(19)

(11)

EP 3 867 528 A1

(12)

(43) Date of publication: 25.08.2021 Bulletin 2021/34 (21) Application number: 19787367.2 (22) Date of filing: 03.10.2019

(51) International Patent Classification (IPC):  F04B 37/02(2006.01) F04B 37/14(2006.01) F04B 19/00(2006.01) F04B 37/08(2006.01) F04B 41/06(2006.01) (86) International application number: PCT/GB2019/052785 (87) International publication number: WO 2020/079396 (23.04.2020 Gazette 2020/17)

(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: 18.10.2018 GB 201816978 (71) Applicant: Edwards Limited Burgess Hill, Sussex RH15 9TW (GB)	(72) Inventor: CHEW, Andrew David Burgess Hill Sussex RH15 9TW (GB) (74) Representative: Totman, Clare Elizabeth  Edwards Limited Innovation Drive GB-Burgess Hill, West Sussex RH15 9TW GB-Burgess Hill, West Sussex RH15 9TW (GB)