SHUT-OFF ADJUSTING VALVE Russian patent published in 1994 - IPC

FIELD: manufacture of fittings. SUBSTANCE: pinching mechanism consists of two levers 5 mounted on axles 6. One arm of lever 5 is engageable with hose 4 and other arm is provided with roller 8 mounted on axle 7 and engageable with tappet 9 linked with rod 10 of drive. Tappet 9 is conical in shape and is located between rollers 8 whose surfaces are provided with chute 11 with curvature radius equal to half diameter of section of cone engageable with surface of chutes in position of complete closing. Suggested combination of form of rollers and tappet excludes shifting of lever over pinching surface, thus enhancing reliability of valve. EFFECT: enhanced reliability. 4 dwg