(19)

(11)

EP 0 415 992 A1

(12)

(43) Date of publication: 13.03.1991 Bulletin 1991/11 (21) Application number: 89906174.0 (22) Date of filing: 25.05.1989

(51) International Patent Classification (IPC):  F16L 58/ 18( . ) F16L 59/ 20( . ) (86) International application number: PCT/GB1989/000576 (87) International publication number: WO 1989/011618 (30.11.1989 Gazette 1989/28)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 26.05.1988 GB 19880012513 (71) Applicant: REGAL TECHNOLOGY (U.K.) LTD. Leith, Edinburgh EH6 7DR (GB)	(72) Inventor: ARNOTT, Thomas, Christopher Alloa Clackmannanshire FK10 1NJ (GB) (74) Representative: Fitzpatrick, Alan James  Fitzpatricks, 4 West Regent Street Glasgow G2 1RS, Scotland Glasgow G2 1RS, Scotland (GB)