BALL VALVE Russian patent published in 2002 - IPC

FIELD: manufacture of fittings; remotely-operated ball valves for operation in biologically toxic and radioactive media. SUBSTANCE: ball valve includes body with bonnet and inlet and outlet branch pipes, seat mounted in body, ball shut-off member located in suspension, stem with ball shut-off member hoist limiter, bellows seal of stem with upper bellows bush connected with body. Valve is provided with additional seat connected with suspension. Additional seat forms shut-off pairs with ball shut-off member and seat of body. Suspension is connected with bellows bush. EFFECT: enhanced operational reliability in modes of shut-off valve, check valve and valve group for displacement pump. 3 cl, 2 dwg