Valve device

A valve device, comprising at least one valve piston arranged in a valve housing in a longitudinally displaceable manner, which valve piston moves using a drive in conjunction with an assigned drive train, interconnects individual fluid ports present in the valve housing in a fluid-conveying manner or separates them from one another;

• wherein
• a sensor monitors the respective positions of the drive train and thus the respective positions of the valve piston in the valve housing;
• the drive is an electric motor;
• the drive train comprises at least one motor shaft, which is drivable by the electric motor;
• one end of the motor shaft opens into a gearbox, which using a gear shaft actuates a drive pinion, which meshes with a rack, which interacts with the valve piston;
• wherein
• the sensor comprises a first sensor that monitors the motor shaft and a second sensor monitoring the gear shaft;
• and
• a permanent magnet is mounted directly to the gear shaft, which magnet actuates the second sensor during rotation of the gear shaft.