Pressure regulating valve

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 83/14 (2006.01)

Patent

CA 2511747

Disclosed is a pressure control valve which reduces the increased internal pressure in an aerosol spray can that is filled with compressed gas to a working pressure level for a spray valve (12). Said valve comprises a control piston (52) which is maintained in a state of equilibrium by means of a restoring force and a sealing location (66, 68) which is closed when the pressure in a pressure control chamber (84) exceeds the control pressure level. In order to prevent the control accuracy from being falsified as a result of the decreasing pressure inside the can during continuous removal, the inventive pressure control valve is provided with a sealing device (86, 66, 67) which seals a free end of the piston (52, 74) against the pressure inside the can and the control pressure such that the variable pressure inside the can is no longer able to act upon any axial surface of the piston (52) and the control accuracy is improved in spite of a potentially smaller piston surface.

L'invention concerne une valve de régulation de pression servant à réduire la pression interne élevée d'une bombe aérosol, laquelle est remplie d'un gaz comprimé, à un niveau de pression de fonctionnement adapté à une valve de pulvérisation (12). Cette valve de régulation de pression comprend un piston de régulation (52) qui est maintenu en équilibre au moyen d'une force de rappel, ainsi qu'une zone d'étanchéité (66, 68) qui est fermée lorsque la pression dans la chambre de régulation de pression (84) dépasse le niveau de la pression de régulation. Selon l'invention, pour empêcher que la précision de régulation soit faussée en raison d'une réduction de la pression interne de la bombe aérosol lorsque le produit est expulsé en continu, cette valve de régulation de pression est pourvue d'un système d'étanchéité (86, 66 ; 67) qui assure l'étanchéité d'une extrémité libre du piston (52, 74) vis-à-vis de la pression interne de la bombe aérosol et de la pression de régulation. De cette manière, la pression interne variable de la bombe aérosol ne peut plus agir sur aucune surface axiale du piston (52) et la précision de régulation est améliorée, bien que le piston puisse présenter une surface réduite.

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