Design of an air pressure relief valve, referencing a Cadillac design as an improvement.
| Identifier | ExFiles\Box 81\2\ scan0010 | |
| Date | 28th July 1921 | |
| C O P Y. cc Mr Belnap. Mr. Nadin. Oy2 - C 28721. July 28th 1921. Mr. Claude Johnson. Managing Director. Rolls-Royce Ltd., London. England. Attention. Mr. Royce. Dear Sir, Re Air Pressure Relief Valve. Mr. Royce will recall that I wrote on Sept. 24, '20 for his attention, suggesting the use of a sylphon thermostat for pressure relief and delivery valves on the air-pressure system. I now find that the Cadillac uses a relief valve of this type, as shown: AIR PRESSURE GLAND NUT ADJUSTMENT This has the advantages of the pre-war relief valves as far as the diameter of seating is concerned, but gets away from the danger of sticking by the use of a sylphon tube. The Cadillac use a limiting pressure pump like our own, which should not exceed 3 lb. pressure, but they still think it necessary to provide a relief valve. | ||
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).