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).
Test report on the J.III type shock damper's N.S.3670 HDY valve, comparing its performance with and without an integral 'hat'.
| Identifier | ExFiles\Box 105\3\ scan0334 | |
| Date | 5th May 1933 | |
| X5820. To Hdy.{William Hardy} from Hs{Lord Ernest Hives - Chair}/W.Bell. c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/WB.{Mr Brazier/Mr Bell}9/KT.5.5.33. J.III TYPE SHOCK DAMPERS. N.S.3670 HDY.{William Hardy} VALVE. This valve was supplied with an integral "hat" and when fitted to the test damper complete with valve damping cylinder in the same manner as the taper valve, it was similarly quiet both during bench and rig tests. The static loading on the H.P. stroke was practically indeterminable when the L.P. was set at 90 lb. (the latter stroke operating similarly to the taper valve) for, after overcoming the piston air vent leak, there was no definite sensation of valve lift. High pressure diagrams were taken with + .015, 0, and -.015" valve overlap, from which it was evident that the pressure velocity characteristic was now extant, also the H.P. to L.P. leak effect with the -.015" overlap was illustrated. When tested without the steadying influence of the "hat" in the valve damping cylinder, this valve was as noisy as the taper valve under similar conditions, and a H.P. diagram taken (with +.015 overlap) illustrated the pressure variations obtained with this valve when not damped. In order to obtain some information re. this scheme as quickly as possible, the valve chamber was fitted to the test damper without an indicator adaptor, therefore no L.P. diagrams were obtainable. So far this type of valve has shown no improvement on the taper valve. Hs{Lord Ernest Hives - Chair}/W.Bell. | ||