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 results for a J.III Type Shock Damper's conical seated valve damping 'hat'.
| Identifier | ExFiles\Box 105\3\ scan0272 | |
| Date | 4th October 1932 | |
| COPY FOR FILES. 85520. 4.10.32. J.III TYPE SHOCK DAMPERS. N.S.3497 CONICAL SEATED VALVE WITH Hs.{Lord Ernest Hives - Chair}712 VALVE DAMPING "HAT". XS35 The following were found to give the best results, when the valve was set definitely on its seat :- (a) With .005" diametral "hat" clearance, two holes .055" diam were required in the wall of the "hat". (b) With a .032" diam hole in the L.P. face of the valve, and .015" diametral clearance, two holes .093" diam were required in the wall of the "hat". In the case of the former there was a slight tendency to squawk when starting from cold, but there was no building up of static load after recooling; a slight valve knock occurred at approx 1.5 ft/sec mean axle velocity. With the latter setting there was no squawk and no building up of static load, but there was a tendency to knock above a mean axle velocity of 1 ft/sec. When using a .032" diam hole in the L.P. valve face it was found necessary to increase the diametral clearance to .050" when the holes in the "hat" wall were deleted, even then there was an increase of static load on recooling of 25-30%. Under both the above condition (a & b) the static load decreased from 90 to 75 lb at a temperature of approx 60°C, but returned to 90 lb. when recooled. Hs{Lord Ernest Hives - Chair}/W.Bell. | ||