(19)

(11)

EP 2 350 462 A1

(12)

(43) Date of publication: 03.08.2011 Bulletin 2011/31 (21) Application number: 09752335.1 (22) Date of filing: 06.11.2009

(51) International Patent Classification (IPC):  F15B 15/10(2006.01) (86) International application number: PCT/EP2009/064756 (87) International publication number: WO 2011/054394 (12.05.2011 Gazette 2011/19)

(84) Designated Contracting States: 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 SE SI SK SM TR (71) Applicant: ABB Research Ltd. 8050 Zürich (CH)	(72) Inventor: COJOCARU, Basarab 114 20 Stockholm (SE) (74) Representative: Savela, Reino Aleksi  ABB AB Intellectual Property Ingenjör Bååths Gata 11 72 183 Västerås 72 183 Västerås (SE)