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).
Blueprint schematic of a double main pressure regulating valve explaining its operation.
| Identifier | ExFiles\Box 179\3\ img173 | |
| Date | 4th April 1932 guessed | |
| BY ALTERING SPRING PRESSURE INSTEAD OF THE AREA OF LEAK. A.{Mr Adams} THE DOUBLE MAIN PRESSURE REGULATING VALVE. THE VALVES ARE HELD ON THEIR SEATS BY THE PRESSURE OF THE SET UP SPRING SEPARATING THEM. THE COMPRESSING OF THIS SPRING IS VARIED BY THE CONTROL LEVER WHICH SCREWS THE SLEEVE B UP AND DOWN, OIL LEAKS BEING PREVENTED BY GLAND C. H.{Arthur M. Hanbury - Head Complaints} HIGH PRESS. OIL PASSAGE L. LOW PRESS. OIL THE JUNCTIONING OF THE VALVE IS AS FOLLOWS: LOW PRESS. OIL PASSES DOWN THE PASSAGE AS INDICATED, LIFTS VALVE A AND SIMULTANEOUSLY FORCES VALVE D ONTO ITS SEAT, HAVING PASSED THROUGH VALVE A THE OIL RETURNS TO THE OTHER SIDE OF THE PISTON VIA VALVE E AND PASSAGE H.{Arthur M. Hanbury - Head Complaints} THE HIGH PRESSURE STROKE IS THE REVERSE, OIL ENTERING THROUGH H, FORCING VALVE E ONTO ITS SEAT, LIFTING VALVE A AND PASSING TO THE OTHER SIDE OF THE PISTON VIA VALVE D.{John DeLooze - Company Secretary} | ||