BELLOWS SHUT-OFF VALVE Russian patent published in 1998 - IPC

FIELD: manufacture of fittings. SUBSTANCE: bellows shut-off valve includes body, shut-off member with taper surface which is mating relative to surface of seat, rod of shut-off member which is engageable with clip unit fitted on mounting surface of body. Rod is sealed by means of bellows and stuffing box. Mounting surface of body is made in form of circular projection and mating surface of clip is made in form of circular groove of V-shaped profile. Above- mentioned mounting surfaces are provided with microrelief in form of alternating flat circular and cylindrical surfaces. Besides that, surface of rod which is in contact with stuffing box is provided with microrelief in form of replicated projections and grooves oriented in direction of motion of rod. EFFECT: enhanced reliability. 6 dwg