Combined pressure regulator and shut-off valve

G - Physics – 05 – D

Patent

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Details

G05D 16/10 (2006.01)

Patent

CA 2397895

A regulator valve (10) includes first (68) and second (96) plungers movable in a housing toward and away from the seal member (58). The plungers (68, 96) are sealed to the housing and have passages (72, 100) therethrough. The plungers (68, 96) are biased toward the seal member (58) by fluid pressure at the housing outlet end (46) and away from the seal (58) by a spring (66). First (80) and second (108) diaphragms connected to the plungers (68, 96) engage the housing inner wall in sealing engagement so that fluid must flow through the passages (72, 100). The diaphragms (80, 108) and housing define an expansion chamber (118). A port (40) in fluid communication with the expansion chamber (118) to force the first plunger (68) into engagement with the seal member and prevent flow through the passages (72, 10).

Selon l'invention, une soupape de régulation (10) comprend un premier (68) et un second (96) piston pouvant se déplacer dans un boîtier vers et en direction opposée d'un élément d'étanchéité (58). Les pistons (68, 96) sont fixés au boîtier et présentent des passages (72, 100) à travers celui-ci. Les pistons (68, 96) sont poussés vers l'élément d'étanchéité (58) par une pression fluidique à l'extrémité de sortie de boîtier (46) et en direction opposée de l'élément d'étanchéité (58) par un ressort (66). Une première (80) et une seconde (108) membrane, reliées aux pistons (68, 96), forment un accouplement étanche avec la paroi interne de boîtier de sorte que le fluide doit circuler à travers les passages (72, 100). Les membranes (80, 108) et le boîtier définissent une chambre d'expansion (118). Un orifice (40) se trouve en communication fluidique avec la chambre d'expansion (118) afin de forcer le premier piston (68) à s'accoupler avec l'élément d'étanchéité et d'éviter l'écoulement par les passages (72, 10).

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