| 摘要 |
A container comprises a flexible body member (2) closed by a cap portion (26) having an outlet (28) therein, and a control assembly within the cap portion for controlling liquid flow from the body member (2) to the outlet (28). The control assembly comprises an integrally moulded seating (6) for location on the body member (2), including an outer annular sleeve (8) and an inner valve support chamber (12) interconnected by a plurality of thin, circumferentially-spaced webs (10) whereby a substantially unstricted flow path is defined between the sleeve (8) and the chamber (12), and a control valve (16) of a one piece plastic moulding located on the seating (6) to define a closed volume therebelow and to seal the outlet (28), the arrangement being such that, on pressurisation on the interior of the body member (2), the pressurized liquid flows between the sleeve (8) and the chamber (12) to distort the control valve (16) and enable flow through the outlet (28), and, on release of said pressure, the control valve (16) returns to a position sealing the outlet (28). Preferably the closed volume within the seating (6) below the control valve (16) is vented to atmosphere.
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