| Vishay Nobel Disc Gap Control (DGC) Systems are installed in pulp and paper mills worldwide. These systems were designed to fit most new disc refiners and enable easy retrofit of old ones. Vishay Nobel offers two standard solutions: The basic system incorporates a manual- or stepper-motor-controlled hydraulic servo valve, with mechanical feedback from the grinding plate and a transducer for measuring the disc position. An electronic unit controls and monitors disc gap and wear. The gap can be set either manually or remotely. The position of the discs is maintained independent of load variations or loss of power. Vishay Nobel also offers a more advanced electro hydraulic system with a digital servo position controller, servo valve, and feedback from position transducers for gap width and disc wear. A pressure loop control can also be included. Interface to the DCS is made with either analog or binary signals, and digitally transmitted via serial or fieldbus communication. |