Seal

Details Seal Seal

F - Mech Eng,Light,Heat,Weapons

16

J

277/38

F16J 15/46 (2006.01) F16J 15/16 (2006.01) F16J 15/32 (2006.01) F16J 15/34 (2006.01)

Patent

CA 1141408

ABSTRACT A shaft seal assembly with open mode capabilities has markedly simplified construction. A shiftable ring on the shaft is axially biased against a complemental, stationary shoulder circumscribing the shaft to form a pair of radially spaced annular seals concentric to the shaft. A fluid pressure port on the shoulder intermediate the seals permits selective shifting of the ring away from the shoulder to open the annular seals and place the seal assembly in the open mode wherein the shaft may be rotated without wearing the seals. In preferred forms, the seal assembly is provided with a vent between it and the shaft bearing to relieve pressure against the bearing when the seal assembly is shifted to the open mode, and also to serve as a leak indicator.

374829

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