| 摘要 |
A valve assembly for aerosol cans, in which the centre boss of the sheet metal mounting cup is crimped in such away, and at a point 17 below the enlarged head portion 13 of the valve housing 12, that the part of the boss above the crimp and around the valve housing bows outwards to provide clearance for "gassing". There are notches 23 in the lower part of the outside of the head portion but these stop short of the upper face of the head. The valve stem may also have external axial grooves 20 placed to increase the effective cross-sectional area during gassing. <IMAGE> |
