Valves and valve actuation – Valve – Materials
Patent
1993-04-16
1994-01-04
Chambers, A. Michael
Valves and valve actuation
Valve
Materials
13762541, 137 15, F16L 500
Patent
active
052753778
ABSTRACT:
A valve disk of silicon-infiltrated silicon carbide material for control elements for regulating liquid flows is suitable in particular for service-water mixer valves. The silicon carbide material contains 70 to 90% by weight of silicon carbide and 8 to 30% by weight of silicon with a content of most 0.2%, by weight of free carbon and contains at most 0.1% by volume of closed pores. The valve disk has a functional surface having the optical appearance in the form of isolated islands of bearing surfaces surrounded by a level lying lever with respect to the isolated islands, the functional surface having the following microtopographical characteristics over its entire region: R.sub.a : 0.02 to 0.80 .mu.m, preferably 0.15 to 0.40 .mu.m; R.sub.t : 0.50 to 6.00 .mu.m,; R.sub.z : 0.20 to 100 .mu.m: flatness: 0.0002 to 0.01 mm; t.sub.pi : 40 to 80% (at 0.3 .mu.m cut depth); t.sub.pa : 10 to 60% (at 0.3 .mu.m cut depth). The invention also relates to a process for producing the valve disk.
REFERENCES:
patent: 3533444 (1970-10-01), Lyon
patent: 3736959 (1973-06-01), Parkison
patent: 3837356 (1974-09-01), Selep et al.
patent: 4327758 (1982-05-01), Uhlmann
patent: 4337920 (1982-07-01), Parris
patent: 4856758 (1989-08-01), Knapp
Chambers A. Michael
Hoechst Ceramtec Aktiengesellschaft
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