| 摘要 |
A liquid sample injecting apparatus wherein a liquid sample is drawn by suction when a sample needle is moved to a lower position and the liquid sample drawn by suction is fed into a chromatographic column by using a carrier solvent when the sample needle is moved to an upper position. The apparatus is provided with seal members capable of providing a satisfactory seal to the outer peripheral surface of the sample needle by utilizing the high pressure of the carrier solvent when the carrier solvent is allowed to flow through the bore of the needle. When the sample needle is moved between the two positions, the high pressure of the carrier solvent applied to the outer peripheral surface of the sample needle is removed to reduce the frictional resistance offered to the outer peripheral surface of the sample needle, to thereby facilitate the movement of the sample needle.
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