| 摘要 |
The device 301 is arranged to control a flow of water through a central heating system comprising a plurality of zones (1-4, figure 2). The device comprises a plurality of distribution ports 304A-D, which are preferably inlet ports receiving return water from one or more radiators located in each of the zones, and a shared port 305, which is preferably an outlet port connected to a return pipe leading to a boiler of the central heating system. Each distribution port corresponds to one of the plurality of zones. Flow of water through each of the distribution ports is controlled by the device so that flow is selectively prevented or permitted to any number of the plurality of zones. A cam 302 or double-cam (704,709, figure 7) can be used to open or close the distribution ports by rotating with respect to cam followers 306A-D provided on each of the distribution ports. The position of the double-cam can be monitored and thus controlled using micro-switches (710, figure 7) so that the double-cam is rotated to a desired position. |
