Abstract: The invention provides a double disc gate valve where the discs are movable in a casing by a disc manipulation structure which can change an orientation of at least one of the valve discs relative to the center plane away from an initial orientation by movement of an outer disc carrier relative to an inner disc carrier. The relative movement between the disc carriers is initiated automatically during opening and closing of the valve. The change in orientation facilitates sealing between the discs and valve seats by a gradually established contact between the discs and the seats and the required opening and closing force may therefore be reduced.

Abstract: The invention provides a double disc gate valve where the discs are movable in a casing by a disc manipulation structure which can change an orientation of at least one of the valve discs relative to the centre plane away from an initial orientation by movement of an outer disc carrier relative to an inner disc carrier. The relative movement between the disc carriers is initiated automatically during opening and closing of the valve. The change in orientation facilitates sealing between the discs and valve seats by a gradually established contact between the discs and the seats and the required opening and closing force may therefore be reduced.

Abstract: The invention relates to a gate valve with a housing, having an inlet and an outlet, between which a flow area is arranged, with a sealing insert in the flow area and a sliding element cooperating with a contact area of the sealing insert in the closed state. In a gate valve of this kind, the function must be improved. For this purpose, the sealing insert has a rigid body, which is permanently connected with at least one additional area with a lower rigidity.