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).
Graphs showing performance of a conical seated valve under high and low pressure, with and without an oil groove to bearings.
| Identifier | ExFiles\Box 105\3\ scan0285 | |
| Date | 12th September 1932 | |
| Top Left Quadrant: J III REAR 90/90LB. HIGH PRESSURE. N.S 3497 CONICAL SEATED VALVE. OIL GROOVE TO BEARINGS .032" WIDE x .015 DEEP 1" STROKE. 308 LB./D" = 133 LB. B.P. R.P.M. 540 360 180 90 120" I.S. 12.9.32 Top Right Quadrant: J III REAR 90/90LB. HIGH PRESSURE. N.S 3497 CONICAL SEATED VALVE. No OIL GROOVE TO BEARINGS. 1" STROKE 308 LB./D" = 133 LB. B.P. R.P.M. 540 360 180 90 120" I.S. 12.9.32 Bottom Left Quadrant: J III REAR 90/90LB. LOW PRESSURE. N.S. 3497 CONICAL SEATED VALVE. OIL GROOVE TO BEARINGS .032" WIDE x .015" DEEP 1" STROKE CORRECT VENT IS .030 WIDE AND .030 DEEP 308 LB./D" = 133 LB. B.P. R.P.M. 540 360 180 90 120" I.S. 12.9.32 Bottom Right Quadrant (Stamp): ROLLS-ROYCE, LTD. PRINT ROOM NOV 11 1932 DERBY | ||