its opening and closing direction that is to say radially to the cylinder 3 and is oriented on the valve seat 19 during the closing of the outlet valve 14 any offset of the passage 13 having the valve seat 19 with respect to the cylinder head 16 forming the valve casing is compensated a valve closing spring 24 which is designed as a helical compression spring in the illustrated embodiment of the disclosure loads the damper body 23 and via this the shut off body 17 against the valve seat 19 the valve closing spring 24 is supported on a base of the blind hole 15 in the cylinder head 16 when the pump piston 2 displaces brake fluid out of the cylinder 3 during a stroke in the direction of the bottom 12 of the cylinder 3 the shut off body 17 is lifted off from the valve seat 19 and the outlet valve 14 is thereby opened the damper body 23 moves in accompaniment with the shut off body 17 the shut off body 17 being movable with respect to the damper body 23 during the opening of the outlet valve 14 the damper body 23 is pressed into the blind hole 15 in the cylinder head 16 and displaces brake fluid out of the blind hole 15 through an annular gap 25 surrounding the damper body 23 in the blind hole 15 the displacement of brake fluid out of the blind hole 15 has the effect of damping the opening movement of the outlet.