US 4,580,452 AGranted

Device for taking a liquid from a conduit which contains the liquid or for injecting a liquid into the conduit

OwnerGuy Massoninventor

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Abstract

A valve is mounted on a conduit from which it is desired to take a sample of the liquid which flows along the conduit. The body of the valve includes a through passage within which a needle valve member is removably inserted to close the valve. The body is provided, opposite said passage, with a collar in which is engaged the end of a rigid tube with a sampling vessel provided with a needle valve. Thus, it is possible to withdraw samples of the liquid into the vessel without any leakage of liquid and even without any emanation therefrom occuring, which is of the highest importance in the case of toxic or noxious liquids. Moreover, the device does not produce any dead volume of liquid which it would be necessary to purge before each taking or sampling of liquid from the conduit.

Claims10

Dependent claims

A device for taking a sample of a liquid flowing through a conduit or for injecting a liquid into the conduit, comprising:

A. a valve body including a wall forming a portion of said conduit, said wall having a sample passage therethrough including an opening through an outer surface of said wall;
and
B. a needle member operable from outside the valve body and removably passing through said passage to form a needle valve therewith, said needle member having one end thereof passing through said passage and located in flush engagement with said outer surface of said wall in a closed position of said needle valve so that said member completely occupies said opening in order to eliminate any dead volume within said passage isolated from said flow through said conduit in said closed position, which dead volume would otherwise expose a portion of the wall surrounding said passage to adhesion of static sample liquid in said closed position and would otherwise require purging of said passage between liquid samplings.

Dependencies are inferred from the claim text.