Improvements in or relating to the manufacture of valves

摘要

1,091,847. Making valves. TEVES-THOMPSON & CO. G.m.b.H. July 14, 1965 [Oct. 6, 1964], No. 29833/65. Heading B3A. In the manufacture of sodium-filled poppetvalves, the completed valve is heat treated at temperatures above the boiling point of the sodium enclosed therein, preferably in the range 1000‹ to 1050‹ C.