Patent ID: 6971556

Claim:
A pressurised aerosol dispenser comprising a container ( 2 ) for material to be stored therein and dispensed therefrom, and a metering dispensing valve ( 1 ); said metering dispensing valve ( 1 ) comprising a generally cup-shaped metering vessel ( 7 ) held in place by means of a cap ( 3 ) fixedly mounted upon said container ( 2 ), and a sealing member ( 9 ) disposed between the metering vessel ( 7 ) and the cap ( 3 ), said sealing member ( 9 ) having an opening within which a valve stem ( 8 ) is mounted for sliding movement along a longitudinal axis, the metering vessel ( 7 ) having an open mouth, an internal surface of which defines an annular contact surface ( 24 , 25 ) against which said sealing member ( 9 ) bears, wherein said contact surface ( 24 , 25 ) comprises a first outwardly-flared portion ( 24 ) disposed at a first angle to said longitudinal axis and a second outwardly-flared portion ( 25 ) disposed at a second angle to said longitudinal axis, said second angle being greater than said first angle such that an annular ridge ( 26 ) is formed at the junction between said first outwardly-flared portion ( 24 ) and said second outwardly-flared portion ( 25 ).