the ball to move the ball between the open and closed positions; sealing means supported within the valve body for movement between a disengaged position, wherein the sealing means is spaced from the ball, and an engaged position wherein the sealing means engages the ball and develops a fluid tight seal between the ball and valve body, said sealing means being biased toward the engaged position; retraction means supported within the valve body for movement toward and away from the sealing means, the retraction means being biased toward the sealing means; and a cam member mounted on the ball control means for movement therewith;Ball Valves and wherein as the valve control means moves the ball from its open position to its closed position, the cam member engages and moves the retraction means away from the sealing means, and the sealing means moves into its engaged position; BALL VALVESand as the valve control means moves the ball from its closed position to its open position, the cam member becomes spaced from the retraction means, and the retraction means engages and pushes the sealing means from its engaged position to its disengaged position.

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