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Disc Gap Control System enhance pulp refiner operation
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Application Requirement
The control system must maintain a constant gap between refiner grinding plates regardless of load variations. Gap distance also must be maintained during planned or inadvertent power shutdowns.
Customer Concern
Customer expectations include feedback control of gap distance, easy tuning, no collisions between the plates, and communication with a plantwide PLC or DCS system.
Vishay Solution
Vishay Nobel Disc Gap Control Systems have been installed in hundreds of refiners to provide optimal plate gap control that results in minimal disc wear. Disc Gap Control Systems fit most new disc refiners and facilitate easy retrofit of existing units.
Two installation solutions are available:
The basic system uses a manual, stepper-motor-controlled, hydraulic servo valve with mechanical feedback from the grinding plate and a transducer that measures the disc position. System electronics monitor and control disc gap and wear. The gap can be set either manually or remotely. Plate position is maintained regardless of load variations or loss of power.
Vishay Nobel also offers a more advanced electro-hydraulic system with a digital servo position controller, a servo valve, and feedback from position transducers that maintain gap width to minimize disc wear. A pressure loop control also can be included.
Disc Gap Control Systems provide two communication options: analog output or a digital Fieldbus protocol interface.
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