Valve
US4754950A · kind A · utility
39Cited by
9References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1985 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Oct 29, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12937
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is disclosed a valve comprising one valve seat ring, of a disc or a body, having a surface composed of a Cr-Mn-Fe system or a Cr-Ni-Fe system Fe-based precipitation hardening type alloy, and another valve seat ring thereof having a surface composed of a Cr-Ni system Ni-based alloy having a hardness Hv of 400 or more. The valves of this invention can have excellent wear resistance, cavitation erosion resistance and galling resistance, and since emitting no cobalt, the valves of this invention are suitable for various plants such as chemical plants, particularly nuclear power plants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.