| 摘要 |
<p>The container valve housing is provided with two concentric bearing walls having different heights, the outer bearing wall being fitted with a gasket which is traversed by the valve stem and the inner bearing wall being applied against the gasket so as to form an internal chamber which communicates with the product to be dispensed. An annular wall between the two bearing walls is provided with filler openings and with at least one independent calibrated bleeder orifice or tap for the admission of propellant gas from the headspace of the container into the internal chamber.</p> |
