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A sealing assembly for a valve with a rotary actuating shaft includes a top seal formed of a plastic diaphragm and a metal diaphragm, both of which are in sealing relationship with the actuating shaft. The metal diaphragm has a cantilever supported lip that is spring fitted into resiliently biased r

A sealing assembly for a valve with a rotary actuating shaft includes a top seal formed of a plastic diaphragm and a metal diaphragm, both of which are in sealing relationship with the actuating shaft. The metal diaphragm has a cantilever supported lip that is spring fitted into resiliently biased relationship with the actuating shaft. The sealing surface of the metal diaphragm provides a fire-tested seal in the event that the seal of the plastic seal is destroyed by fire.

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A valve assembly, comprising: a) a valve body, said having an inlet and a outlet and an internal flow passage extending therebetween; b) a fluid control member movably disposed in the internal flow passage between the inlet and the outlet, said fluid control member being operative to control the flo

A valve assembly, comprising: a) a valve body, said having an inlet and a outlet and an internal flow passage extending therebetween; b) a fluid control member movably disposed in the internal flow passage between the inlet and the outlet, said fluid control member being operative to control the flow of a process fluid through said valve body in accordance with the its position relative to said valve body, said valve body having an access opening for assembling and accessing said fluid control member; c) an actuating shaft interconnected with said fluid control member, said actuating shaft having a cylindrical surface that extends axially outwardly from the fluid control member to a position outboard of the valve body, the outboard end of said actuating shaft being adapted to mechanically interface with a actuating element positioned external to said valve body for effectuating rotation of the fluid control member within said valve body; d) a valve cover for enclosing the access opening, said actuating shaft extending through the valve cover; and e) a sealing assembly surrounding the actuating shaft adjacent the access opening, said sealing assembly including: i) a metal diaphragm located intermediate of the valve cover and the fluid control member, the metal diaphragm extending from the valve body to the actuating shaft and providing an electrical path therebetween, said metal diaphragm having a central opening through which said actuating shaft extends with a groove adjacent to and circumferentially surrounding the central opening, the groove having a first sidewall defining an axially extending cylindrical surface adjacent to and in contact with the cylindrical surface of the actuating shaft, and a second sidewall obliquely oriented with respect to the first sidewall; and ii) a plastic diaphragm located intermediate of the metal diaphragm and the fluid control member, said plastic diaphragm being sealingly engaged with the periphery of the access opening and extending radially inwardly therefrom toward the actuating shall, said plastic diaphragm having a central opening through which said actuating shaft extends with a groove adjacent to and circumferentially surrounding the central opening, the groove of the plastic diaphragm having first and second sidewalls in generally parallel relationship to the respective first and second sidewalls of the metal diaphragm, the first sidewall of the plastic diaphragm defining an axially extending cylindrical surface adjacent to and in contact with the cylindrical surface of the actuating shaft, the configuration of the first and second sidewalls of the groove in the plastic diaphragm being conformed to and partially contained within the groove of the metal diaphragm.