Pressure relief valve

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

Patent

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Details

F16K 17/04 (2006.01) F16K 15/03 (2006.01) F16K 17/38 (2006.01)

Patent

CA 2178629

A pressure relief valve, for pressurised fluid storage vessels such as a rail tank car for volatile liquids, has a flap valve (16) for rotational movement in a valve passage between a closed position seated on a valve seat (18) and blocking the passage and an open position in which the passage is substantially unobstructed. A spring arrangement (52) for keeping the valve closed against a rated pressure includes an externally mounted spring system which, when exposed to fire conditions which might threaten the wall strength of the vessel, loses spring temper so as to reduce the closing pressure of the valve. The flap valve is supported through an arm by a ball joint (19) allowing a limited pivotal movement, and the valve seat is located in the valve passage by an O-ring (20) allowing a limited degree of float in its own plane.

Une soupape de sûreté, destinée à des cuves de stockage pour fluides sous pression telles que des wagons-citernes pour fluides volatils, comporte une soupape (16) à clapet destiné à un mouvement de rotation dans un passage de soupape, entre une position fermée où le clapet est en butée sur un siège (18) de soupape et où le passage est bloqué, et une position ouverte où ce passage est pratiquement libre. Un dispositif (52) à ressort, destiné à maintenir cette soupape fermée à l'encontre d'une pression étalonnée, comporte un système de ressort à montage externe qui, s'il est exposé à des situations d'incendie pouvant menacer la résistance des parois de cette cuve, perd de sa force de compression, ce qui réduit la pression de fermeture de la soupape. Cette soupape à clapet prend appui par l'intermédiaire d'un bras sur un joint à rotule (19) permettant un pivotement limité, et le siège de soupape est positionné dans le passage de soupape par une bague (20) permettant un flottement limité par rapport à son propre plan.

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