An electromagnetic valve (4) for a fluid, comprises a body (18) with a fluid inlet (22), a fluid outlet (24); a shut-off device comprising a main seat (20) in the passage; a main closure element (12) mobile in longitudinal direction, with a front face (12.1) cooperating with the main seat (20) and with a channel (12.3) fluidly interconnecting the front face (12.1) and an opposed rear face; a pilot closure element (14) cooperating with a pilot seat (26) on the main closure element (12); and a piston (44) at the centre of the front face (12.1), configured for cooperating with the main seat (20) so as to form with the front face (12.1) in contact with the main seat (20) a cavity (48) fluidly connected to the channel (12.3), a building up of an inlet fluid pressure in said cavity (48) biasing the main closure element (12) away from the main seat (20).