F - Mech Eng,Light,Heat,Weapons – 16 – J
Patent
F - Mech Eng,Light,Heat,Weapons
16
J
277/43
F16J 15/30 (2006.01) F16J 15/18 (2006.01) F16K 41/02 (2006.01)
Patent
CA 1172667
ABSTRACT OF THE DISCLOSURE Combined metal-to-metal/compliant material stem sealing means for high pressure, balanced, rising stem gate valve includes at least one seal set at each of the actuator and bal- ance stems. Each seal set comprises a pair of frustoconical metal ring gaskets between which are disposed two make-up rings of complaint, tough material of high lubricity, e.g. tetra- fluoroethylene polymer. One make-up ring is adjacent to one gasket, and the other make up ring is adjacent to the other gasket. A core ring of material that expands substantially less volumetrically upon heating than the make-up rings, e.g. com- pacted graphite, is disposed between the make-up rings. Around the inner periphery of the core ring adjacent the respective actuator or balance stem is disposed a bearing ring of material like that used for the make-up rings, e.g. tetrafluoroethylene polymer. The seal set is compressed by a packing retainer such that the metal gaskets are coined into metal-to-metal sealing engagement with the stems and adjacent valve body parts. The sandwich stack, consisting of the core ring and bearing ring disposed between the make-up rings, is deformed to conform to the shape of, and fills substantially all of the space between, the compressed metal ring gaskets. The volume of the core ring is approximately one-third of the total volume of the sandwich stack. F1521/C
408465
Gibson Duane E.
Herd David P.
Cameron Iron Works Usa Inc.
Smart & Biggar
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