| 摘要 |
A valve mechanism for application to a liquid container such as a beer keg to enable liquid in the container to be dispensed through a connector by the application of top pressure to the liquid within the container wherein the valve mechanism includes a locking ring by means of which the connector may be secured in position on the valve mechanism and wherein the locking ring has arcuate teeth which are inclined on the underside and arcuate openings between the teeth characterised in that the teeth of the locking ring are specially shaped so that the locking ring can be removed only by using a specially shaped unlocking tool adapted to fit the locking ring and further characterised in that the special shaping of the locking ring includes the provision of inclined surfaces between the teeth and the openings so that the teeth merge into the openings at one end of each tooth, the inclined surfaces being so positioned that any attempt to remove the locking ring by means of an unauthorised tool is frustrated due to the fact that the unauthorised tool simply rises up on the inclined surfaces and does not turn the locking ring. |
