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1. (WO1999008028) METAL SEALS FOR CHECK VALVES

Pub. No.:    WO/1999/008028    International Application No.:    PCT/US1998/015485
Publication Date: Fri Feb 19 00:59:59 CET 1999 International Filing Date: Tue Jul 28 01:59:59 CEST 1998
IPC: F16K 15/06
Applicants: FMC CORPORATION
Inventors: CUNNINGHAM, Christopher, E.
Title: METAL SEALS FOR CHECK VALVES
Abstract:
A poppet check valve (20) in the embodiment of Figure 1 has a valve body (30) with a fixed unyielding metal seat (38) for engaging in metal-to-metal sealing contact with a sealing surface (48) on poppet valve member (34) at relatively high fluid pressure ranges. The metal seats (38 and 48) may both be frusto-conical in shape or one frusto-conical and the other spherical. A compliant metal sealing member (42) engages sealing surface (48) in metal-to-metal sealing relation at low fluid pressures prior to engagement of sealing surface (48) with fixed metal seat (38) at high fluid pressures. Alternative embodiments are shown in Figures 3-7. The embodiment of Figure 7 shows a poppet check valve with a pair of staged flexible metal sealing members (42D, 43D) which are integral with body (30D) for progressively engaging the sealing surface (48D) of poppet valve member (34D) prior to engagement of fixed metal seat (38D).