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).
Test results and details for various float chamber ball drain valve configurations and conversions.
| Identifier | ExFiles\Box 93\2\ scan0222 | |
| Date | 1st February 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/GR.{George Ratcliffe}9/JH.1.2.38. (1) .140 seating single ball valve at bottom end of manifold drain pipe and separate drain pipe from floatchamber cover. Ball drain 12 pts/hr. Floatchamber drain 132 pts/hr both drains 144 pts/hr. (2) As (1) but with .180 needle seating. Ball drain 17 pts/hr. floatchamber drain 143 pts/hr Both drains 160 pts/hr. (3) .140 seating duel ball valves and junction of floatchamber drain pipe as existing production. Both drains 144 pts/hr. (4) As (3) but with .180 needle seating. Both drains 160 pts/hr. There are a dozen Rm.{William Robotham - Chief Engineer} 477/8 now in hand for use on complaints. 30 H.P. Ball drain valve. A similar conversion has been made for the 30 H.P. complaints but unfortunately no car was available for test. This was detailed to Rm.{William Robotham - Chief Engineer} 479/80 and consists of identical details with the Phantom III valve body but is adapted without additional piping and using the existing ball valve. There are a dozen Rm.{William Robotham - Chief Engineer} 479/80 now in hand for use on complaints. Rm{William Robotham - Chief Engineer}/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Ratcliffe. | ||