Brewer, Richard D.,Balkwill, Anthony W.,Helm, Stephen D.,Fielding, John,McGlasson, Stuart A.,Hodson, Peter D.,Charnock, Paul A.,Howgill, Stephen J.,Graves, Jason A.,Jackson, Graham V.,Shaw, Rachael V.
申请号：
AU2008308723
公开号：
AU2008308723B2
申请日:
2008.10.02
申请国别(地区):
AU
年份:
2012
代理人:
摘要：
An aerosol metering valve comprising: (a) a valve stem movable between a restposition and a firing position comprising: a body portion comprising a circumferentialsealing surface (b) a valve body comprising: a body wall, and an internal chamberdefined at least in part by the body wall； and (c) a metering gasket having an innerperiphery defining an aperture, being disposed near the most interior end ofthe internal chamber and being configured to be able to form a transient, substantiallyfluid-tight face seal against the circumferential sealing surface of the valvestem, where at the rest position of the valve stem, the body portion of the valvestem is located within the internal chamber and as the valve stem is moved fromits rest position towards its firing position the circumferential sealing surfaceof the valve stem contacts the metering gasket to form a face seal thereby closinga metering chamber and thereafter further movement of the valve stem towardsits firing position causes the metering gasket to deflect while maintainingthe seal with the circumferential sealing surface of the valve stem； and whereinthe metering gasket in an unbiased configuration is an annular disc having a substantiallyplanar form and where the valve is constructed and arranged such that the innerperiphery of the metering gasket is urged out of said substantially planar format the rest position of the valve stem, or wherein the metering gasket is pre-biasedinto a dished-shape.
