Abstract: A controlled sliding valve comprises a valve housing with a cylindrical bore, in which a slide controlling a hydraulic flow reciprocates by an adjusting force, the sealing surfaces between the slide and bore form a sealing gap converging in the flow direction, and the amount of flow is controlled between a throttling edge and longitudinal control grooves (7, 8;44) in the slide with variable cross-sectional area in the direction of movement of the slide, and a centering spring retains the slide in closing position. In order to obtain low adjusting forces, to control the volume so as to be substantially constant and independent of the pressure drop over the valve, and to maintain low leakage past the slide, the valve housing includes a central chamber (6) provided with a port (3), and on both sides of the central chamber two control chambers (9, 10) with ports and each with a sealing gap (11, 12) spaced from each other.

Abstract: In a method for coating a surface with a layer the surface is first subjected to vacuum in a vacuum zone (V) sealed against the surface, whereupon liquid for forming the layer is supplied to the surface in a sealed pressure zone (P) following the vacuum zone. The supplied liquid is then spread out in a controlled manner, preferably by the sealing (13) terminating the pressure zone. FIG. 1.

Abstract: The sealing device is intended for sealing in one direction between the cooperating surface of a cylindric cavity and shell surface of a cylindric cavity and shell surface of a spindle (3) movable therein. One or the other surface is provided with an annular groove (9), in which a sealing ring (8) is located, which is slightly movable in axial and radial direction and intended to minimize fluidum leakage in axial direction between the cooperating surfaces. The ring (8) has small cross-sectional dimensions in relations to the spindle (3) and enclosing cavity. The ring is slim but is of rigid material. The sealing surface (12) of the ring is slightly conic. The ring abuts on the radial inner surface (11) of the groove along a supporting surface, which is annular and has substantially smaller height than the cross-sectional height of the ring and is located adjacent the sealing surface. One or more grooves are located in peripheral direction about the inner surface of the ring.