Valves

A valve comprising:

• a valve body having
• a central body portion having a chamber therein and oppositely disposed open ends,
• flange elements closing the open ends of the central body portion having flow ports which lead to the chamber, and
• a seat around the inner end of one of the flow ports;
• a closure element supported within the chamber for rotation about an axis to open and close the valve comprising a semispherical shell having
• a portion of its outer surface slidably engaged with the seat
• a flow opening which may be rotated into and away from registration with the one flow port in said valve body,
• a circular opening through the shell at one side, and
• a rectangular opening through the shell at the opposite side with its longer dimension directed parallel to the flow opening;
• cylindrical shaft means mounted with said valve body concentric with the axis of rotation and closely received within the circular opening of said closure element;
• and means extending through said valve body on the side opposite the side mounting said cylindrical shaft means for rotating said closure element about the axis to open and close the valve having square shaft means centered on the axis of rotation and received within the rectangular opening of said closure element whereby said closure element is movable toward and away from the seat when said closure element is in the closed position.