Expansion tank of atmospheric shut-off gas boiler

摘要

The present invention relates to an expansion tank of an atmospheric shut-off gas boiler, and more specifically, a strainer for filtering a foreign body included in the heating water is configured therein so that the circulation pump can be used as a bidirectional circulation pump. It relates to an expansion tank of a standby gas boiler that simplifies the structure of the entire boiler.;The expansion tank of the gas boiler according to the present invention has an expansion tank including a case 21 composed of a front plate 21a and a rear plate 21b and a diaphragm 22 installed between the front plate 21a and the rear plate 21b. In this case, the inlet 21c and the outlet 21d of the heating water are formed in the front plate 21a, and the strainer 27 is provided in the space formed by the front plate 21a and the diaphragm 22. It features.