(19)

(11)

EP 3 976 973 A1

(12)

(43) Date of publication: 06.04.2022 Bulletin 2022/14 (21) Application number: 20730223.3 (22) Date of filing: 29.05.2020

(51) International Patent Classification (IPC):  F04D 19/04(2006.01) F04B 37/02(2006.01) (52) Cooperative Patent Classification (CPC): F04D 19/042; F04D 19/046; F04B 37/02 (86) International application number: PCT/EP2020/064964 (87) International publication number: WO 2020/239975 (03.12.2020 Gazette 2020/49)

(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: 29.05.2019 GB 201907557 20.02.2020 GB 202002394 (71) Applicant: Edwards Limited Burgess Hill, Sussex RH15 9TW (GB)	(72) Inventors: CHEW, Andrew David Burgess Hill Sussex RH15 9TW (GB) LAMB, Peter Charles Burgess Hill Sussex RH15 9TW (GB) (74) Representative: Totman, Clare Elizabeth  Edwards Limited Innovation Drive Burgess Hill, West Sussex RH15 9TW Burgess Hill, West Sussex RH15 9TW (GB)