Control valve for vessel gas water heater

Abstract

A control valve for a vessel gas water heater includes a single governor for controlling a wider range of the flow of gas from pilot supply to main supply. Once an ignition knob 1 is pressed and turned to open the magnetic valve V1 and ignite the pilot burner PB, the magnetic valve V1 is maintained open by the electromotive force of a thermocouple TC heated by a pilot flame c. When the ignition knob 1 is released from being pressed, and turned further to open the plunger valve V3, the boiler is shifted to the standby state for enabling the supply of gas to the main burner MB. Meanwhile, a sensor rod B is mounted in a reservoir A for contracting and expanding depending on the temperature of the hot water in the reservoir A to open and close the snap valve V5, thus controlling the combustion and its cancellation in the main burner MB. Accordingly, the temperature of the hot water in the reservoir A can automatically be controlled in the vessel gas water heater. In particular, a single governor is provided in which the seat tightness between its valve V4 and valve seat is improved with the use of at least a rubber molding 17a and the gas valve V4 is prevented from tilting by a guide pin 20 freely fitted in a shaft 18 of the valve, thus controlling the flow of gas to the main burner MB and to the pilot burner PB for a wider range from main supply to pilot supply.

Dependencies are inferred from the claim text.