From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The satisfactory examination of nitrided Firth's H.R. Crown Valves from Nitralloy Ltd.
| Identifier | ExFiles\Box 154a\1\ scan0213 | |
| Date | 17th September 1930 | |
| COPY. X4469 RHC.{R. H. Coverley - Production Engineer} c. Hs.{Lord Ernest Hives - Chair} BY/EM/J.17.9.30. Firth's H.R. Crown Valves. X.4429. X.4469. We have received from Messrs. Nitralloy Ltd., a number of valves produced in the above material which have been nitrided on the stems. A sample of these valves has been examined by the Laboratory and the depth of the nitrided case is found to be .0046" This appears to be quite satisfactory and we shall be glad if these valves could be finished and fitted to engines as it would appear that this may be a satisfactory method of using up the H.R. Crown material which we have in stock, at any rate, as far as inlet valves are concerned. BY/EM. | ||