PROBLEM TO BE SOLVED: To prevent a bypass valve from being unable to completely close a bypass passage owing to a foreign matter in a fluid.;SOLUTION: A trap casing comprising a main body 1 and a cover 2 includes: an intake 4; a valve chamber 3 communicating with the intake 4; an outlet passage 8 communicating with the valve chamber 3 through a valve port 9; and an outlet 5 communicating with the outlet passage 8. A float 11 which opens and closes the valve port 9 is arranged in the valve chamber 3 in a free state, and a bypass passage 12 which links the valve chamber 3 and the outlet passage 8 to each other is formed at the main body 1 and the cover 2; and a bypass valve 14 is provided which opens and closes the bypass passage 12, and a screen 6 which has filter holes for catching foreign matter in a fluid. All the fluid from the intake 4 reaches the bypass valve 14 after passing through filter holes of the screen 6.;COPYRIGHT: (C)2014,JPO&INPIT
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