BRANCH PIPE SHUTOFF DEVICE Russian patent published in 2013 - IPC F16L55/18 

FIELD: machine building.

SUBSTANCE: proposed device comprises shouter and fitting mounted at pipeline. Fitting is composed of cylinder fragment supporting pipeline length and secured thereat by yokes and has center bore with pipe provided with branch pipe flange welded to bore edges. Said shutter is composed of a sheet coiled to shape mating that of pipeline having the bore identical to that of fitting and with width larger than branch pipe diameter and with length larger than twice the branch pipe diameter. Shutter is arranged at pipeline under said fitting to displace there along to allow alignment of fitting and shutter holes. Two seal gaskets are used to seal branch pipe, provided with holes identical to those in fitting and shutter. One of said gaskets is fitted between pipeline and shutter while another one between shutter and fitting. All said holes are aligned and feature diameter equal to that of branch pipe. Shutter may be made of steel or fluoroplastic or capronol. Fitting covers the pipeline in the range of 60° to 180°. Said shutter is driven by levers or screws, or hydraulic pistons.

EFFECT: higher reliability, simplified design.

4 cl, 2 dwg