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).
Tests on a non-return drainage valve for the 25/30 HP engine induction system.
| Identifier | ExFiles\Box 103\4\ scan0147 | |
| Date | 23th January 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} x519 Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation}5/KW.23.1.36. 25/30 HP. Engine — Induction System. Further to our report Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation}1/KW.22.1.36. Tests have been carried out in conjunction with the induction pipe Ex.21111, mentioned in the above report, to provide an effective non-return valve for the drainage scheme. Parts under test. Ex.21126 Drain Body } Ex.21048 Union } Drainage assembly .312 dia. Dural Ball } (non-return valve). Object. (1) To find the best position for the valve to be placed; i.e., close up to the well, or lower down the crankcase at the end of the drain pipe. (2) To determine the ball travel, relative to drain flow and effective depression to return valve to its seat (compromise). (3) Having fixed (1) and (2), to note behaviour of ball valve under cold starting conditions. Results. (1) Position. No difference could be found between placing the valve as close as possible to the well, and placing the valve at the end of a 14" long drain pipe. (2) Ball Travel. See curve No.5, which shows that the flow is not restricted until the travel is reduced to .050". Using this travel (.050") at low speeds full throttle :- Ball comes off its seat at 350 r.p.m. = .037"Hg. Ball comes back on to its seat at 460 r.p.m. = .022"Hg. | ||