US 4,378,280 AGranted

Fixed sleeve junction reference electrode

AssigneeGraphic Controls Corporation

InventorOscar R. Dufau

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Abstract

In an electrode of the type having a reservoir for containing a reference electrolyte solution and a liquid junction for effecting electrical communication between said reference electrolyte solution and a sample solution, and including a seat and plug valve assembly of the electrode in communication with the reservoir and a sample solution, an improvement characterized in that a resiliently stressed spring contained within the reservoir biases the plug axially into mating engagement with the valve seat, and in that, upon application of displacement pressure axially against the plug, the latter automatically twists, axially, to execute a partial turn so that a valve-closing face of the plug laps or wipes against the seat and concurrently moves from engagement with the valve seat to open the valve assembly for fluid flow and cleansing flushing therethrough.

Claims15

Dependent claims

In an electrode including a tubular housing defining a longitudinally extending bounding wall of a chamber for retaining a fluid therewithin,

first end closure means at a first end of said housing for restricting fluid flow from said chamber at said first end thereof,
second end closure means for controlling fluid flow from a second end of said chamber displaced axially from said first end thereof;
the improvement wherein said second end closure means comprises valve means including annular valve seat means and cooperating valve plug means for fluid-tight mating interengagement,
said improvement further comprising spring means biasing said plug means into fluid-retentive, fluid-flow-restricting engagement with said valve seat means,
said spring means being responsive to pressure applied to said plug means axially thereof and inwardly of said chamber forcibly to dislodge said valve plug means from said valve seat means thereby to open said valve means.

2 more elements

Dependencies are inferred from the claim text.