| 摘要 |
<p>The invention relates to a shower control valve assembly which includes a casing mountable in a wall with inlets for hot and cold water. A cartridge is insertable into the casing in one of two orientations so that the hot water inlet of the cartridge can be aligned with either one of the casing inlets, depending on which one is the hot water inlet. The casing has two outlets, one for the shower and the other for the tub. There is an integral bypass which takes water from the tub outlet to the shower outlet upon activation of a diverter valve. The cartridge is of the pressure and temperature balancing type, with water of the desired temperature flowing to the tub outlet and then to the tub or shower as desired. The cartridge uses a rotatable mixing valve disc having arcuate ports therethrough for hot and cold water, each port being alignable with a corresponding passage in the cartridge that communicates with an inlet chamber for water of the appropriate temperature. The thickness of the valve disc at each port diminishes from a maximum to a minimum and a cam surface is provided adjacent each port. Within each passage is an axially movable seat member that has an annular surface in constant contact with the cam surface and an opposite annular surface that is sealable against an O-ring held by a snap seal member to prevent water flow through the seat member and the mixing valve disc. The snap seal member allows water flow therepast and is biased towards the disc, but when the axially movable seat member is in sealing contact with the O-ring, no water can pass to or through the valve disc. With this configuration wear is minimized and it is not necessary to use toxic lubricants to maintain smooth action of the valve disc.</p> |
