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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).
Proposed damper scheme using two double-way valves and a replenishment system.

Identifier  ExFiles\Box 17\1\  Scan066
Date  12th October 1931 guessed
  
(2)

I have also in mind that we could get more perfect riding by using two of our double way valves, one loaded for high speed, and one loaded for normal speed, both, or either of them being fitted with a leak which would be cut off when the valve passage was closed. The scheme appears to work out quite neatly and practic-ally by having the valve cover on the low speed end of the damper, and the two valves and control on the cover, the passage from these two valves being a single one underneath the damper. We can see no reason why this two way valve should not be even more silent than two separate valves because it need not close on the reversal and need never close on to a face, but can be a shrouded type of valve. Drawings for this will be sent at an early date.

You will remember that I have pressed for a replenishing pipe to the dampers so that the oil can be maintained without risk of dirt entering the damper, and as the reliability of the riding qualities of the car is of the utmost importance this scheme, which can be combined with a damper control, should have attention.

It would seem however that each damper would have to have a twin pipe, but these need not only be 1/16" bore. They could be led to the dash or under the bonnet so that the changeover and replenishing could be easily performed without soiling one's hands.

R.{Sir Henry Royce}
  
  


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