| 摘要 |
A make-up water supplying valve of a boiler comprising an air gap forming unit according to the present invention supplies make-up water to a heating water pipe by a simple manipulation of rotating an operation knob, and forms an air gap in the make-up water supplying valve automatically when the supply of the make-up water is completed. Because a complete separation state between a heating water pipe and a direct water pipe is maintained by the air gap formed in the make-up water supply valve, the make-up water supplying valve can block inflow of the backward flown heating water from flowing into the direct water pipe even when the heating water is leaked from the heating water pipe and flows backward. |
