Metal seals for check valves
US5893389A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1998 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Jun 2, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7868
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A poppet check valve (20) in the embodiment of FIG. 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 FIGS. 3-7. The embodiment of FIG. 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.