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 discussing the potential use of Sylphon tubing for a combined delivery and relief valve on an air pump.
| Identifier | ExFiles\Box 78\1\ scan0252 | |
| Date | 24th September 1920 | |
| x3652 OyG - G 24920 Sept. 24, 1920. Mr. Claude Johnson, Managing Director, Rolls-Royce Ltd., London, England. Attention: Mr.F.H.Royce. Dear Sir:- Re: Sylphon Tubing. We send you attached herewith copies of a letter received from the Fulton Company referring to the six samples of small sylphon tubing recently sent us. We would like to draw to Mr. Royce's attention the fact that these sylphons are being used by a car manufacturer here for use in a relief valve on the gasoline tank. This has suggested to us the possibility of using a small sylphon tube of this nature for a combined delivery and relief valve on our existing air pump, on a similar principle to the combined delivery and relief valve used on the pre-war pump. In this valve a small opening was uncovered on the impulse stroke of the air pump by the air pressure acting on a piston. The opening was in the form of a small conical seated valve which also acted as a relief valve, and because of this small area of contact the unit load on the valve surface was enough to insure a tight seat. The only disadvantage that I know of on this valve was that road dust between the piston and its guiding surface prevented the valve from seating properly. If a sealed sylphon tube of the sort sent to Derby had been used instead of the piston, it seems to me that this type of valve would have been ideal. We are bringing this to your attention at the present time because Mr. Hulley has mentioned to us a case which has come to his personal attention, where a car left standing in the sun outside the Service Station [STAMP] RECEIVED OCT 12 1920 U.S. A.{Mr Adams} DEPT. [/STAMP] | ||