FIELD: gas industry; shutting-off pipe cavity under pressure in conducting repair jobs on acting gas mains. SUBSTANCE: device has a body with plug movably located inside it; plug is provided with sealing blank; device is also provided with drive for motion of plug. Sealing blank is made in the form of metal expanding sectors: two external sectors and two internal sectors; each sector is provided with elastic sealing member made from polyurethane or fluoroplastic. Drive for translational motion of plug is made in the form of three gear wheels mounted on body and two threaded pairs, type screw-nut mounted on butt end of plug for engagement with gear wheels; one end of each screw is secured to one of driven gear wheels. Under action of pressure of working medium fed to plug cavity through rubber hose outer and inner shift to extreme position forming closed loop of sealing members fitted over external diameter of these sectors and butt end of plug, thus providing for reliable sealing of pipe cavity. EFFECT: enhanced operational reliability; simplified construction; low cost of manufacture. 2 cl, 6 dwg
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