GATE-VALVE CUT-OFF ASSEMBLY Russian patent published in 2000 - IPC

FIELD: manufacture of fittings. SUBSTANCE: cut-off assembly is designed to control and shut off working medium passing through pipelines of industrial and municipal networks. Gate- valve cut-off assembly has unit of disc shutters. Shutters contact one another by face precision surfaces. Disc shutters are provided with through windows. Side shutters are stationary. Middle shutter is mounted for turning relative to other stationary shutters. Supporting members are positioned near stationary shutters on side of their vacant face surfaces. Supporting members are made as discs with through windows aligned with windows of stationary shutters. Thickness of supporting members increases gradually from periphery to center. EFFECT: improved operational characteristics. 5 cl, 6 dwg