| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a fixture of a valve plug and a valve seat in a check valve disposed in a liquid feeding apparatus. SOLUTION: Channel switching valves are arranged so as to communicate with suction openings (12, 22)/discharge openings (12, 23) of plunger pumps, thereby enabling a channel for eliminating the valve plug/valve seat fixture and a channel for usual liquid feeding to be switched. The suction opening of a plunger pump 10 in its bad condition for the liquid feeding communicates with the discharge opening 12 of a plunger pump 20. The liquid fed by the plunger pump 20 reaches the suction opening 12 of the plunger pump 10 through a channel switching valve 25, a bypass channel 27 and a channel switching valve 14, and eliminates salts and the like fixing the valve plug to the valve seat in the suction opening 12 by dissolving them. COPYRIGHT: (C)2008,JPO&INPIT
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