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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).
Test results for pull-in voltage, current consumption, and temperature rise for three different tap models.

Identifier  ExFiles\Box 163\1\  img052
Date  1st April 1939
  
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Rm{William Robotham - Chief Engineer}/RC.{R. Childs}8/JH.1.4.39.

No.1120.X.

Pull in - 6.0 volts.
Current at 12 volts - 0.98 amperes.

The above values obtained cold, no pumps connected.

In order to check temperature rise, two of the taps were connected to a 12 volt supply for a period of 30 minutes, at the end of this time the operating voltage and current consumptions were as follows -

No.800.X.

Pull in - 7.35 volts.
Current at 12 volts - 1 ampere.
Temperature rise - 74.8°C.

No.1120.A.

Pull in - 6.75 volts.
Current at 12 volts - 0.75 amperes.
Temperature rise - 66.6°C.

The above temperature rise is only given for comparison purposes, under normal conditions it will be appreciably lower due to the petrol passing through the tap.

A further test proved the absence of any leakage at the valve seating.

Attached are curves showing pressure on the seating against voltage across the coil.

Rm{William Robotham - Chief Engineer}/RC.{R. Childs}
  
  


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