Importance

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Abstract

A gas control valve in a water heater is provided for improving the ease of assembling, minimizing the size and the cost, and decreasing the limitation of layout design. For example, in a flame-retention, storage type closed vessel gas water heater for automatically controlling the temperature of hot water in a tank to a predetermined temperature, a cam member 3 having a pilot cam surface 3b, a main cam surface 3a, and an extinction cam surface 3c thereof arranged along one track is fixedly mounted on an ignition operating shaft 2 equipped with an ignition knob 1 for turning together and also arranged for direct engagement with the proximal end 13a of the valve pin 13 which has a pilot valve V1 fixedly mounted on the distal end thereof, a main valve V slidably mounted thereon below the pilot valve V1, and a main valve opening collar plate 14 fixedly mounted thereon below the main valve V as spaced by a given distance 'a' from the same so that the valve pin 13 can be shifted forward and backward by a predetermined sequence of actions of the cam member 3 to open and close the pilot valve V1 and the main valve V aligned along the axis of the valve pin 13 in response to the movement of the ignition knob 1 for controlling the supply of fuel gas to turn on and off the combustion of the water heater.

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First Claim