(19)

(11)

EP 0 424 450 A1

(12)

(43) Date of publication: 02.05.1991 Bulletin 1991/18 (21) Application number: 89908441.0 (22) Date of filing: 13.07.1989

(51) International Patent Classification (IPC):  F16K 31/ 00( . ) F16K 31/ 365( . ) (86) International application number: PCT/GB1989/000803 (87) International publication number: WO 1990/000694 (25.01.1990 Gazette 1990/03)

(84) Designated Contracting States: CH DE FR GB IT LI NL (30) Priority: 13.07.1988 GB 19880016699 (71) Applicant: Heneker, Stephen Richard Ruislip Middlesex HA4 7XR (GB)	(72) Inventor: Heneker, Stephen Richard Ruislip Middlesex HA4 7XR (GB) (74) Representative: Enskat, Michael Antony Frank, et al  Saunders & Dolleymore 9, Rickmansworth Road Watford Hertfordshire WD1 7HE Watford Hertfordshire WD1 7HE (GB)