(19)

(11)

EP 4 179 216 A1

(12)

(43) Date of publication: 17.05.2023 Bulletin 2023/20 (21) Application number: 21837289.4 (22) Date of filing: 07.07.2021

(51) International Patent Classification (IPC):  F15B 3/00(2006.01) F15B 21/14(2006.01) (52) Cooperative Patent Classification (CPC): F15B 21/14; F15B 3/00; F15B 2211/20538; F15B 2211/20561; F15B 2211/20569; F15B 2211/20576; F15B 2211/214; F15B 2211/25; F15B 2211/50518; F15B 2211/515; F15B 2211/88; F15B 2211/20546; F15B 11/0426; F15B 2211/20592; F15B 2211/40592; F15B 2211/30575; F15B 2211/327 (86) International application number: PCT/FI2021/050530 (87) International publication number: WO 2022/008803 (13.01.2022 Gazette 2022/02)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 10.07.2020 FI 20205744 (71) Applicant: Norrhydro Oy 96300 Rovaniemi (FI)	(72) Inventor: STAMBRO, Peter 96100 Rovaniemi (FI) (74) Representative: Kolster Oy Ab  Salmisaarenaukio 1 P.O. Box 204 00181 Helsinki 00181 Helsinki (FI)