| 摘要 |
<p>An apparatus for dispensing product from a container (10) in which first (36) and second (40) members are provided in a vessel (32) which is disposed in the container (10). The first member (36) defines with the vessel (32) a first chamber (38), and the second member (40) defines with the first member (36) a second chamber (46). One of the members moves in response to the pressure in the container (10) to a first position relative to the other member and pressure is exerted in the second chamber (46) on said second member (40) to move it to a second position in response to the pressure in the container (10) decreasing below the predetermined pressure. When the second member (40) moves to the second position the first chamber (38) is connected with the container (10) to permit the pressurized gas in the first chamber (38) to pass to the container (10) and when the second member (40) moves to the first position this connection is disconnected to prevent the passage of the gas.</p> |
