Double disc refiner

The Double Disc Refiner is a refiner of double-disc cantilever design with hydraulic positioning of the rotor disc.

A refining zone between two flat discs rotating in opposite directions make the DD concept unique. The hydraulic system, operated by a guide valve, controls the disc clearance on the refining zone. The segments are mounted on segment holders. The disc clearance is kept constant during various operating conditions and loads by means of a hydraulic control system. The disc clearance is measured by a TDC (True Disc Clearance).