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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).
Recommendation for the production specifications of Ph.III radiator steam valve diaphragms.

Identifier  ExFiles\Box 94\3\  scan0043
Date  14th March 1936
  
To E.{Mr Elliott - Chief Engineer}
C. to By.{R.W. Bailey - Chief Engineer}
C. to Sit.
C. to Roy.{Sir Henry Royce}

X340

Hs{Lord Ernest Hives - Chair}/Std/9/JH.14.3.36.

Ph.III Radiator Steam Valve-Lec.4600.

We recommend that diaphragms for these valves on production should be the same as the last ones supplied to us by Mr. Dolman of the G.C. i.e., made complete to production drawings by the Stainless Spinning Works of Birmingham, however a note should be added to the diaphragm assembly drawing indicating that the dimensions of the diaphragm in the free position etc. should be strictly adhered to, and that the minimum movement of the diaphragm without permanent set, should be 0.110".
The stainless steel valve and seating on valve outlet should be lapped together to give a good seating and the valve outlet should be of such a length that the initial deflection of the diaphragm is .070". The most convenient way of doing this is by means of washers of various thicknesses beneath the valve outlet.

Finally, the valve should be set by means of the adjustment on the spring loading to commence to blow at 2.5 - 3.0 lbs/sq.in.

We suggest that this is done by subjecting the radiator to air pressure and using a pressure gauge.

HS{Lord Ernest Hives - Chair}/Std.
  
  


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