(19)

(11)

EP 4 739 818 A1

(12)

(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 24772612.8 (22) Date of filing: 16.09.2024

(51) International Patent Classification (IPC):  C25B 1/04(2021.01) C25B 9/73(2021.01) F04D 1/00(2006.01) F04F 13/00(2009.01) C25B 9/05(2021.01) C25B 15/08(2006.01) F04F 1/18(2006.01) F28D 9/00(2006.01) (52) Cooperative Patent Classification (CPC): C25B 1/04; C25B 15/087; F04D 1/00; F04F 13/00; C25B 9/05; F04F 1/18; C25B 15/083; C25B 9/73; F04F 5/24; F04D 13/04 (86) International application number: PCT/EP2024/075767 (87) International publication number: WO 2025/061610 (27.03.2025 Gazette 2025/13)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 22.09.2023 DK PA202370484 (71) Applicant: Grundfos Holding A/S 8850 Bjerringbro (DK)	(72) Inventors: TÆKKER MADSEN, Henrik 8850 Bjerringbro (DK) ØRSTED, Peter 8850 Bjerringbro (DK) ELKJÆR LAUSTSEN, Michael 8850 Bjerringbro (DK) ARORA, Arun 8850 Bjerringbro (DK) (74) Representative: Rupp, Christian  Mitscherlich PartmbB Karlstraße 7 80333 München 80333 München (DE)