Process for the production of a sodium-filled valve

Details Process for the production of a sodium-filled valve Process for the production of a sodium-filled valve

1980-09-04

1983-09-27

Crane, Daniel C.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

123188A, 219121EG, 53408, 53432, B23P 1500, F01L 314

Patent

active

044060467

ABSTRACT:
A process for the production of a sodium-filled valve in which the sodium is introduced into a hollow valve stem through a filling bore of relatively large diameter and which is sealed through a plug and/or usual welding. Subsequent to the closing off of the filling bore, the hollow inner space is evacuated through a passageway having a small cross-section and is thereafter sealed vacuum-tightly in a vacuum through either welding or soldering. Through the evacuation of the hollow space there is avoided any kind of oxydation of the sodium and thereby any change. Moreover, no froth or foam formation is encountered so as to facilitate the presence of an extremely constant heat transfer.

REFERENCES:
patent: 2157610 (1939-05-01), Jardine
patent: 2365285 (1944-12-01), McDill
patent: 2367756 (1945-01-01), Cummings
patent: 2814382 (1957-11-01), Lassiter
patent: 2997397 (1961-08-01), Dougheridis
patent: 3710773 (1973-01-01), Piech et al.
patent: 4069978 (1978-01-01), El Moussa

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