Kvaerner Pulping Ab

Valmet Ab

Kamyr Aktiebolag

Metso Paper Sweden Ab

Allan Sven Jonsson

Robert Theiler

Axel Stig Lamangs

The pressure diffuser incorporates a screen that has a considerable weight that is moved by a connecting rod in a reciprocating manner between an upper and lower position. The connecting rod is maneuvered by a hydraulic cylinder for vertically moving the screen in a first slow stroke concurrent with pulp-flow and moving the screen in a second fast stroke countercurrent to pulp-flow. The pressure diffuser has an inlet defined therein at the bottom of the vessel but the hydraulic cylinder is located at the top of the vessel. This design enables an increased active pressure area in the hydraulic cylinder for the fast stroke of the screen. This reduces the power-rating needed for the hydraulic system.

Pressure diffuser with less power rating in hydraulic system

Digested softened non-defibrated chips are fed out from a bottom of a digester. The chips are fed out under an influence of a bottom scraper at the bottom of the digester and through an outlet tap at the bottom of the digester and onwards to an outlet line connected to the outlet tap. This takes place before the softened chips pass through a blow-valve arranged in the outlet line, across which blow-valve a pressure drop of at least 0.5 bar and at most 3-5 bar has been established. The chips are exposed to a displacement wash after the chips have passed the outlet tap. The displacement wash has been established in the flow of chips through the outlet line before the chips are defibrated by the pressure drop across the blow-valve.

Method and arrangement for wash after completed digestion in a continuous digester for the production of cellulose pulp

Hydraulic unit

Arrangement for a continuous diffuser for washing pulp

A means for receiving and subsequently emptying hydraulic fluid from a hydraulic system is described. It comprises a working cylinder (1) and a supply conduit (8) disposed between a pump and the working cylinder for supplying hydraulic fluid at high pressure within a predetermined interval. According to the invention the means also comprises a receiving cylinder (12) with a piston (19), which on one side defines a liquid space (22) for the receipt of hydraulic fluid from the working cylinder with an emptying pressure essentially lower than said high pressure, the piston (19) on the other side defines a chamber (21) containing gas at low pressure, and a high-pressure cylinder (13), which has a liquid space (28) and a plunger (30) movable therein, said liquid space (28) being connected to said supply conduit (8) to receive and return hydraulic fluid at high pressure therefrom and thereto, respectively. A piston rod (31) is disposed between the plunger (30) and the piston (19) to transmit movements from the plunger (30 ) to the piston (19) and reversed. Furthermore, the area of the piston (19) which is pressure-influenced by hydraulic fluid is essentially greater than the area of the plunger which is pressure-influenced by hydraulic fluid.

Means for receiving and subsequently emptying hydraulic fluid from a

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Kil, Sweden

Allan Sven Jonsson