(19)

(11)

EP 0 540 589 A1

(12)

(43) Date of publication: 12.05.1993 Bulletin 1993/19 (21) Application number: 91913297.0 (22) Date of filing: 03.07.1991

(51) International Patent Classification (IPC):  F16K 37/ 00( . ) (86) International application number: PCT/US1991/004733 (87) International publication number: WO 1992/001185 (23.01.1992 Gazette 1992/03)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 09.07.1990 NL 19900001562 (71) Applicant: KEYSTONE INTERNATIONAL HOLDINGS CORP. Houston Texas 77040 (US)	(72) Inventor: LEMMENS, Rudolphus, Petrus, Marie NL-4847 SR Teteringen (NL) (74) Representative: Ruschke, Hans Edvard, Dipl.-Ing., et al  Patentanwälte Ruschke & Partner Pienzenauerstrasse 2 D-81679 München D-81679 München (DE)