Patent ID: 6752171
Filing Date: 2004-06-22
Classification: F15B,F16K,G01D,Y10T

Abstract:
A drive comprising a drive force unit, a yoke for the fixed connection to a valve, a drive spindle for the transmission of the movement of the drive force unit onto the valve and a sensor unit for acquiring the valve position, the sensor unit being integrated in the drive spindle comprising a magnetic track having a periodic structure extending along the moving direction of the drive spindle, a pair of sensors connected to the yoke of the drive close to the magnetic track and being offset relative to one another along the moving direction, said sensors being suitable for the acquisition of changing magnetic field lines and at least one magnet in the region of the magnetic track and sensors, said magnet having magnetic field lines penetrating both the magnetic track and the sensors, the drive being coupled to the control valve, the magnet being a permanent magnet, the sensors being supplied with electrical auxiliary energy via an electrical auxiliary energy source, the sensors being connected to a unit for monitoring the electrical auxiliary energy of the source, an energy store for supplying the sensors with electrical energy, said energy store being connected to the sensors at least when an outage of the electrical auxiliary energy occurs so that the energy store makes it possible to continue the position measurement of the valve position, even during outage of the electrical auxiliary energy, for at least a predetermined time.