Valve

Abstract

The invention relates to a valve, in particular a proportional valve, comprising a main piston (10) for actuating a main volumetric flow and a pilot piston (12) for actuating a pilot volumetric flow. The main piston (10) and the pilot piston (12) are guided in a valve housing (14) in a longitudinally movable manner, and the pilot piston (12) can be actuated by means of a magnetic device (16). The invention is characterized in that the position of the main piston (10) can be set by means of the pilot piston (12) in that a fluid pressure acting on the main piston (10) is signaled via a fluidic connection (18) into a pilot chamber (20) comprising the pilot piston (12) which keeps the main piston (10) in the closed position thereof, said closed position cutting off the main volumetric flow, in the event of an actuated magnetic device (16) in an actuated position and in that when the magnetic device is not actuated, the pilot piston (12) is in a starting position, in which the fluid pressure, decoupled from the pressure supply via the main piston (10), in the pilot chamber (20) decreases on the tank side (T) until the main piston (10) reaches an open position which controls the main volumetric flow.

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