Fluid control apparatus comprising: a valve body having first and second ends with first and second openings respectively, extending completely therethrough generally along a first axis, said valve body having internal circumferential wall means substantially defining a chamber intermediate of said first and second valve body ends; Ball Valvesa ball mounted on said wall means in a manner to rotate about a second axis substantially normal to said first axis, said ball having spherical surface portions around a cylindrical hole extending completely therethrough defined by an internal surface alignable with said valve body first end first opening, said alignment being made possible by the rotatability of said ball; a seal assembly sealing said valve body first end first opening to said ball, said seal assembly including an annular seal extending around said hole at a diameter greater than that of said hole when said alignment occurs; and bias means mounted between said valve body and said seal assembly to force said seal into fluid tight engagement with said ball,Ball Valves said first and second openings being in communication with each other during said alignment, said ball being rotatable to a position cutting off all communication between said first and second openings; and movable means engageable with said seal assembly to move at least a portion thereof in a direction to eliminate the force produced by said bias means which would otherwise cause said seal to be pressed into fluid tight engagement with said ball to permit easy movement of said ball and seal assembly relative to each other,BALL VALVES said seal assembly including a ring approximately concentric with said first axis, said bias means including a spring to bias said ring toward said ball, said movable means including first and second shafts rotatable through and sealed through said wall means on about the same third axis about normal to said first axis and on respective opposite sides of said valve body, means to hold said first and second shafts in at least substantially fixed axial positions along said third axis, each of said first and second shafts having an eccentric thereon inside said chamber engageable and disengageable with said ring to move the same to put the pressure of said seal on and take it off of said ball, respectively, by forcing said ring and said spring in a direction toward and away from said ball, respectively.

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