| 摘要 |
<p>A pair of hard material plaques for a hot and cold water mixer valve, comprising a fixed and a movable plaques, each having two windows for passage of hot and cold water respectively, wherein the inner and outer edges of the windows are defined by circular arcs, and the edges of the windows, which cooperate with one another in the closure position, are of equal radius and are concentric in the closure position of the plaques. Due to this provision the control of admitted water quantity, by diametrical displacement of the movable plaque, and the control of mixing ratio, by rotational displacement of the movable plaque, do not interfere with one another. Preferably the remaining edges of the windows are circular arcs too, and the radial width of all windows, measured along a specific diameter, is also equal.</p> |
