| 摘要 |
PROBLEM TO BE SOLVED: To maintain performance, such as combustion and an output, of a gas instrument in an excellent state even when a plurality of fuel gases are used in parallel. SOLUTION: A proportional valve 20 set in a control range for LPG and a first solenoid valve 21 to open and close a gas flow passage are situated on a first gas pipe 17, in the order from an upper stream. A second proportional valve 22 set in a control range for DME and a second solenoid valve 23 are situated, in the order, from an upper stream on a second gas pipe 18. In the case LPG is supplied, the first solenoid valve 21 is opened to form a gas supply route, and a first gas pipe 17 is used. In the case DME is supplied, the second solenoid valve 23 is opened to form a gas supply route and a second gas pipe 18 is used.
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