METHOD FOR BALL VALVE WITH TOP SOCKET REPAIRING WITHOUT DISCONNECTING FROM THE MAINLINE Russian patent published in 2018 - IPC F16K43/00 F16K5/14 F16K5/20 

FIELD: machine building.

SUBSTANCE: invention relates to general machine building, namely, to valves with rotary stoppers and sealing surfaces spreading devices, mainly to valve parts temporarily replacing methods and devices without removing the valve body from the pipeline. Disassembly of the valve: the spindle is rotated by an angle of 135° in the direction of valve closing, and the expansion of the saddles is carried out with both saddles expansion device in the form of two shaped cams, rigidly connected to a ball stopper and installed above and below relative to its sphere. Cams move the seats until they come into contact with the bores on the body end face. Separating the cover, spindle, o-ring and stuffing box, fixing the seats with the fixing means, made for each seat in the form of two L-shaped clips placed on pins of the body. Spindle is turned back by an angle of 135° into the "open" position, the ball plug is removed from the body. Next, removing the L-shaped clips of the seats fixing means and seats with sealing rings and pressure springs, replacing the seats and the ball plug. Assembly: installing seats with sealing rings and pressure springs by means of said moving the seats mounting means until its contact with the bore end face with simultaneous compression of the pressure springs. Each seat is fixed with a L-shaped clip. After both seats installation into the body, installing the ball plug, releasing the L-shaped clips. After this, removing the L-shaped clips from the body and installing a sealing ring, cover, spindle, stuffing box and cross-beam.

EFFECT: methods and devices without removing the valve body from the pipeline are proposed.

4 cl, 7 dwg