| 摘要 |
This invention relates to a valve assembly for granular and/or abrasive materials. The valves comprises a housing having an inlet and an outlet wherein the ratio of the outlet diameter to inlet diameter is no less than 1:1 for unrestricted flow of materials through the valve assembly. There is an annular recess in the housing adjacent the valve seat containing a resilient inflatable sealing ring, the ring being dimensioned so as to sealably contact the closure member when the closure member is in the first position upon inflation of the ring. A fluid inlet supplies a fluid under pressure to the sealing ring to inflate the sealing ring. A shaft channel and contains an external hub disposed on the outer end of the shaft which hub is dimensioned and arranged so as to engage the housing to restrict longitudinal movement of the shaft in the channel. The hub is connected to the outer end of the shaft by axial connection means which engages the hub and shaft together so as to restrict axial movement of one with respect to the other in a manner which limits the imposition of any radially directed impact forces upon the shaft associated with connection of the hub to the shaft.
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