| 摘要 |
PURPOSE:To improve relatively throttling performance (minimum input/maximum input), by so constituting the titled burner that two burners are provided so as to decide the minimum input at the lower limit of a stable combustion range by only either of the two burners and the maximum input as a total of both the burners. CONSTITUTION:Both passages such as a first fuel gas passage 4 to a first burner 1 and a second fuel gas passage 5 to a second burner 2 are so constituted that they are connected with a fuel gas supply pipe 7 through a flow control valve 6. As for the flow control valve 6, fuel gas is supplied to only the first fuel gas passage 4 while the valve 6 is in a state extending from a fully-closed state to an intermediate opening state and the fuel gas is supplied to both the first fuel gas passage 4 and the second fuel gas passage 5 while the valve 6 is in a state extending from the intermediate opening state to a fully-opened state. With this construction, throttling operation is easy and throttling performance (minimum input/maximum input) can be improved drastically.
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