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).
Valve sticking due to unbalanced pressure and a proposed solution.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan275 | |
| Date | 17th September 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.L. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/AR/LG17.9.25. belief that the valve had been changed right over. Sticking is believed to be due to the unbalanced pressure on the valve - 40 lbs/sq.in when in the mid-position - and the small bearing surface provided on the top of the valve to deal with this pressure. On the side opposite to where the pressure is applied, bearing surface is only provided at the front end of the valve (see Fig lVa). Pressure on the underside tends therefore to tilt the valve in its seat and binding occurs. A method suggested of dealing with this trouble is to provide a ring of metal at the back end of the valve to give additional bearing surface. (see Fig.lVb.) Hs{Lord Ernest Hives - Chair}/AR. | ||