| 摘要 |
<p>A toilet cistern refill mechanism for refilling a toilet cistern after each flushing, which produces minimal noise during the refill process. The mechanism includes a valve device 26 which can open to pass water to a vertical outlet tube 36 that empties into the bottom of the cistern 12. An anti-siphon air tube 62 near the top of the outlet tube has an upper end 66 open to the atmosphere and a lower end 64 facing downwardly along the outlet tube. A restriction 72 in the outlet tube, below the air tube, causes water to fill the outlet tube and at least the bottom of the air tube for a water inlet pressure of at least 20psi. The water at the bottom of the air tube prevents air from being dragged into the downwardly facing air tube, to avoid the noise that would result from such air flowing through the air tube and bubbling out of the bottom of the outlet tube.</p> |
