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 specifications for springs in a Phantom oil relief valve.
| Identifier | ExFiles\Box 66a\4\ scan0027 | |
| Date | 1st January 1927 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to BY/Shn. X8205 Hs{Lord Ernest Hives - Chair}2/LG6.1.27. PHANTOM OIL RELIEF VALVE. Arrgt.drg. E.75105. Springs for release valve should be as follows :- Main E.75748 giving 3 lbs. 12 ozs. at .600, 4 lbs. 8 ozs. at .475". This spring will give 18 lbs. pressure at 250 r.p.m. and 28 lbs. at 2000 r.p.m. Rocker and gear E.75751 giving 4.5 ozs. at .525, 5 ozs. at .400. The oil pressure to the rockers will be from 1 to 4 1/2 lbs., to the gears up to 1 1/2 lbs. These springs have been altered due to too high a pressure of oil with springs E.75725 and E.75424. Pressures taken with oil at 60ºC. Hs.{Lord Ernest Hives - Chair} | ||