EP 0433434 A4 19911023 - IMPROVED DEWATERING SYSTEM WITH VORTEX VALVE
Title (en)
IMPROVED DEWATERING SYSTEM WITH VORTEX VALVE
Publication
Application
Priority
GB 8914438 A 19890623
Abstract (en)
[origin: WO9100388A1] A dewatering system is disclosed in papermaking machine for removing water from a web (P) such as a paper sheet made of pulp. The drainage system includes a vacuum or suction box (1), a separator (3) for separating solids and/or liquids from the drainage, and vortex valve (6) connecting the separator (3) to vacuum (5). Advantageously, the vortex valve (6) operates to maintain a substantially constant pressure at the separator outlet independently of the gas flow through the valve (6).
IPC 1-7
IPC 8 full level
D21F 1/48 (2006.01)
CPC (source: EP)
D21F 1/48 (2013.01)
Citation (search report)
- [A] GB 1147790 A 19690410 - DOUGLAS HERMAN NEWCOMB, et al
- [A] US 3024839 A 19620313 - BEACHLER EDWARD D
- See references of WO 9100388A1
Designated contracting state (EPC)
AT BE DE DK ES FR GB IT NL SE
DOCDB simple family (publication)
WO 9100388 A1 19910110; AU 6030890 A 19910117; BR 9006817 A 19910806; CA 2033210 A1 19901224; EP 0433434 A1 19910626; EP 0433434 A4 19911023; FI 905016 A0 19901012; GB 2233473 A 19910109; GB 8914438 D0 19890809; GB 9013894 D0 19900815; JP H04500395 A 19920123
DOCDB simple family (application)
US 9003546 W 19900621; AU 6030890 A 19900621; BR 9006817 A 19900621; CA 2033210 A 19900621; EP 90911100 A 19900621; FI 905016 A 19901012; GB 8914438 A 19890623; GB 9013894 A 19900621; JP 51012590 A 19900621