Valves and valve actuation – Valve – Materials
Patent
1985-10-29
1988-07-05
Chambers, A. Michael
Valves and valve actuation
Valve
Materials
420 57, 420 59, 428679, B32B 1518
Patent
active
047549505
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.
REFERENCES:
patent: 1979910 (1934-11-01), Scott
patent: 2091745 (1937-08-01), Webb
patent: 2246078 (1941-06-01), Rohn et al.
patent: 2396552 (1946-03-01), Cape
patent: 2698785 (1955-01-01), Jennings
patent: 3278298 (1966-10-01), Perry
patent: 4394169 (1983-07-01), Kaneko et al.
patent: 4430297 (1984-02-01), Crook
patent: 4546737 (1985-10-01), Kazuoka et al.
Metal Progress, May 1981, pp. 35-37 "PH 13-8 MO-Alternative to Cobalt Containing Casting Alloys, E. L. AuBuchon et al.
Chujyo Noriyuki
Fujiwara Tetsuo
Hasunuma Masahiko
Kawai mituo
Tada Kaoru
Chambers A. Michael
Kabushiki Kaisha Toshiba
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