A two-way flow control ball valve device having an improved valve seat for an O-ring seal so that there is no binding or restriction on the movement of the ball under high pressures. Ball ValvesIncludes a housing having different diameter openings at opposite ends with the opening at the smaller end defining a fixed valve seat and a combined removable adapter plug and valve seat mountable in the larger end. Ball ValvesThe housing is designed for mounting of the ball valve so that BALL VALVESthe seal connection between the valve steam and the operating lever can be made from the outer side of the housing after the valve has been mounted therein. 

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