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).
Alterations to the springs in Phantom relief valves due to incorrect ratings and their effect on oil pressure.
| Identifier | ExFiles\Box 66a\4\ scan0028 | |
| Date | 1st June 1927 | |
| To Hs.{Lord Ernest Hives - Chair} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} c. to BY.{R.W. Bailey - Chief Engineer} [Struck through] X8205 Hs{Lord Ernest Hives - Chair}/GWH{George W. Hancock - Head Chateauroux}1/LG9,6.27. PHANTOM RELIEF VALVES. In the production of the relief valves/of [handwritten] the springs have been altered to those instructed and passed by the Expl: Dept: [Handwritten note in margin: the values] The reason for this is apparently the result of the bow spring coming out at a much higher rating than those manufactured and tested in the Expl: Dept: with the result that higher rating low pressure springs have been fitted to close the valve [word 'valve' is struck through]. This increases the oil pressures considerably and does not conform with our requirements. In conjunction with BY.{R.W. Bailey - Chief Engineer} we have got out a low pressure spring as a compromise to bring down the pressures to reasonable limits, until full investigations have been carried out in the manufacture of the bow springs. We give a chart shewing No.1 as [text struck through] passed to D.O. for production. No.2. as works produced. No.3. as agreed to for the time being. Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||