Abstract: A pushbutton activated water pressure balanced mixing valve for faucets and shower/tub discharge controls includes a housing, a valve sleeve having hot and cold water inlets and a mixed water discharge and a valve member. The valve member has a hot water passage communicable with the sleeve hot water inlets and the sleeve mixed water discharge and a cold water passage communicable With the sleeve cold water inlet and the sleeve mixed water discharge. The housing has an outlet connected to the sleeve mixed water discharge. The valve member has generally equal pressure balancing surfaces and there is a passage in the housing connected to the sleeve discharge and to each of the pressure balancing surfaces for applying water pressure onto the surfaces for causing water temperature modulation movement of the valve member within the sleeve. There is also a passage connecting each of the pressure balancing surfaces with the housing outlet.

Abstract: A hot and cold water mixing valve for use with faucets, shower/tub controls and other plumbing fittings includes a sleeve having a hot water inlet and a cold water inlet spaced therefrom and an outlet axially spaced from the inlets. There is a stem movable within the sleeve to control water flow from the inlets to the outlet. There is a water passage between the exterior of the stem and the interior of the sleeve and there is an axially extending air passage within the stem having an outer end in communication with air at ambient pressure. There are air outlets in the stem intermediate its ends which connect the air passage with the exterior of the stem. The stem exterior and the sleeve interior cooperate to provide an anti-siphon device to draw air from the air outlets into the water passage.