The Dow Chemical Company

Dale J Backlund

Reid S Willis

David S Brink

David L Simeroth

A new use for a process gas chromatography liquid injection valve of the Bendix type, i.e., a valve having a distal heated vaporization chamber, a central sample chamber, a valve stem bore intersecting both chambers, a radially grooved valve stem positioned within the valve stem bore and an air actuator for moving the valve stem back and forth in the valve stem bore. The heated vaporization chamber is removed and is not used. Instead, a carrier gas is now flowed through the remaining chamber of the valve. The valve is mounted on a process vessel or a process conduit (and not on a gas chromatograph) so that the valve stem of the valve now can be extended from the valve and into the process liquid in the process vessel or conduit. The groove of the valve stem fills with sample and then the valve stem is retracted into the valve so that the groove is positioned within the remaining chamber, i.e., what was used as a sample chamber is now is used as a vaporization chamber. The liquid in the groove can then evaporate into the carrier gas and be carried to a gas chromatograph or other analyzer.

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Concord, CA, United States of America

Dale J Backlund