| 摘要 |
PURPOSE: To prevent refuse clogging with a conventional drain device using a check valve with a ball and to prevent frequent abnormal stoppage of a machine. CONSTITUTION: A bellows chamber 31 is furnished below a tank T to be inserted into a vacuum circuit, a bellowfrum 32 to be vertically divide into two is provided in the bellows chamber, a discharge conduit pipe 34 to lead working water staying in the tank to an upper side space of the bellows chamber from above is furnished, a delivery conduit pipe 36 to deliver working water led to the upper side space outside is furnished, and an air conduit pipe 35 to selectively supply air to a lower side space of the bellows chamber is furnished. The bellowfrum 32 is loosened upward and closes an end part of the discharge conduit pipe when pressure air is supplied to the air conduit pipe, and the discharge conduit pipe and the livery conduit pipe are communicated to each other through the upper side space when the air conduit pipe is opened.
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