FIELD: mechanical engineering; gas processing industry. SUBSTANCE: proposed device includes shut-off member made in form of body with slot where axle with cams is articulated. Cams are spring-loaded in direction of rotation. Stops engageable with said cams are mounted on body of shut-off member. Cams have slots for receiving stops. Stops are adjustable. Slots in cams are intended for receiving wrench for rotation of cams. EFFECT: extended functional capabilities. 4 cl, 2 dwg
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