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 incorrect setting of PH.III radiator steam valves on production and a proposed new pressure testing method.
| Identifier | ExFiles\Box 94\3\ scan0194 | |
| Date | 30th April 1937 | |
| 340. To RHC.{R. H. Coverley - Production Engineer} from Rm{William Robotham - Chief Engineer}/Std. c. to By.{R.W. Bailey - Chief Engineer} Rm{William Robotham - Chief Engineer}/Std.9/AP.30.4.37 SETTING OF PH.III. RADIATOR STEAM VALVES ON PRODUCTION. We have observed that the above mentioned valves are not being correctly set on Production - the present setting being approximately .010" initial compression of diaphragm, whereas as a rule .050 initial compression is the average required to give the correct blow off pressure of 2 1/4 lbs/sq.in. In view of this we have carried out some tests in this Department with six standard diaphragms taken off Production, and find that as indicated in separate report HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth}1/VS.{J. Vickers}29.4.37 the required initial compressions vary from .010 to .075. In view of this, the valve can only be set accurately by pressure test and we suggest that this method should be adopted as soon as possible, the blow off pressure being 2 1/2 lbs. sq/in. ± 1/4 lbs/sq.in. The setting of this valve is important since it effects water loss and also the air temperature at which boiling occurs. Rm{William Robotham - Chief Engineer}/Std. | ||