초록 ▼

An improved valve having a body with an inlet, an outlet, a valve chamber, a valve seat, a valve member movable in the valve chamber toward and away from said valve seat, a stem connected to said valve member a bonnet connected to and forming a part of the body a part of the body in the stem extendi

An improved valve having a body with an inlet, an outlet, a valve chamber, a valve seat, a valve member movable in the valve chamber toward and away from said valve seat, a stem connected to said valve member a bonnet connected to and forming a part of the body a part of the body in the stem extending therethrough and an improved sealing assembly for sealing around the stem including a seal ring of extrudable material and means providing a space into which said seal ring extrudes to form a sealing lip extending toward the pressure and responsive to pressure exerted on the sealing assembly. Also the improved sealing assembly includes mating tapered wedging and seal rings having a small angle mating taper wedge the rings into sealing engagement with the walls against which they are to seal.

대표청구항 ▼

A valve comprising a body having an inlet, an outlet, a valve chamber, and a valve seat surrounding communication between said inlet and said outlet, a valve member positioned within said valve chamber, a valve stem extending through said body and connected to said valve member, a bonnet surrounding

A valve comprising a body having an inlet, an outlet, a valve chamber, and a valve seat surrounding communication between said inlet and said outlet, a valve member positioned within said valve chamber, a valve stem extending through said body and connected to said valve member, a bonnet surrounding said valve stem, means for moving said valve stem to move said valve member toward and away from said valve seat to control flow therethrough, a seal ring of extrudable material positioned between said stem and said body, rings positioned on opposite sides of said sealing ring between said valve stem and said body, means adjacent said seal ring providing a recess opening toward the pressure side of said seal ring, a base ring having an annular upstanding rim with inner and outer shoulders at the base of said rim, said seal ring and said other rings forming a first stack positioned on the interior of said rim on said inner shoulder, a second stack of a seal ring and rings similar to the rings on said inner shoulder positioned in the exterior of said rim on said outer shoulder, means adjacent said seal ring of said second stack providing a recess opening toward the pressure side of said seal ring, means engaging said rim and said stacks independent of said body and stem for preloading said stacks of rings upon installation to obtain an initial pressure seal between said stem and said bonnet and said seal rings extruding into their respective recess to provide sealing lips in such recesses when pressure is within said bonnet to provide a more effective seal between said stem and said bonnet when the stacks are responsive to interior bonnet pressure.