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).
Description of the S.U. Electric Pressure Type Pump and its operation.
| Identifier | ExFiles\Box 163\1\ img007 | |
| Date | 12th September 1933 guessed | |
| 6007. S.U. ELECTRIC PRESSURE TYPE PUMP. This pump differs from the S.U. Petrolift Fuel pump mainly in that it delivers under pressure to the carburetter. The principal elements of the pump are the Body Casting "A" in Gunmetal, which contains the suction and delivery valves "H" and "J", the Filter "F", and a large capacity air chamber occupying the internal part of the casting, the function of which is to damp out pulsations on the suction pipe line. The pump is of the diaphragm type, the diaphragm material being of a unique type, and having been arrived at as a result of a long series of tests on different materials, many of which are commonly used in diaphragm fuel pumps, in conjunction with samples of fuel of every obtainable type. The diaphragm indicated by letter "K" is mounted on a soft iron armature "D", which in turn is drawn into the magnetic circuit formed by the iron body "B", and central iron core "E", and upon the magnetic circuit being interrupted, is released and driven upwards by the coil spring "S". The movement of the armature and diaphragm from right to left draws in fuel by way of the air chamber, the filter "F", the inlet valve "H" and passage "G". It s movement in the opposite direction; that is, under the influence of the spring "S" expels the fule through passage "G" valve "J" and outeatds through the delivery union "T". The current in the solenoid "C" which causes the electro magnetic action, is made and broken by the contact points "P". These contact points are alternatively opened and closed at the extremities | ||