(19)

(11)

EP 0 254 715 A1

(12)

(43) Date of publication: 03.02.1988 Bulletin 1988/05 (21) Application number: 86901944.0 (22) Date of filing: 13.03.1986

(51) International Patent Classification (IPC):  F16L 55/ 179( . ) F16L 55/ 26( . ) (86) International application number: PCT/GB1986/000149 (87) International publication number: WO 1986/005569 (25.09.1986 Gazette 1986/21)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 13.03.1985 GB 19850006556 (71) Applicant: BRICKHOUSE DUDLEY PLC Tipton West Midlands DY4 7XD (GB)	(72) Inventors: BROUGH, Ian, James E W Avent Ltd. Wiltshire SN11 9BW (GB) WESTERMAN, Graham E W Avent Ltd. Wiltshire SN11 9BW (GB) JONES, Michael, A. E W Avent Ltd. Wiltshire SN11 9BW (GB) (74) Representative: Orr, William McLean  URQUHART-DYKES & LORD 5th Floor, Tower House Merrion Way Leeds West Yorkshire, LS2 8PA Leeds West Yorkshire, LS2 8PA (GB)