Patent ID: 7108011

Claim:
A self closing cartridge for a single handle faucet comprising a casing and a substantially solid piston within the casing, the improvement comprising: the piston being molded of a very high temperature ultra lubricated plastic resin or corrosion resistant metal alloy; the cartridge having diametrically opposed water outlets in the casing and having a water outlet about a periphery of the piston which aligns with the outlets in the casing; the cartridge further having water inlets in the casing and water inlets in the piston wherein water flows throughout the cartridge when the piston inlets align with the casing inlets; and a biasing spring inserted between the piston and a bottom end of the casing to assist hydraulic self closure of the cartridge and to mechanically shear away and mechanically digest any contaminant deposits in the area of the spring.