Valves and valve actuation – Valve – Seats
Patent
1990-01-09
1990-07-17
Fox, John C.
Valves and valve actuation
Valve
Seats
251326, F16K 330
Patent
active
049416448
ABSTRACT:
A valve stem formed by evaporative pattern (or lost foam) casting a hollow or solid rod member inside of the elongated outer member. Since the stem is thereby cast to near net shape, little machining is required to finish it. The elongated member can have on its outer surface coarse square threads, a thrust ring, a flattened transition and a retaining nut threaded end. The rod member can advantageously be made of a material that is stronger and less expensive than that of the copper base alloy of the elongated member.
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Fox John C.
Robinson Foundry, Inc.
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