(19)

(11)

EP 0 513 268 A1

(12)

(43) Date of publication: 19.11.1992 Bulletin 1992/47 (21) Application number: 91919885.0 (22) Date of filing: 11.11.1991

(51) International Patent Classification (IPC):  F16K 7/ 16( . ) F16K 41/ 10( . ) F16K 7/ 12( . ) (86) International application number: PCT/GB1991/001973 (87) International publication number: WO 1992/009835 (11.06.1992 Gazette 1992/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 23.11.1990 GB 19900025531 (71) Applicant: SAUNDERS VALVE COMPANY LIMITED Cwmbram Gwent NP44 3XX Wales (GB)	(72) Inventor: RAIKES, Robert Reginald Newport, Gwent NP9 7HT (GB) (74) Representative: Goodenough, Nigel  A.A. Thornton & Co. Northumberland House 303-306 High Holborn London WC1V 7LE London WC1V 7LE (GB)