Patent ID: 7464722

Claim:
A fluid proportioning valve, the valve comprising: a valve housing having an inlet port, an outlet port and a valve cavity between the inlet and outlet ports; a valve guide disposed in the valve cavity and having an inlet in communication with the inlet port of the valve housing and an orifice in communication with the inlet, the valve guide defining a spring cavity; a spring disposed in the spring cavity; a retaining ring disposed in the spring cavity against which the spring acts; a metering valve disposed in the valve cavity about the valve guide, the metering valve having a metering edge controlling flow through the valve guide orifice; and a coupler having a cylindrical body and enlarged head joining the metering valve to the valve guide so as to permit relative movement of the metering valve with respect to the valve guide along a valve axis, wherein the coupler captures the retaining ring and the spring within the spring cavity; whereby the metering edge of the metering valve changes position with respect to the valve guide orifice to deliver from the outlet port pressurized fluid from the inlet port in proportion to a pressure drop between the inlet and outlet ports.