Dosing device for analyzing apparatus
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United States of America Patent
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Mar 16, 1993
Grant Date -
N/A
app pub date -
Oct 16, 1990
filing date -
Oct 18, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a dosing device for analyzing apparatus, particulary for liquid chromatography, with a dosing loop, a change-over valve and a dosing needle (20) which can be introduced into a sample inlet (56) of the change-over valve (24), through which dosing needle (20) sample liquid can be dosed by means of a sample pump (66) into the sample inlet (56) and the dosing loop (22), the dosing needle (20) has a conical sealing surface (138) at its front end. The sample inlet (56) has a sample inlet passage (128) which forms a conical annular shoulder (136). The dosing needle (20) with its conical sealing surface (138) engages this annular shoulder (136) with a defined pre-stress.
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