Patent · US Expired

Process for the production of a sodium-filled valve

US4406046A · kind A · utility

7Cited by

7References

2Claims

0Family size

Assignee

MTU Motoren-und Turbinen-Union MÃƒÂ¼nchen GmbH · DE

Inventors

Peter Adam · Wuppertal, DE
Horst Meyer-Spradow · Dransfeld, DE
Lothar Reisinger · Dachau, DE

Key dates

Filing date	Sep 4, 1980
Grant date	Sep 27, 1983
Priority date	—
Expiry date	Sep 4, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49307
WIPO fieldMachine tools
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.