The Trend in Poppet Valves

390158

01/01/1939

Event
Pre-1964 SAE Technical Papers
Authors Abstract
Content
THE trend in poppet valves during the past year, like many other advances in science, Mr. Colwell points out, has been an improvement upon existing performance, rather than an entirely new development. To effect a steady improvement in existing designs, the study of fundamentals, such as grain flow, structure, forging temperatures, coolants, and interior construction, has been resorted to, and thorough research on valve steels has been carried out, he reports. In the study of valve steel, 300 analyses were examined; intensive work was done on 20; and 4 showed definite merit, he says.
Grain flows in aircraft valves made by the extrusion and gather-upset processes are compared. Results of an investigation of sodium cooling and head designs of aircraft valves by means of glass valves are reported and illustrated. Four outstanding automotive valve steels are analyzed chemically and physically - Silcrome No. 1, Silcrome XB, Silcrome X-10, and Silcrome XCR. Mr. Colwell also discusses rotating valves, sticking valves, valve guides, grain flow, valve-seat inserts, valve retainer locks, “superfinish,” and surface treatment.
Meta TagsDetails
DOI
https://doi.org/10.4271/390158
Pages
10
Citation
Colwell, A., "The Trend in Poppet Valves," SAE Technical Paper 390158, 1939, https://doi.org/10.4271/390158.
Additional Details
Publisher
Published
Jan 1, 1939
Product Code
390158
Content Type
Technical Paper
Language
English