| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain trap allowing a valve trap unit to be easily taken out of a casing to perform maintenance. SOLUTION: The valve trap unit 2 is stored while jointing a flange part 28 to the upper edge of the casing 3. A flange part 41 of a sleeve 4 is placed over the flange part 28, and a tubular body part of the sleeve 4 is inserted through an upper end opening part 52 of a cap 5. A screw part 54 of the cap 5 is screwed with a screw part 33 of the casing 3 to integrate the casing 3, the valve trap unit 2, the sleeve 4 and the cap 5 so that the flange part 41 and the flange part 28 are clamped between the upper end cover part 51 of the cap 5 and a casing upper edge (a step part 32). COPYRIGHT: (C)2004,JPO&NCIPI
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