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).
Analysis of a bellows unit failure, discussing valve opening dimensions and awaiting manufacturer information.
| Identifier | ExFiles\Box 156\2\ scan0028 | |
| Date | 17th February 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/Std.3/AP.17.2.38 has done very little running, in order to determine whether its free length is such that the valve will be full open after failure. We find that its free length is such that the valve would be .170" open if the bellows punctured. While this should be adequate to prevent over-heating, it indicates that the free length of this bellows is such that the valve does not go to full open position (.300 lift) if bellows fails. This means that either this bellows unit did not have the free length stated by the makers or else their explanation of water pressure reducing free length of bellows is correct. Also the same thing applies to the bellows which failed - actually after failure the valve was only lifted approximately .080". We are awaiting further information from the makers on this subject. Rm{William Robotham - Chief Engineer}/Std. | ||