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Abstract

An electromagnetically actuated piston slide valve (1) with proportional characteristic comprises an axially movable piston (5) for closing radial passage openings (7). So as to change, with a cross-sectional area of the fluid passage openings (7) given by the magnetic drive, a parabolic course of the pressure loss at an increasing flow rate into a largely linear to degressive course, there is provided a pressure-sensing bore (9), which connects the fluid entrance side, at which pressure P.sub.1 is present, with the fluid exit side, at which pressure P.sub.2 is present. In the pressure-sensing bore (9) is axially displaceably disposed a pressure-sensing pin (10) and pushes, when pressure P.sub.1 is greater than pressure P.sub.2, the slide piston (5) into its open position. Thereby the free cross-sectional area of the fluid passage openings (7) increases, and the pressure loss .DELTA.P=P.sub.1-P.sub.2 decreases correspondingly. By a suitable design of the ratio of the magnetic force applied by the magnetic drive and the pressure force applied by the pressure-sensing pin (10) the hydraulic characteristic curve (pressure loss against volume flow) can be adjusted.

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