| 摘要 |
A counter flow prevention trap of a sewer pipe in an apartment house is provided to prevent sewage from flowing backward from the sewer pipe by simplifying structure and accurately operating. A counter flow prevention trap of a sewer pipe includes a cylindrical body(10), an upper cover(20) combined with an upper part of the body and provided with a drain port(21), a lifting unit(30) inserted to the body and moved up and down, a float(40) attached to a lower part of the lifting unit, a couple of springs(50) installed between the body and the lifting unit to restrict the lifting unit from shaking or turning, a contact rubber(60) installed in the lifting unit to close the drain port, and a drain plug(70) having plural penetration holes installed in the drain port. The lifting unit is moved up as the float is lifted, when sewage flows upward from a sewer pipe(2). The contact rubber is moved up together with the lifting unit, so that the drain port is closed. |
