| 摘要 |
A water mixing valve for mixing hot water from a combi-boiler with cold water from a cold-water supply, the water mixing valve including a hot-water flow controller defining a hot-water flow path 32 of variable cross-section and a cold-water flow controller defining a cold-water flow path 34 of variable cross-section. A temperature controller 24 simultaneously operates the hot and cold-water flow controllers to provide a user-selectable outlet water temperature. The hot and cold-water flow controllers operate in tandem so that, for a mid-range portion of operation, the total through-flow of water is substantially constant. However, the hot-water flow controller operates at at least one end of the range of operation to vary the total through-flow of water and, hence, extends the temperature range achievable by the water mixing valve. |
