Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 17/10 (2006.01) G05D 16/16 (2006.01)

Patent

CA 2397908

A pilot operated safety relief valve (14) in which a pilot valve (32) controls the opening and closing of the main valve member (26). The pilot valve (32) has a spindle valve member (70) between an intermediate dome fluid chamber (52) and an exhaust chamber (54) communicating with exhaust port (52) and exhaust line (38). Spindle valve member (70) has an annular sealing mem-ber of membrane (104) having a relatively thin body (105) with op-posed beads (106, 108) along inner and outer peripheries of body (105) for sealing between spindle valve member (70) and the ad-jacent retainer sleeve (94). Any positive backpressure forces from exhaust line (38) are balanced against spindle valve member (70) by annular seal (80) and membrane (104). Membrane (104) is effective for sealing between spindle valve membre (70) and retainer sleeve (94) without generation of frictional forces therebetween thereby to permit precise actuation of main valve member (70) within the tol-erance of the relieving pressure specified for pilot valve (32).

L'invention concerne une soupape de sûreté (14) actionnée par une soupape pilote (32), cette dernière régulant l'ouverture et la fermeture de l'élément soupape principal (26). La soupape pilote comporte un élément soupape axial (70) placé entre une chambre de fluide à dôme intermédiaire (52) et une chambre d'évacuation (54) communiquant au moyen d'un orifice (52) d'évacuation et d'une ligne (38) d'évacuation. L'élément soupape axial (70) comporte un élément ou une membrane (104) d'étanchéité dont le corps (105) est relativement mince présentant des boudins opposés (106, 108) le long des périphéries interne et externe du corps (105) de façon à sceller l'élément soupape axial (70) et le manchon de retenue (94) contigu. Toute force de contre-pression positive provenant de la ligne (38) d'évacuation est compensée, par rapport à l'élément soupape axial (70), par le joint étanche annulaire (80) et la membrane (104). Cette dernière (104) est efficace pour sceller l'élément soupape axial (70) et le manchon de retenue (94) sans produire des frottements entre eux, ce qui permet un actionnement précis de l'élément soupape principal (70) dans la plage de tolérances de décompression spécifiée pour la soupape pilote (32).

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