(19)

(11)

EP 0 423 169 A1

(12)

(43) Date of publication: 24.04.1991 Bulletin 1991/17 (21) Application number: 89907354.0 (22) Date of filing: 22.06.1989

(51) International Patent Classification (IPC):  F16K 1/ 16( . ) F24F 13/ 14( . ) (86) International application number: PCT/SE1989/000351 (87) International publication number: WO 1989/012791 (28.12.1989 Gazette 1989/30)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 23.06.1988 SE 19880002363 (71) Applicant: BERGDAHL, Knut S-865 32 Alnö (SE)	(72) Inventor: BERGDAHL, Knut S-865 32 Alnö (SE) (74) Representative: Bjerkén, Jarl Hakan  Bjerkéns Patentbyra KB P.O.Box 1274 S-801 37 Gävle S-801 37 Gävle (SE)