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).
Letter from S. Smith & Sons regarding the examination of Bellows for thermostats.
| Identifier | ExFiles\Box 156\2\ scan0065 | |
| Date | 9th April 1938 | |
| R.P.81 S. SMITH & SONS (Motor Accessories) LTD. CRICKLEWOOD WORKS, LONDON, N.W.2. CONTINUATION NO. 1 Messrs. Rolls-Royce Ltd. 9th April 1938. We have examined sixteen (16) Bellows taken at random from stock and find these vary as under:- Maximum - 1.320 Minimum - 1.218. As we have already stated this is not a serious handicap for ordinary jobs which are set to start opening at low temperatures, namely, 70/73°C. You will remember that when we offered you this particular Thermostat we put forward a perfectly standard job, but you will appreciate that we can give you exactly what you want in regard to valve lift in the event of bellows puncture simply by having a sufficient number of convolutions which will ensure that the valve has a predetermined lift. On the other hand, as already stated, we would like an opportunity of examining the Thermostat under discussion in case we can discover any particular reason for this low lift when punctured. In the case of a Thermostat set at 70/73°C. if punctured we would expect the valve to go 3/16" to 1/4" open. May we suggest that we make you up a special Thermostat having the same characteristics as the one referred to but to give a definite lift. Yours faithfully, For S. SMITH & SONS (MOTOR ACCESSORIES) LIMITED. THERMOSTATIC CONTROL DEPARTMENT. | ||