Valve or the like for hydraulic or pneumatic systems

摘要

A needle valve for hydraulic or pneumatic systems having at least one flow passage, which is arranged between an inlet and an outlet for the hydraulic flow medium and opens close to the outer surface of a valve needle, there being, opposite the outer surface, an inner surface movable relative to it, a sleeve accommodating the valve needle or a corresponding element, is, on the one hand, to permit a very low flow rate and, on the other hand, also to be easily adjustable under pressure. This is achieved by the fact that the outer surface (88) of the valve needle (76) has at least one formed-in cam section (40), which encloses an angle (w1) of inclination with a radial plane through the valve needle, the radial plane preferably being defined by an annular edge (90) in the outer surface forming an annular surface (88). <IMAGE>