Filtered for suction method and suction device in the dampening water circulation system of offset printing machine

摘要

PROBLEM TO BE SOLVED: To provide a suction method and a suction device that can suction a substance present in an upper layer region and a middle layer region of liquid, a substance floating on a liquid surface, and the like without causing a pump air lock. ;SOLUTION: A low level suction opening 30a and high level suction openings 36a and 39a are connected to a suction side of a single pump 10. The low level suction opening 30a is arranged in a position involving no or less risk of exposure beyond a liquid level 50, and the high level suction openings 36a and 39a are arranged in a position involving more risk of exposure beyond the liquid level 50 than the low level suction opening 30a or in a position capable of receiving in the air a liquid moving in the air. The low level suction opening 30a and the high level suction openings 36a and 39a suction liquid.;COPYRIGHT: (C)2003,JPO