Plug valve

A one piece seal retainer assembly for a plug valve body comprising a top portion and body portion insertable within a plug valve having an inlet and an outlet, said plug has an orifice extending therethrough, a seal receiving means in an outer wall of said plug valve, said seal retainer assembly removably mounted on said seal-receiving means, a seal interposed between said seal-receiving means and at least a portion of said seal retainer assembly to form a seal, the seal-receiving means in the plug wall comprising a cavity therein in non-communicating relationship to said orifice and a seal-receiving groove having an angled wall surface to accommodate a seal, the body portion of the seal retainer assembly being narrower than the top portion to form a ledge at the juncture between the body and top portions to receive the seal, said body portion being removably mounted in said cavity and movable therein, said seal being interposed at least partially between the ledge and the angled wall surface of the seal-ring groove and in contact with both, said seal retainer assembly being on substantially the same level as said inlet and outlet whereby when the plug is moved to an inoperative position the top portions of the seal retainer assembly will be in axial alignment with said inlet and outlet, whereby fluid from said inlet will strike the seal retainer assembly moving it within said cavity to angled wall surface to effectively seal the entire cavity to prevent any leakage therethrough.

A plug for a plug valve having an inlet and an outlet, said plug having an outer wall and an orifice extending therethrough, seal-retainer receiving means in the plug outer wall spaced from said orifice, said seal retainer receiving means including seal-receiving means, a seal retainer assembly removably mounted in said seal-receiving means, a seal interposed between said seal-receiving means and at least a portion of said sealing retainer assembly to form a seal, said seal retainer assembly having a top portion and body portion, the seal-receiving means in the plug wall comprising a cavity therein in non-communicating relationship to said orifice and a seal-receiving groove having an angled wall surface to accommodate a seal, the body portion of the seal retainer assembly being narrower than the top portion to form a ledge at the juncture between the body and top portions to receive the seal, said body portion being removably mounted in said cavity and movable therein, said seal being interposed at least partially between the ledge and the angled wall surface of the seal-receiving groove and in contact with both, said seal retainer assembly being on substantially the same level as said inlet and outlet of the valve body, said plug movable from an operative position in which the orifice connects with the inlet and the outlet to allow fluid to pass from the inlet to the outlet to an inoperative position in which the orifice disconnects from the inlet and the outlet to prevent fluid from passing from the inlet to the outlet, whereby when the plug is moved to its inoperative position the top portion of the seal retainer assembly will be in axial alignment with the valve body inlet and outlet to allow fluid from said inlet to strike the seal-retaining assembly moving it within said cavity to cause it to compress the seal between the ledge and the angled wall surface to effectively seal the entire cavity to prevent any leakage therethrough.