| 摘要 |
A cistern for connecting to a low pressure hot water supply network containing two float valves, one float valve being positioned above an ejector contained within the cistern and arranged to eject water from the cistern upon opening of that float valve to thereby further lower water level and open that float valve still further, so that kinetic energy of flow of discharge from the float valve is utilised in lieu of elevation of the cistern to provide head for hot water flow, the second float valve being arranged to discharge directly into the cistern after the first has partially opened to thereby prevent hunting of the first float valve.
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