| 摘要 |
<p>PCT No. PCT/GB90/01370 Sec. 371 Date Apr. 30, 1991 Sec. 102(e) Date Apr. 30, 1991 PCT Filed Sep. 5, 1990 PCT Pub. No. WO91/03408 PCT Pub. Date Mar. 21, 1991.A check valve (170) for the discharge passageway of an aerosol dispensing package, comprising: a chamber (171) having inlet and outlet openings (175,174) for in-line connection in the passageway; a dished seat (176) extending across the chamber between the openings with its dished surface facing towards the outlet opening; and a ball (177) housed in the chamber for free movement between substantial sealing engagement with the outlet opening and direct engagement in the seat; the ball being gravitationally engaged in the seat when the chamber is in a generally upright position with the outlet opening uppermost, the seat acting to deflect discharge flow through the chamber around the ball in these last circumstances, and the dished surface being outwardly divergently shaped to cause the ball to roll therefrom under gravity and move to its outlet opening sealing engagement when the chamber is inclined from the upright position by a substantially predetermined angle towards a horizontal disposition.</p> |
