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 graphs for a J III rear conical seated valve under various pressure and seating conditions.
| Identifier | ExFiles\Box 105\3\ scan0286 | |
| Date | 16th September 1932 guessed | |
| Top-Left Panel: JIII REAR. 90/90 LB. HIGH PRESSURE N.S. 3497 CONICAL SEATED VALVE VALVE ON SEAT. VALVE PISTON ON STOP. 1" STROKE 308 LB/D" = 133 LB. B.P. 120" I.S. R.P.M. 540 360 1.5 180 90 Top-Right Panel: JIII REAR. 90/90 LB. LOW PRESSURE N.S. 3497 CONICAL SEATED VALVE VALVE ON SEAT. VALVE PISTON ON STOP. 1" STROKE 308 LB/D" = 133 LB. B.P. 120" I.S. R.P.M. 540 360 180 90 Bottom-Left Panel: JIII REAR. 90/90 LB. LOW PRESSURE N.S. 3497 CONICAL SEATED VALVE VALVE RAISED .010" OFF SEAT. 1" STROKE 308 LB/D" = 133 LB. B.P. 120" I.S. R.P.M. 540 360 180 90 Bottom-Right Panel: JIII REAR. 90/90 LB. HIGH PRESSURE N.S. 3497 CONICAL SEATED VALVE VALVE RAISED .010" OFF SEAT. 1" STROKE 308 LB/D" = 133 LB. B.P. 120" I.S. R.P.M. 540 360 180 90 Dates on Panels: 15.9.32 17.9.32 Stamp: ROLLS-ROYCE, LTD. PRINT ROOM NOV 11 1932 DERBY. | ||