(19)

(11)

EP 0 287 564 A1

(12)

(43) Date of publication: 26.10.1988 Bulletin 1988/43 (21) Application number: 87900197.0 (22) Date of filing: 11.12.1986

(51) International Patent Classification (IPC):  F04B 39/ 10( . ) F16K 15/ 08( . ) (86) International application number: PCT/GB1986/000756 (87) International publication number: WO 1987/003934 (02.07.1987 Gazette 1987/14)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 21.12.1985 GB 19850031550 (71) Applicant: WILLIAMS, David Godfrey Wirral Merseyside L47 1HD (GB)	(72) Inventor: WILLIAMS, David Godfrey Wirral Merseyside L47 1HD (GB) (74) Representative: Gilmour, David Cedric Franklyn, et al  POTTS, KERR & CO. 15 Hamilton Square Birkenhead Merseyside L41 6BR Birkenhead Merseyside L41 6BR (GB)