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 use of a ball valve to improve pump efficiency by excluding air from the system.
| Identifier | ExFiles\Box 27\1\ Scan052 | |
| Date | 29th January 1929 guessed | |
| Contd :- -3- BALL VALVE. We find that there is little chance of excluding the air completely from the system, and though Bijurs do not make use of a non-return ball valve, we find that the efficiency of the pump is improved by fitting one just below the valve proper. Hs{Lord Ernest Hives - Chair}/F.{Mr Friese} Gaye. | ||