The invention relates to an electromagnetically actuated suction valve for a high-pressure pump of a fuel injection system, in particular a common rail injection system, comprising a magnetic subassembly (1) that includes an annular electromagnetic coil (2) for acting on an armature (3) which is accommodated in a cavity (4) of a valve body (5) so as to be liftable and to which the spring force of an armature spring (8) is applied in the direction of a liftable valve-closing element (7) cooperating with a valve seat; a pole core (10) lies across from the armature (3) at an operational air gap (9). The invention is characterized in that the pole core (10) penetrates a pole disk (11) and is decoupled from the pole disk (11) by a circumferential radial gap (12). The invention further relates to a high-pressure pump comprising a suction valve of said type.