| 摘要 |
In a valve apparatus for controlling fluid flow wherein the apparatus comprises a valve assembly and valve housing; the valve housing including a valve chamber incorporating fluid inlet and outlet conduits and a valve seat; and the valve assembly including a valve stem and collar; the stem adapted to rectilinear but limited movement within said collar including a terminal flange extending into said valve chamber; a stop ring disposed about said valve stem and in spaced relation thereto below the level of said collar; a swivel bearing cup having a rim engaging abutting said terminal flange of said valve stem; and a resilient, compressible valve diaphragm mounted about said valve stem and swivel bearing cup within said chamber; the improvement that includes, among other novel features, a radial space provided between the upper portion of said neck of said valve stem and the inner diameter of said stop ring such that said space comprises up to about 160 percent of the thickness of said diaphragm neck.
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