Abstract: The invention relates to a screw-in valve comprising a screw-in component, a sleeve with at least two connection openings to which a pressure load can be alternately applied, and a valve piston held for axial displacement in the sleeve for opening and closing a flow connection between the connection openings. In order to further develop the screw-in valve so as to reduce the risk of impairing movement of the valve piston on account of misalignment of the screw-in component, it is proposed, in accordance with the invention, that the sleeve be mounted so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component relative to the screw-in component.

Abstract: The invention relates to a screw-in valve comprising a screw-in component, a sleeve with at least two connection openings to which a pressure load can be alternately applied, and a valve piston held for axial displacement in the sleeve for opening and closing a flow connection between the connection openings. In order to further develop the screw-in valve so as to reduce the risk of impairing movement of the valve piston on account of misalignment of the screw-in component, it is proposed, in accordance with the invention, that the sleeve be mounted so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component relative to the screw-in component.

Abstract: A device for opening a scissor-type jack with paired cross-bars, the device having a chamber of variable volume connected to fluid inlet and outlet provided by end plates to which two cover plates are fixed. The first cover plate has two flanges disposed on the opposite sides of the cover plate and extending to a second cover plate and are connected for rotation of the first cover plate to the cross-bars. The second cover plate has two flanges. The distance between the two flanges is smaller than the distance between the flanges of the first cover plate and the flanges of the first cover plate are coaxially connected for rotation to the inside surface of the outer cross-bars, while the flanges of the second cover plate are coaxially connected for rotation to the inside surface of the inside cross-bars. In this way the axis of the rotary connection of the two cover plates to the cross-bars, intersects a line joining the centroids of the two end plates.