A high pressure valve for control of the injection of a sample into an analyzer system such as an amino acid analyzer with liquid column chromatography. The valve is designed in such a manner that no rinse solution that is used to cleanse the system after the injection of a particular sample will enter the liquid column. The valve operates in two positions and requires a minimum of movement between the two positions. In one position the valve allows for the injection of the sample into the liquid column. In the second position the valve allows for the entry of only a buffer solution into the liquid column and blocks the entry of any rinse solution that may flow through the system for cleansing after the injection of the sample. No residual rinse solution is allowed to remain within the valve prior to injection of either a sample or a buffer material into the liquid column.

Device for delivering measured quantities of gases or vapours

High pressure sample injector valve

A three-way double stopcock and associated tubing is disclosed with which to connect both a cardioplegia solution source and a pressure monitor for the solution selectively and alternatively to either an antegrade cardioplegia catheter or a retrograde cardioplegia catheter. The stopcock includes a hollow valve body with three solution infusion ports communicating to the interior thereof in a coplanar arrangement at a first longitudinal point on the valve body. Three cardioplegia pressure monitoring ports also communicate through the valve body to the interior thereof at a second longitudinal position distinct from the first. Mounted in the valve body is a cylindrical valve core selectively rotatable about the longitudinal axis thereof between a first position in which the cardioplegia solution source and the pressure monitor are coupled to the antegrade cannula and a second position in which the cardioplegia solution source and the pressure monitor are coupled to the retrograde catheter. Formed in the valve core are a set of valving passageways for communicating with selective of the infusion ports and a set of valving passageways for communicating with selective of the pressure monitoring ports.

Cardioplegia three-way double stopcock

Chromatographic gas analysis sample control system

Chromatographic sampling system

Fluid sampling valve

Automatic fraction collection apparatus

This invention relates to apparatus for separating gases, vapors or liquids, particularly light hydrocarbon gases or vapors such as ordinarily occur in natural gas, the apparatus hereinafter described being particularly intended for laboratory analysis, although it may also be utilized for...

Apparatus for separating gases and the like

The invention relates to a means for accurately measuring a volumetric sample of a fluid or of a granular material. Very often it is difficult to measure accurately a volumetric sample due to the fact that the excess of the material taken into the measuring instrument cannot be released so...

Device for delivering measured quantities of gases or vapours

Citations

High pressure sample injector valve

Cardioplegia three-way double stopcock

Chromatographic gas analysis sample control system

Chromatographic sampling system

Fluid sampling valve

References

Automatic fraction collection apparatus

Apparatus for separating gases and the like

Means for measuring volumetric samples

Gas analysis apparatus

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