| 摘要 |
<p>A closure (1) for a container, which has a self-closing valve (3) having a cup-shaped valve head (32) with a dispensing aperture (6) defined therein. In response to increased pressure in the container, the head (32) of the self-closing valve (3) is designed to flatten and partially invert, thereby opening the dispensing aperture (6). The closure (1) includes an energising ring (5) arranged surrounding the valve head (32) and adapted to restrict the radial expansion thereof. The position and design of the energising ring (5) relative to the valve head (32) may be adjusted to affect the performance of the valve allowing a single valve design to be used for a number of different applications. Alternatively the energising ring (5) may be used to improve the performance of a particular design of valve.</p> |
