| 摘要 |
PROBLEM TO BE SOLVED: To remove remaining foreigh matters when the tip of a branch pipe is opened so as to make easy cleaning of a complex check valve having check valves at at least two portions of a main body thereof, the two being connected by means of a pipe line by additionally providing a branch pipe on the way of the pipe line, and making the tip thereof closable. SOLUTION: In this valve, a plurality of check valve units 8, 16 open and close a valve through each of springs 13, 21 according to a pressure difference before and after each of discs 11, 19 to thereby prevent backflow of fluid. In this case, to a pipe line 1a between both the units 8, 16 a branch pipe 24 formed with a recessed part 14 at its end is additionally provided. Foreign matters mixed in fluid is made to remain in the part 25 to thereby prevent operation error of the valve caused by the foreing matters. Then the matters remaining in the part 25 is taken out from an opening of a main body after a cover plate 3 is opened or eliminated from an opening 26 formed at the part 25 after a plug 27 is removed. Accordingly, the purpose is attained.
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