| 摘要 |
1,138,336. Valves. CISTERNS Ltd. 1 April, 1966 [6 April, 1965], No. 14622/65. Heading F2V. A float-actuated cistern-supply valve of the diaphragm or sliding type has a discharged spigot which fits into a silencing pipe resting on the cistern bottom, the pipe being of such a size as to provide an annular aperture, above the water level for the admission of air into the pipe to prevent back-flow due to syphoning. |
