| 摘要 |
PURPOSE:To improve an accuracy of mixing ratio at the mixing of plural kinds of liquids by plunger pumps, by permitting control valves, making an open-and- close actions respectively in regular sequence, to perform said valve actions twice or more times at one suction stroke of said plungers. CONSTITUTION:When solvents A and B are sucked and mixed by two plunger pumps 5 and 6 through respective control valves 2 and 3, a series of actions, that the control valves 2 and 3 make open-and-close actions respectively once in regular sequence at one suction stroke of respective plungers, are made to perform two or more cycles per one saie stroke. Thus the variability of mixed ratios caused by variations etc. of the operating characteristics of plunger pumps is prevented and balanced, and the accuracy of mixing ratio is improved. |
