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).
Performance curve for an induction system non-return valve, charting fuel flow against ball travel.
| Identifier | ExFiles\Box 103\4\ scan0154 | |
| Date | 24th February 1936 guessed | |
| 2530 P INDUCTION SYSTEM. NON-RETURN VALVE CURVE Nọ5 Ex 21126 DRAIN BODY Ex 21048 UNION WITH 3/32 DIA DURAL BALL NON-RETURN VALVE ASSEMBLY FUEL FLOW 50 40 30 20 10 BALL TRAVEL (INCHES) .100 .090 .080 .070 .060 .050 .040 .030 .020 | ||