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 low pressure inlet ball valve at various RPMs, with and without release vents.
| Identifier | ExFiles\Box 179b\4\ img031 | |
| Date | 6th April 1933 | |
| J III REAR 35/35 LB LOW PRESSURE .250" EXT. PRESS INLET BALL VALVE NO RELEASE VENTS 4" STROKE 308 LB/D" = 133 LB. 120° I.S. R.P.M. 180 135 90 45 GOV PRESS 4LB/D" 45 R.P.M - 0LB/D" AFTER ABOVE TESTS BEFORE TESTS J III REAR 35/35 LB LOW PRESSURE .250" EXT. PRESS INLET VALVE - 1 OFF .032" DIA. RELEASE VENT 4" STROKE B R.P.M. 180 135 90 GOV PRESS 4LB/D" | ||