| 摘要 |
The present invention relates to a non-powered backflow prevention apparatus, provided at a sewer, a sluice of an agricultural waterway and the like so as to prevent the backflow of sewage without power, and comprises: a body part having a through-hole in which an inlet through which the sewage flows is disposed at the front thereof and an outlet through which the sewage is discharged is disposed at the rear thereof; and an opening and closing door part rotatably hinge-coupled to one side of the outlet of the body part so as to open and close the outlet of the body part, wherein the opening and closing door part can comprise: a plurality of buoyant members generating buoyancy by means of the sewage flowing backwards toward the outlet of the body part, and arranged to have a predetermined gap therebetween; and a guide part disposed above the plurality of buoyant members so as to close the outlet of the body part by means of the buoyancy of the buoyant members and to guide, to the outlet of the body part, the sewage flowing from the inlet of the body part when the sewage flowing backwards is removed such that the outlet of the body part is opened by the load itself of the opening and closing door part. |
