| 摘要 |
<p>A milk flow indicator comprises a housing in which the milk is adapted to flow upwardly through a seat coacting with a non-return valve means having a density higher than that of the milk. The valve means are movable upwardly by said milk flow to a first, open position and are movable downwardly, upon cessation of said milk flow, to a second, closed position under the influence of gravity, the sinking velocity and distance of movement of the valve means being such that movement of the valve means to said second position takes place after a predetermined time delay.</p> |
