Fluid conveyance device and method

摘要: PROBLEM TO BE SOLVED: To provide a fluid conveyance device capable of changing an introduction amount properly according to the kind, concentration and purpose sample required be conveyed. SOLUTION: This is equipped with passage for circulating fluid; valves positioned in middle passage, controlling flow. In device, comprises at least four passages, namely, first second third fourth which each one end three passages connected, are provided valve operated corresponding pressure difference generated between upstream side downstream when flows allows pass below prescribed value blocks flow over value, set valve. COPYRIGHT: (C)2006,JPO&NCIPI