(19)

(11)

EP 0 081 517 A1

(12)

(43) Date of publication: 22.06.1983 Bulletin 1983/25 (21) Application number: 82901726.0 (22) Date of filing: 11.06.1982

(51) International Patent Classification (IPC):  F16K 7/ 14( . ) F16K 15/ 14( . ) E03F 7/ 04( . ) (86) International application number: PCT/GB1982/000177 (87) International publication number: WO 1982/004471 (23.12.1982 Gazette 1982/30)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 15.06.1981 GB 19810018328 (71) Applicant: HYDRO RESEARCH & DEVELOPMENT (UK) LIMITED Bristol, BS1 5RR (GB)	(72) Inventor: MAEGARD, Carl Wilhelm Falmouth Forside, ME 04105 (US)