(19)
(11) EP 0 280 234 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.01.1991 Bulletin 1991/02

(43) Date of publication A2:
31.08.1988 Bulletin 1988/35

(21) Application number: 88102569.6

(22) Date of filing: 22.02.1988
(51) International Patent Classification (IPC)4: D21C 9/00, B01F 7/00
// F16K5/06
(84) Designated Contracting States:
AT DE FR GB IT SE

(30) Priority: 23.02.1987 FI 870747

(60) Divisional application:
93114759.9 / 0578284

(71) Applicant: A. AHLSTROM CORPORATION
FIN-29600 Noormarkku (FI)

(72) Inventor:
  • Niskanen, Toivo
    SF-49 400 Hamina (FI)

(74) Representative: Görg, Klaus, Dipl.-Ing. et al
Hoffmann, Eitle & Partner Patent- und Rechtsanwälte Postfach 81 04 20
81904 München
81904 München (DE)


(56) References cited: : 
   
       


    (54) Method and apparatus for improving the treatment of fibre suspension and for the control of fibre suspension flow


    (57) The present invention relates to a method and an apparatus for optimizing the control and treatment of fibre suspension flow. The invention is mainly intended to be applied in connection with pumping of high consistency pulp in pulp and paper industry. In general, a control valve is provided on the discharge site of the pump in order to regulate the flow.
    Problems with high pressure loss across the control valve or clogging of the valve are eliminated or minimized by the method and apparatus (19) according to the invention, in which in close proximity to the flow side surface of the valve element (19) a fluidizing element (22) is arranged, which fluidizes the pulp to a liquid state so that the pulp can flow through the valve opening (16) and not clog it.







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