DEVICE FOR CUTTING OFF OUTLET Russian patent published in 1995 - IPC

FIELD: valving. SUBSTANCE: sealing-holding unit is constructed as a resilient sealing metallic pressing and extensible rings having interacting conical surfaces. The extensible ring is made up as metallic segments with the outer fine finning strengthened surface fastened with a rubber cord embedded in the segment body. Housings of plug are conical surfaces from faces and interact with conical surfaces of the ring unit. The housings are fixed against rotation one with respect to the other by way of grooves and pins. One housing has the ring groove and cylindrical bore with inner gear surface. The driving switch is provided with an additional hollow rod mounted for permitting reciprocation and rotation with respect to the main rod. The additional rod has additional handwheel, stop semi-rings entering ring groove, and gear cylinder engaging with gear surface of the housing. EFFECT: enhanced reliability. 4 dwg