Abstract: The invention relates to a pressure reducing valve essentially consisting ofa cylindera control piston movable in said cylinder, one end of said piston being situated in a control chamber and the other in a spring chamber housing a compression spring biasing the control piston in the opening direction;an oil supply chamber in the wall of said cylinder, said oil supply chamber having a connection for a supply pressure conduit and together with a control edge provided on the control piston constituting a variable restriction;an oil discharge conduit disposed downstream of said restriction for the discharge of oil under a reduced pressure;a load pressure pilot conduit connected to said spring chamber; anda feedback conduit connecting said control chamber to said oil discharge conduit. To compensate for fluid flow forces, the valve is characterized, according to this invention, in that said feedback conduit (11) is provided with a fixed restriction (R.sub.

Abstract: A control mechanism comprising a casing, an operating lever (1) projecting at the top from the casing and arranged to swivel omnidirectionally against a spring-produced resetting force, and at least two transducers arranged according to two orthogonal axes for producing signals being a measure for the magnitude of the swivelling angle and for the swivelling direction of the operating lever (1).The operating lever (1) is mounted near its lower end in a ball joint (2) received in the upper wall of the casing, with the free lower end of the lever (1) abutting on four spring elements (3,6,9,12) whose lines of action (X,Y) coincide two by two intersect each other at right angles. The spring elements (3,6,9,12) are connected at the lower end of the operating lever (1) to downwardly extending oscillating or wagging plates (5,8,11,14) whose ends (A,B), upon swivelling movement of lever (1), are displaced inwardly in the direction of the axis of the casing.