Measuring and testing – Measuring vessel
Patent
1976-04-13
1978-01-17
Swisher, S. Clement
Measuring and testing
Measuring vessel
G01N 110
Patent
active
040685284
ABSTRACT:
Several embodiments of a two-position rotary valve for injecting a liquid sample into a stream of solvent, flowing through a liquid chromatographic column, are disclosed. The valve is switchable between a Load position and an Inject position. The valve includes a needle cavity axially extending along the valve's rotor axis of rotation. The needle cavity is designed to accommodate a syringe needle from which a sample is loaded into one end of a sample loop which is externally connected to the valve, while the opposite end of the loop is vented to the atmosphere, when the valve is in the Load position. This facilitates the loading of the sample into the sample loop through the needle cavity at atmospheric pressure with a conventional syringe needle. In the Inject position solvent is made to flow through the sample loop in order to eject the sample from the loop and inject it onto the column. Sample ejection from the loop may take place from the same loop end through which the sample was loaded into the loop or from the loop's opposite end.
REFERENCES:
patent: 3346486 (1967-10-01), Winter
patent: 3411525 (1968-11-01), Auger
patent: 3827303 (1974-08-01), Shiina
patent: 3961534 (1976-06-01), Gundelfinger
patent: 4022065 (1977-05-01), Ramin
Rheodyne Incorporated
Swisher S. Clement
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