| 摘要 |
A mixture control hot and cold water valve, with one handle for volume control and one for mixture control, is described. A longitudinally ported, rotatable and axially movable valve plug, operable by two concentric stems, controls mixture by rotation of a valve element between hot and cold inlets, and volume by axial travel between an open position and a closed position wherein a washer on the stem is engaged with a seat in the valve housing around the valve plug. The washer is on a washer-carrier having a screw threaded connection to the valve, and also to an inner stem member, whose extremity carries a volume control knob. A handle rotates the outer stem member through a limited arc to correspondingly rotate the valve plug and thus accomplish mixture control. A tubular boss projects from the valve body around the stem means, and a barrel screwed thereto houses substantially the remainder of the stem means. A ferrule screwed onto this barrel acts through a packing to yieldingly resist rotation of an outer stem member relative to the barrel. Thus the outer stem member can be turned for mixture control. By taking off the handles, and screwing off the ferrule, the stems, together with washer-carrier and valve rotor can be pulled out of the valve body and the barrel for easy inspection or repair of the washer.
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