A ball valve has a valve body having a chamber, aligned inlet and outlet passages providing flow therethrough, and an access passage communicating with the chamber.Ball Valves A replaceable cartridge assembly is seated in the chamber and includes a generally spherical ball having a flow passage therethrough alignable with the inlet and outlet passages,Check Valves A resiliently deflectable biasing member acts upon the inlet end of the cartridge body and a deflector is movable between a first position in which the biasing member is substantially free from deflection and a second position in which the biasing member is deflected to bias the cartridge body and the outlet valve seat against the wall of the valve body chamber to effect a seat-to-body seal.

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