Fluid flow control valve with bi-directional shutoff

Details Fluid flow control valve with bi-directional shutoff Fluid flow control valve with bi-directional shutoff

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 5/20 (2006.01)

Patent

CA 2479725

A control valve (20) of the ball type with bi-directional shutoff capabilities is disclosed. The ball valve including an inlet (31) and an outlet (32), a ball element (80) and a seal assembly (50). When closing the valve, the ball element, which is eccentrically mounted on a shaft (90, 91), rotates to abut the seal assembly. While closed, the seal assembly including a seal housing (52), a main seal (64) and a resilient member (70), contacts the ball element at the main seal, while the resilient member biases the main seal toward the ball element. The seal assembly further includes a secondary flowpath (72) between the main seal and seal housing, which is restricted by two unidirectional seal rings (60a, 60b).

L'invention concerne un robinet de réglage (20) du type à sphère présentant des capacités de sectionnement bidirectionnel. Ce robinet comprend un orifice d'admission (31) et un orifice de sortie (32), une sphère (80) et un ensemble d'étanchéité (50). Lorsqu'on ferme le robinet, la sphère, qui est montée excentrée sur un arbre (90, 91), tourne afin de venir buter contre l'ensemble d'étanchéité. Lorsqu'il est fermé, l'ensemble d'étanchéité, qui comprend un logement d'étanchéité (52), un joint principal (64) et un élément résilient (70), vient en contact avec la sphère au niveau du joint principal, tandis que l'élément résilient pousse le joint principal vers la sphère. L'ensemble d'étanchéité comprend également, entre le joint principal et le logement d'étanchéité, une voie de passage secondaire (72) limitée par deux bagues d'étanchéité unidirectionnelles (60a, 60b).

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