| 摘要 |
PROBLEM TO BE SOLVED: To provide a drainage trap preventing close contact of a valve element and ensuring a good draining efficiency when water is drained and a good closability when water is not drained. SOLUTION: A pipe port serving as a drainage outflow port is diagonally tilted, and a drainage trap comprises an oscillating valve element 4, which is freely oscillationally supported on an oscillating shaft and capable of opening and closing the pipe port by moving into and out of contact with the pipe port from below, the oscillating shaft being provided at the upper end of a tilted face at the pipe port, and a balance weight 43 energizing the valve element 4 in its closing direction. One or more small projections are formed at the part of the pipe port making contact with the oscillating valve element 4, to support the oscillating valve element 4 at their apexes.
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