The assembly group (1) incorporates a valve cylinder (9) which has first (14) and second (15) radial apertures. The valve cylinder contains an axially movable valve piston (11), which has a recess (16) on a cover surface (17), which has a control edge (62) in the area of at least one of the two radial apertures of the valve cylinder . A measurement piston (19) is provided, fitted in an accommodation bore (40) of the valve piston. The valve piston has a set-back force applied to it by a spring (30).
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