Flag-type pig-sig

Details Flag-type pig-sig Flag-type pig-sig

G - Physics

01

F

116/68

G01F 1/00 (2006.01) F16L 55/48 (2006.01)

Patent

CA 1235024

ABSTRACT OF THE DISCLOSURE An apparatus for mounting on a pipeline to signal the passage of a pipeline pig through the pipeline. A tubular body is mounted on the pipeline. A flag arm is hinged to the body member and pivotal between a set and an act- uated position. A plunger rod is slideably supported on the body and engages the flag arm when both are in the set position. A connecting linkage displaces the plunger rod upon the rotation of a shaft within the body and an engagement member pivotal extends from the lower end of the body into the pipeline for displacement as a pig moves through the pipeline. The engagement members serves to rotate the shaft when it is displaced to thereby withdraw the plunger rod to permit the flag arm to move to the actuated position, indicating the passage of the pipeline pig.

460940

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