Abstract: A valve mechanism having at least one movable valve member for sealing of a valve opening in a housing. Movements of the individual movable valve members are accomplished essentially parallelly to, and perpendicularly to, the seat surface of the valve during the opening and closing of the valve. In order to achieve high forces and low wear in the movement carried out with aid of a slot guide which guide serves to transmit forces during, and in the direction of, the opening and closing, the slot guide comprises slots which are formed in a drive plate, which slots cooperate with and overlap complementary slots in the movable valve members.

Abstract: A valve mechanism having at least one movable valve member for sealing of a valve opening in a housing. Movements of the individual movable valve members are accomplished essentially parallelly to, and perpendicularly to, the seat surface of the valve during the opening and closing of the valve. In order to achieve high forces and low wear in the movement carried out with aid of a slot guide which guide serves to transmit forces during, and in the direction of, the opening and closing, the slot guide comprises slots which are formed in a drive plate, which slots cooperate with and overlap complementary slots in the movable valve members.

Abstract: The present invention teaches a valve mechanism with constraint guide means. Both opening and closing of any valve working according to the principle of the invention is achieved by moving a central plate with respect to one or two plates for blocking flow through the valve. The constraint guide means according to preferred embodiments of the invention consist of grooves in the plates which cooperate with middle plate. As the grooves are inclined with respect to the direction of movement of the middle plate, a movement between these plates and the middle plate will cause opening or closing of the valve.

Abstract: A vacuum gate valve includes a spreading mechanism with an actuating member extending between first and second valve plates and movable transversely of the axis of the valve, and parallelepiped spreading members disposed between the first valve plate and the actuating member and between the second valve plate and the actuating member. In the open position of the valve, the spreading members include an acute angle with the direction in which the actuating member is moved for closing the valve. When the actuating member is moved in order to spread apart the valve plates and to close the valve, the spreading members pivot about intersecting lines of contact surfaces formed in the valve plates and in the actuating member. In the closed position of the valve, the spreading members extend perpendicularly to the direction of the movement of the actuating member.

Abstract: A sealing device for a high-vacuum closure, such as used in a high-vacuum valve, where the surfaces effecting the seal are formed of metal. In forming the seal, a sealing member extends between and into contact with a pair of laterally spaced sealing surfaces. The surfaces on the sealing member which contact the sealing surfaces are rounded and have a radius of curvature equal to half the dimension of the sealing member between the sealing surfaces when it first contacts the surfaces during the closing step. The sealing surfaces can be frustoconical or spherical. When the device is closed, sealing force presses the sealing member between the sealing surfaces so that a relative rolling action takes place. Only elastic deformation occurs when the seal is effected.

Abstract: A pipe valve assembly including a housing defining a flow aperture, a valve member for opening and closing the flow aperture, a spring biased valve seat ring for pressing the valve member to seal the aperture, a spring assembly urging the valve seat ring away from its sealing position and a fluid pressure chamber on one side of the spring assembly for receiving fluid pressure to actuate the valve seat ring into its sealing position. The spring assembly in formed with a smaller diameter annular spring member and a larger diameter annular spring member arranged coaxially relative to each other and relative to the valve seat ring with the valve seat ring being attached with an outer edge of the smaller diameter spring member and the inner edge of the larger diameter spring member. The spring assembly is supported in the housing at an inner edge of the smaller diameter spring member and at an outer edge of the larger diameter spring member.