Patent ID: 8636174
Filing Date: 2014-01-28
Classification: B67D

Abstract:
1. A method of dispensing hot water from a dispenser at a preselected temperature on-demand, comprising the steps of: providing a source of relatively hotter water by maintaining hot water in a hot water tank at a preselected temperature and a preselected head pressure; providing a source of relatively coot water at a temperature less than the preselected temperature, said source of cooler water and the source of hotter water being the only sources of water; sensing when an outlet dispense valve has been actuated to an open state; dispensing water from the hot water tank with a solenoid controlled hotter water valve at a substantially constant, preselected flow rate to an inlet of a mixing chamber in response to the outlet dispense valve being sensed to be in an actuated open state; dispensing cooler water to another inlet of the mixing chamber through a cooler water solenoid controlled fill valve feeding a pulse-width modulated proportional valve in response to the outlet dispense valve being sensed to be in an actuated state; sensing the temperature of mixed water in the mixing chamber with a temperature sensor mounted within a temperature sensor mounting inlet of the mixing chamber; controlling the proportional valve in response to the temperature sensor to pass water out of the mixing, chamber at a preselected temperature when the dispense valve being actuated to a an open state; passing mixed water from an outlet of the mixing chamber to the dispense valve in response the dispense valve being actuated to an open state; and closing the cooler water fill valve and the hotter water solenoid controlled valve in response to the dispense valve being sensed to not being in the open state; and providing the mixing chamber as a central junction of a four legged cross-joint with one leg connected to the hotter water source, a second leg connected to the cooler water source through the proportional valve, a third leg containing the temperature sensor, and a forth leg connected to the dispense valve.