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 comparing various valve designs and their effects on chatter, pressure, and silence.
| Identifier | ExFiles\Box 151\2\ scan0040 | |
| Date | 24th March 1933 | |
| -2- Hs {Lord Ernest Hives - Chair} /WB. {Mr Brazier / Mr Bell} 6/KT.24.3.33. of valve chatter, and its attendant squawk. With the Double Area valve the press-velocity effect was reduced, but the pressure was not quite as steady, showing a valve bumping tendency after the initial pressure rise. The Reduced-Seat valve showed a distinct valve bump, with an inclination to chatter. At the higher axle velocity, however, there was a distinct pressure velocity effect. These tests therefore seem to indicate that :- (a) The valve size has a greater effect than the length of seat on the pressure-velocity characteristic. (b) The larger valve although affecting the press-velocity effect does not affect the valve lift, as does the reduced seat. (c) The taper seat does definitely affect the silence. N.B. A 10" lever was used throughout these tests. Hs {Lord Ernest Hives - Chair} /W.Bell. | ||