Pilot-control electromagnetic valve

A valve, comprising a main piston for actuating a main volumetric flow and a pilot piston for actuating a pilot volumetric flow;

• wherein
• the main piston and pilot piston are guided so as to be longitudinally movable in a valve housing;
• wherein
• the pilot piston can be actuated using a solenoid device;
• wherein
• the position of the main piston can be adjusted using the pilot piston in that a fluid pressure acting on the main piston is signaled into a pilot chamber with the pilot piston via a fluid connection, which pilot piston, when an actuated solenoid device is in an actuating position, holds the main piston in its closed position preventing the main volumetric flow;
• wherein
• when the solenoid device is actuated, the pilot piston moves into a position in which the fluid pressure, decoupled from the pressure supply via the main piston, in the pilot chamber decreases until the main piston reaches an open position which controls the main volumetric flow;
• and wherein
• a changeover valve is connected in the fluid-conducting connection between the main piston and the pilot chamber, which valve forwards the respectively higher pressure of two fluid ports in the valve housing, via which the main volumetric flow is guided, into the pilot chamber as the signal pressure.

A valve, comprising a main piston for actuating a main volumetric flow and a pilot piston for actuating a pilot volumetric flow;

• wherein
• the main piston and pilot piston are guided so as to be longitudinally movable in a valve housing;
• wherein
• the pilot piston can be actuated using a solenoid device;
• wherein
• the position of the main piston can be adjusted using the pilot piston in that a fluid pressure acting on the main piston is signaled into a pilot chamber with the pilot piston via a fluid connection, which pilot piston, when an actuated solenoid device is in an actuating position, holds the main piston in its closed position preventing the main volumetric flow;
• wherein
• when the solenoid device is actuated, the pilot piston moves into a position in which the fluid pressure, decoupled from the pressure supply via the main piston, in the pilot chamber decreases until the main piston reaches an open position which controls the main volumetric flow;
• and wherein
• as part of the fluid connection, a fluid chamber is created in the main piston, which chamber opens out via at least one connecting channel in the main piston into a further fluid chamber between the valve housing and the main piston, which chamber opens out via at least one further connecting channel in the valve housing with at least a partial overlap into the first recess in the pilot piston.

A valve, comprising a main piston for actuating a main volumetric flow and a pilot piston for actuating a pilot volumetric flow;

• wherein
• the main piston and pilot piston are guided so as to be longitudinally movable in a valve housing;
• wherein
• the pilot piston can be actuated using a solenoid device;
• wherein
• the position of the main piston can be adjusted using the pilot piston in that a fluid pressure acting on the main piston is signaled into a pilot chamber with the pilot piston via a fluid connection, which pilot piston, when an actuated solenoid device is in an actuating position, holds the main piston in its closed position preventing the main volumetric flow;
• wherein
• when the solenoid device is actuated, the pilot piston moves into a position in which the fluid pressure, decoupled from the pressure supply via the main piston, in the pilot chamber decreases until the main piston reaches an open position which controls the main volumetric flow;
• and wherein
• at least one further connecting channel is arranged in the pilot piston and in the valve housing, using which the second recess on the pilot piston can be connected to a tank.

A valve, comprising a main piston for actuating a main volumetric flow and a pilot piston for actuating a pilot volumetric flow;

• wherein
• the main piston and pilot piston are guided so as to be longitudinally movable in a valve housing;
• wherein
• the pilot piston can be actuated using a solenoid device;
• wherein
• the position of the main piston can be adjusted using the pilot piston in that a fluid pressure acting on the main piston is signaled into a pilot chamber with the pilot piston via a fluid connection, which pilot piston, when an actuated solenoid device is in an actuating position, holds the main piston in its closed position preventing the main volumetric flow;
• wherein
• when the solenoid device is actuated, the pilot piston moves into a position in which the fluid pressure, decoupled from the pressure supply via the main piston, in the pilot chamber decreases until the main piston reaches an open position which controls the main volumetric flow;
• and wherein
• a measuring rod passes through the pilot piston, which measuring rod, connected to the main piston, is part of a displacement measuring device for the main piston.