F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/35
F16K 5/00 (2006.01) F16K 5/06 (2006.01) F16K 5/20 (2006.01) F16K 5/22 (2006.01)
Patent
CA 1041981
ABSTRACT OF THE DISCLOSURE A plug valve is disclosed having a valve chamber with inlet and outlet flow passages in fluid communication therewith, at least one of the flow passages having a generally cylindrical seat recess formed therein about the flow passage and an axially moveable seat assembly disposed therein. The valve includes improved means for biasing the sealing assembly against the plug member and cleaning the space between the sealing assembly and the valve body, namely a plurality of conduits extending from the interior surface of a flow passage to a shoulder surface of its associated seat recess and providing for fluid communication between those surfaces. In the preferred embodiment of this invention, wherein the plug is spherical and rotatably mounted on upper and lower trunnions, the lower end of the lower trunnion is mounted in a trunnion cap, and a limit stop is incorporated therein comprising a projection on the trunnion cap and a cooperating recess in the trunnion. A novel sealing assembly is disclosed for use in the preferred embodiment, including a seat ring and overfitting retainer ring defining an annular groove, an elastomeric sealing element being tightly held therein under radial and axial compression and projecting through an opening in the groove to contact the plug in sealing engagement therewith.
241168
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