Abstract: The invention relates to a pulp refining system for mechanically refining of lignocellulosic material, comprising a defibrator, a defibrator housing, in which the defibratoris arranged, a blow valve having an inlet and an outlet and being adapted for regulating a flow of pulp therethrough, and a discharge pipe having an inlet, which is connected to the outlet (12) of the blow valve, wherein a mounting pipe having an inlet, which is connected to the defibrator housing, is arranged between the defibrator housing and the blow valve, said mounting pipe having a length of at least about 0.2 meter.

Abstract: A discharge valve is disclosed which includes a valve housing which can be functionally connected to a process element having a pressurized interior space. The valve housing includes a flow channel having a longitudinal center axis (A) and is in working cooperation with a valve member. The flow channel is arranged to be in fluid communication with the pressurized interior space in the process element after the discharge valve has been connected to the process element. The valve member is displaceable between an open position and a closed position in a displacement direction (B) whereby the discharge valve can be opened and closed. The flow channel comprises a detachable inner lining having an envelope wall, and the detachable inner lining comprises an aperture extending through the envelope wall and through which the valve member is adapted to run when being displaced between the opened and closed positions.

Abstract: A discharge valve is disclosed which includes a valve housing which can be functionally connected to a process element having a pressurized interior space. The valve housing includes a flow channel having a longitudinal center axis (A) and is in working cooperation with a valve member. The flow channel is arranged to be in fluid communication with the pressurized interior space in the process element after the discharge valve has been connected to the process element. The valve member is displaceable between an open position and a closed position in a displacement direction (B) whereby the discharge valve can be opened and closed. The flow channel comprises a detachable inner lining having an envelope wall, and the detachable inner lining comprises an aperture extending through the envelope wall and through which the valve member is adapted to run when being displaced between the opened and closed positions.