Aerosol valves

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 83/54 (2006.01) A61M 15/00 (2006.01) B65D 83/14 (2006.01)

Patent

CA 2213442

A metered dose dispensing valve for dispensing metered volumes of a pressurised aerosol formulation, the valve comprising: a chamber (6), and a valve stem (12) extending into the chamber (6) and movable relative to the chamber (6) between non-dispensing and dispensing positions, the valve stem (12) having a configuration and the chamber (6) having an internal configuration such that a metered volume is defined therebetween and such that during movement between its non-dispensing and dispensing positions the valve stem (12) sequentially: (i) allows free flow of aerosol formulation into said chamber, (ii) defines a closed metered volume for pressurised aerosol formulation between the external surface of the valve stem (12) and internal surface of the chamber (6), and (iii) moves with said closed metered volume within the chamber (6) without decreasing the volume of said closed metered volume until said metered volume communicates with an outlet passage (10) thereby allowing dispensing of said metered volume of pressurised aerosol formulation.

Cette invention concerne une soupape de distribution dosée permettant la distribution de volumes dosés d'une formulation aérosol sous pression. Cette soupape comporte une enceinte (6) et une tige de soupape (12) rentrant à l'intérieur de ladite enceinte (6) et pouvant être déplacée par rapport à celle-ci entre une position de distribution et une position de non-distribution, ladite tige de soupape (12) ayant une configuration et ladite enceinte (6) ayant une configuration interne telles qu'un volume dosé y est défini et telles que lors de son déplacement entre les deux positions de distribution et de non-distribution, la tige de soupape (12) peut séquentiellement (i) permettre l'écoulement libre de la formulation aérosol à l'intérieur de ladite enceinte, (ii) définir un volume dosé fermé pour la formulation aérosol sous pression entre la surface externe de la tige de soupape (12) et la surface interne de l'enceinte (6) et (iii) se déplacer avec ledit volume dosé fermé à l'intérieur de l'enceinte (6) sans faire décroître le volume dudit volume dosé fermé jusqu'à ce que ledit volume dosé communique avec un orifice de sortie (10) et permette ainsi la distribution dudit volume dosé de la formule aérosol sous pression.

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