(19)

(11)

EP 2 809 880 A2

(12)

(88) Date of publication A3: 30.01.2014 (43) Date of publication: 10.12.2014 Bulletin 2014/50 (21) Application number: 13703637.2 (22) Date of filing: 29.01.2013

(51) International Patent Classification (IPC):  F01C 21/10(2006.01) F04C 18/12(2006.01) F04C 23/00(2006.01) F04C 25/02(2006.01) (86) International application number: PCT/GB2013/050188 (87) International publication number: WO 2013/114093 (08.08.2013 Gazette 2013/32)

(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 (30) Priority: 30.01.2012 GB 201201555 (71) Applicant: Edwards Limited Crawley, West Sussex RH10 9LW (GB)

(72) Inventors: GRAY, Malcolm William Burgess Hill West Sussex RH15 9TT (GB) NELLER, Paul David Burgess Hill West Sussex RH15 9TT (GB) TURNER, Neil Burgess Hill West Sussex RH15 9TT (GB) TATTERSALL, Jack Raymond Burgess Hill West Sussex RH15 9TT (GB) (74) Representative: Clark, Charles Robert et al Edwards Limited Intellectual Property Manor Royal Crawley West Sussex RH10 9LW Crawley West Sussex RH10 9LW (GB)