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).
Recurring faults with Petrol Pressure Relief Valves and issues with their repair.
| Identifier | ExFiles\Box 81\2\ scan0007 | |
| Date | 2nd July 1914 | |
| R.R. 235A (150 H) (W.W. 529. 2-7-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0670. C O P Y. [Handwritten on left: X1092] Hm{Capt. W. Hallam - Head Repairs}4/DW23714. Re Petrol Pressure Relief Valves. N-W We find the above are always the first Wor{Arthur Wormald - General Works Manager} thing to go wrong with our pressure feed system. J.{Mr Johnson W.M.} z The cause of this is that the piston valve wears and becomes too slack a fit and will not then hold pressure, and when the pump is work- ing the pressure leaks out of the valve rather than pass along the pipes to the tank. When these valves are returned from Derby after repairs, we often find that they are not a good enough job to fit on cars. [STAMP: OFFICE COPY RECEIVED AT CROXLEY] We quite appreciate that in order to make the valves work well, the limit of accuracy must be very fine, as only a small amount of wear will render them useless. The fault when they are returned after repair is that the bore of the cylinder is not round, and probably this is caused by lapping after grinding. On the other hand if the valves are a good fit when new, they last long enough without giving trouble, so that it appears that we ought either to pay special attention to the fitting, or if these limits are too fine alter the design. Hm.{Capt. W. Hallam - Head Repairs} | ||