| 摘要 |
<p>The present invention provides water supply shutoff device ( 10 ) for use with a water supply pipe ( 16 ). The device comprising a body ( 12 ) having water inlet ( 18 ) connectable to the upstream side of the water supply pipe, an water outlet ( 20 ) connectable to the downstream side of the water supply pipe, and a passage through said body connecting said water inlet to said water outlet ( 20 ). The body further includes a valve ( 26 ) operable close said passage and control means including an acoustic sensor ( 28 ) operable to detect the flow of water through the device, a timer and a drive means for the valve, the control means being arranged to operate the drive means to close the passage in response to water flowing through the device for a time period in excess of a predetermined time period. The device further includes a member ( 43 ) arranged in the passage to promote turbulence in the flow of water through the passage, which turbulence is detectable by the acoustic sensor ( 28 ).</p> |
