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).
Modification and standardization of radiator steam valves for the Wraith III, B.3, B.50, and Silver Wraith models.
| Identifier | ExFiles\Box 150\2\ scan0108 | |
| Date | 29th June 1938 | |
| ST {Capt. P. R. Strong} /NS. {Norman Scott} C. Mr. C. HL. C. Rm {William Robotham - Chief Engineer} /Std. DA. {Bernard Day - Chassis Design} 5/G.29.6.38. STD RE: RADIATOR STEAM VALVES. WRAITH 111, B.3, B.50 and SILVER WRAITH. /1280 In accordance with Rm {William Robotham - Chief Engineer} /Std.1/MH. {M. Huckerby} 15.6.38. asking for the adoption of a steam valve for Wraith 111, on the lines of S.CD.730, we have reduced the height of the valve as suggested in that scheme to suit it for production (PD.214 herewith). The spring is unchanged except for equally reduced "free" and "normal" lengths to suit the reduced casing. Plain studs have been introduced in the place of those with taper seats, as the latter appear to be unnecessary. The stud centres remain unaltered. We cannot use a steam valve of the type of PD.214 on B.3 and its derivative radiators, as the steam pipe passed down the face of the matrix and cannot be removed with the valve body. A valve with a plug at the top was designed for these radiators on PD.150. On PD.216 herewith we shew a modification to this valve to enable the plug to be a standard piece KB.1063. The spring is reduced in diameter, but has the same rating and normal load as that tested and shewn on S.CD.730. The set screw centres have had to be increased slightly. In order not to have two designs of steam valve in production in parallel, we suggest that this valve PD.216 be used on Wraith 111, as well as B.3 and its derivatives. It will be noticed that on B.3 and B.50, the pipe inside the tank is not required, as the steam valve is on top of the tank, so that the inner flange piece is also not required, the set screw head coming against the sheet metal stiffening piece. DA. {Bernard Day - Chassis Design} | ||