| 摘要 |
<p>The present invention relates to an air vent for wastewater piping and, more particularly, to an air vent for wastewater piping, comprising: an air sheet moved up/down according to a pressure state inside wastewater piping, thereby opening/closing a vent outer passage, such that outer air flows into the wastewater piping or wastewater is prevented from leaking to the outside; and a guide frame ring provided around a full circumference of a hollow portion of the air sheet and made of a material having a predetermined degree of rigidity such that, in the process of moving up/down of the hollow portion of the air sheet, which is guided by an elevating guide, the hollow portion is guided to smoothly move up/down without being folded, while flexibility of the air sheet is not compromised, thereby ensuring an excellent sealing property.</p> |
