Patent ID: 8534315

Claim:
A diaphragm assembly for use with a fluid control device, comprising: a plurality of housings to be coupled to a fluid control device to define a plurality of chambers, the chambers to comprise a first portion and a second portion, the first portion to be fluidly coupled to an outlet pressure of the fluid control device; tie rods to extend through the housings to couple the housings to the fluid control device; a stem defining an aperture therethrough and a seating surface adjacent an end of the stem, the seating surface to be removably engaged by a valve stem to enable an overpressure to vent through the aperture to the atmosphere, wherein each of the chambers is spaced along the stem which is at least partially disposed in the chambers, and wherein the stem is to move to control a flow of fluid through the fluid control device; a plurality of diaphragm rings to surround and be operatively coupled to the stem, wherein the diaphragm rings comprises a sleeve and a rim, each sleeve defining an aperture through which the stem is to extend and each rim comprising a portion extending substantially perpendicularly from the sleeve; and a plurality of first diaphragms to separate the first and second portions, each of the first diaphragms is disposed in a corresponding one of the chambers and which is coupled to the stem to move the stem in response to the outlet pressure of the fluid control device, wherein one or more of the first diaphragms is positioned between opposing first sides of the diaphragm rings, the rim comprising an annular gripping surface to seal against an adjacent first diaphragm, an annular groove is defined by each of the diaphragm rings between the annular gripping surface and the sleeve.