Patent ID: 7976701

Claim:
A drain trap comprising: a main body which has a tubular shape with a closed end and which includes an inner space communicated with a receiving unit and a discharge unit; a lid which covers the inner space; and a partition which partitions the inner space into a storage space and a discharge space, where the storage space stores liquid received from the receiving unit and the discharge space discharges liquid to the discharge unit, wherein the partition includes a tubular first partition and a second partition extending outward from around the circumference of the first partition, and can be inserted into the inner space, sealing units are installed all around circumferences of the partition and a side wall of the main body to bring part of the second partition into intimate contact with part of the side wall by exerting a vertical force component under a vertical pressing force, a slanting contact portion is provided for receiving the vertical pressing force to come into contact with at least part of the sealing units, and the partition is equipped with a valve disc which floats up to allow liquid to flow from the storage space to the discharge space when the liquid in the storage space reaches or exceeds a set amount as well as with a valve seat which catches and supports the valve disc.