Ring sealed diaphragm

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 31/126 (2006.01)

Patent

CA 2706687

A diaphragm actuator (10) for a fluid process control device comprises a housing (26), a diaphragm (56), a stem (22), and a plate assembly. The plate assembly includes a concave plate (54) and a convex plate (52), each having inner and outer radial portions. The outer radial portions compressingly engage and retain the diaphragm. The inner radial portions are compressed together onto the stem between a shoulder (72) of the stem and a nut (48) threaded onto the stem. Accordingly, the concave plate forcibly engages and provides a fluidtight seal directly with the shoulder of the stem without requiring an o-ring or any other additional sealing component. Moreover, the concave and convex plates are structurally equivalent such that the actuator may easily be switched between a biased-open configuration and a biased-closed configuration.

L'invention porte sur un actionneur de diaphragme (10) pour un dispositif de commande de traitement par fluide, qui comporte un boîtier (26), un diaphragme (56), une tige (22) et un ensemble de plaques. L'ensemble de plaques comprend une plaque concave (54) et une plaque convexe (52), chacune ayant des parties radiales internes et externes. Les parties radiales externes mettent en prise et retiennent de façon compressive le diaphragme. Les parties radiales internes sont compressées ensemble sur la tige entre un épaulement (72) de la tige et un écrou (48) vissé sur la tige. Par conséquent, la plaque concave vient en prise avec force et fournit un joint étanche aux fluides directement avec l'épaulement de la tige sans avoir besoin d'un joint torique ou d'un quelconque autre composant d'étanchéité supplémentaire. De plus, les plaques concave et convexe sont de structure équivalente, de telle sorte que l'actionneur peut facilement permuter entre une configuration ouverte par sollicitation et une configuration fermée par sollicitation.

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