| 摘要 |
<p>The present invention relates to a dual check valve for a noise reduction type small boiler which includes first housing (110) having a first diaphragm (111) having a first through-hole (112); a first check valve plate (120) elastically installed inside the first housing (110) to close the first through-hole (112); second housing (130) installed consecutively after the first housing (110), and having a second diaphragm (131) having a second through-hole (132) formed; and a second check valve plate (140) elastically installed inside the second housing (130) to close the second through-hole (132), and having a weight portion (144). According to the present invention, operation cycles of each of valve plates frequently operated by expansion of hot water are varied and the valve plates are configured to interfere with each other by a dual check valve structure using the first valve plate and the second valve plate having the weight portion, thereby remarkably reducing vibration caused by the operation, and thus remarkably reducing noise generated during the operation.</p> |
