Valve device for a hydraulic circuit and oil pump control apparatus

A valve device for a hydraulic circuit, the valve device comprising:

• an actuator unit comprising an electromagnetic circuit comprising,
• an armature configured to be translationally movable,
• a core,
• a coil carrier,
• a coil configured to be energizable and which is arranged on the coil carrier, and
• a flux guiding device;
• a valve unit comprising,
• a unit formed by a valve tappet and the armature,
• an outlet port,
• an inlet port arranged so as to be spaced further from the actuator unit than the outlet port, and
• a control port arranged between the inlet port and the outlet port;
• a first control body configured to cooperate with a first valve seat formed between the control port and the outlet port;
• a second control body configured to cooperate with a second valve seat formed between the control port and the inlet port;
• a spring element;
• an actuator chamber formed between the core and the armature;
• and
• a longitudinal through bore configured to extend axially, the longitudinal through bore being arranged in the unit to extend from the inlet port into the actuator chamber,
• wherein,
• the armature and the valve tappet are loaded in an opening direction of the inlet port by the spring element and are loadable in an opening direction of the outlet port by energizing the electromagnetic circuit,
• the first control body and the second control body are arranged at the unit in which the longitudinal through bore is formed,
• the second control body comprises a force application surface on which a hydraulic pressure at the inlet port acts,
• the armature comprises a force application surface on which a hydraulic pressure in the actuator chamber acts,
• the force application surface of the second control body is always equal to the force application surface of the armature so that an equilibrium of forces is achieved on each side of the unit formed by the valve tappet and the armature in any state of the valve device.