Metal working – Method of mechanical manufacture – Valve or choke making
Patent
1995-08-01
1998-10-27
Schwartz, Larry I.
Metal working
Method of mechanical manufacture
Valve or choke making
2989031, 29460, 228165, 251359, B21D 5300
Patent
active
058263365
ABSTRACT:
The invention relates to a process for the production of series-produced valves which are used in heating, ventilating and air-conditioning systems and which comprise a cast-iron valve body, at least one stainless steel valve seat disposed in a flow restrictor opening in the valve body and an actuating rod having at least one flow restrictor, the actuating rod being taken out of the valve through a cover which closes an opening for the cover in the valve body, such opening being in alignment with the valve seat. The valve seat is welded into a casting serving as blank for the valve body without previous chip removal treatment of the casting surface, in one chucking. The blank is then finish-treated. Preferably, the valve seat is produced by build-up welding followed by chip removal shaping of the weld bead.
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Metals Handbook, 8th Ed, vol. 6 "Welding and Brazing" Amer. Soc. for Wheels, 1971 pp. 148-151, Originally from Welding Handbook, 6th Ed. Sec.1, 1968.
Modern Welding Technology, Howard B. Gary Feb. 13, 1980 pp. 501-517.
Butler Marc W.
Johnson Service Company
Schwartz Larry I.
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