METHOD OF ELIMINATION OF GAS LEAKS PAST FLANGED CONNECTIONS OF ROTARY VALVES IN GAS CONDUITS WITHOUT STOPPAGE OF GAS PUMPING ALONG CONDUIT Russian patent published in 2003 - IPC

FIELD: civil engineering. SUBSTANCE: invention can be used in servicing and repair of gas conduits. Blind dummy hole is made in flange of rotary valve in which additional rotary valve is secured through which dummy hole is extended to reach interflange space or pin cup and then sealing compound is pressure-fed into interflange space and pin cups, said pressure exceeding gas pressure in gas conduit. Then additional rotary valve is removed, and dummy hole is closed. To preclude getting out of sealing compound in process of pressure feeding, flange, pin cups and nuts from outer side of rotary valve are treated with catalyst. EFFECT: improved reliability of flange joints of rotary valves. 2 cl, 7 dwg