Electromechanical temperature regulation system for providing tempered mix water

摘要

A thermostatic mixing valve is used in a tempered water blending system. A cold water bypass line in the system acts under the control of a modulating valve and electronic controller to divert cold water back to a temperature sensing element in the mixing valve. By flooding the temperature sensing element, the mixing valve detects a false temperature and adjusts its flow rate of hot and cold water accordingly. The electronic controller acts in reverse of normal fashion, providing negative feedback to the sensing element of the mixing valve.

主权项

1. A system for supplying tempered water, the system comprising:
a cold water inlet conduit connected to a source of cold water; a hot water inlet conduit connected to a source of hot water; a thermostatic mixing valve operatively connected to said cold and hot water inlet conduits for mixing water from the cold and hot water inlet conduits into a single tempered water output stream having a desired set point temperature, the thermostatic mixing valve having a temperature sensing element for controlling the mixing valve position to maintain the desired set point temperature in the tempered water output stream; a tempered water outlet conduit for receiving the tempered water stream, the tempered water outlet conduit having a temperature sensing element located therein; a cold water bypass line for diverting cold water from the cold water inlet conduit upstream of the thermostatic mixing valve and for supplying cold water directly to the temperature sensing element of the thermostatic mixing valve without being mixed with hot water, to thereby flood the temperature sensing element; a modulating valve located in the cold water bypass line for controlling the flow of water in the cold water bypass line; an electronic controller operatively associated with the modulating valve and responsive to changes in temperature sensed by the temperature sensing element located in the tempered water outlet conduit for controlling the flow of cold water to the sensing element of the thermostatic mixing valve.