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).
Investigation report on shock damper valve tests for the F.85641 valve assembly, addressing a leakage complaint.
| Identifier | ExFiles\Box 151\2\ scan0122 | |
| Date | 18th December 1933 | |
| C O P Y. Hs {Lord Ernest Hives - Chair} /Les. X4698. 18.12.33. Shock Damper Valve Tests. F.85641 Valve Assembly. Following a complaint from the production department that after assembling and rivetting the valve with the correct clearance (.005"), and subjecting it to the maximum load - 30 lb./sq.in. external pressure - the disc moved further along the taper, thus taking up the clearance, causing the valve to leak. Three valves were tested in investigating this complaint, the stem being fixed, and the disc loaded in 10 lb. stages, the load being removed after each increase, and the overall length of the valve measured, with the following maximum results :- A. {Mr Adams} DISC PRESSED ON BY HAND - NOT RIVETTED. Load 160 lbs. Movement .006". B. PRODUCTION ASSEMBLY - RIVETTED. Load 200 lbs. Movement .001". C. PRODUCTION ASSEMBLY - RIVETTED. Load 200 lbs. Movement .001". The maximum spring load on the valve is estimated to be 30 lb., and even allowing for the pressure of the oil behind the valve, the above loads should allow a good factor of safety. It can only be presumed, therefore, that the valve discs have not been allowed sufficient "draw" before rivetting. (Signed) W. Bell. | ||