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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).
The design and performance of the 'AMAL' double fabric type petrol pump.

Identifier  ExFiles\Box 27a\2\  Scan075
Date  14th June 1932
  
"AMAL" PETROL PUMP.

DOUBLE FABRIC TYPE.

This pump contained two separate chambers, one of which functioned as a delivery pump, and the other as a relief valve; each contained fabric diaphragms. The pump section was more or less conventional, the inlet, and outlet ports being controlled by ball valves - not spring loaded. The filter was attached directly to the inlet passage.

The spring controlled relief valve fabrics were attached to a plunger, designed to provide communication between the outlet, and the inlet passages at a predetermined outlet pressure.

The relief chamber fabrics apparently had no definite pumping action, however, since the cavity was connected directly with the outlet passage, a good outlet pressure stabilizing chamber was formed.

The results obtained showed that the delivery rose rapidly between 50 and 250 P.R.P.M., to 130 pts/hr, and between 250 and 2000 P.R.P.M., varied between 130 and 150 pts/hr., with a max back pressure (delivery cut off) at 2000 P.R.P.M. of 1.4 lb/sq.in.

The time taken to commence pumping with a dry pipe line at 20 P.R.P.M. was 1 mins 20 secs, / at 50 P.R.P.M. the time required was 25 secs. and

The attached graph illustrating the relative merits of the RR Lec.2961 (fabric diaphragm), the "AMAL" fabric diaphragm, and the "AMAL" metal piston pumps, shows that the "AMAL" fabric type reaches a high delivery at fairly low speeds, and maintains that level, whereas the RR delivery is more gradual, and reaches the same max delivery at the max pump speed of 2000 R.P.M.
  
  


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