The actuators for proportional valves type F HM G + F HT P consist of a magnet body, and a tube. The solenoid body is fixed with a fastening nut on the tube and can be removed or replaced without opening the hydraulic circuit. The modular design makes it possible to combine the tube also with a solenoid body type F MM E, which has approvals according to ATEX and IECEx for operation in potentially explosive atmospheres.