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).
Notice detailing a noise issue with hydraulic shock absorbers caused by the replenishing ball valves.
| Identifier | ExFiles\Box 16\5\ Scan011 | |
| Date | 11th August 1931 | |
| COPY. y7520. To Hd.{Mr Hayward/Mr Huddy} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} (For Depot Sheet). Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/AD11.8.31. HYDRAULIC SHOCK ABSORBERS. X.235. X.7520. A shock absorber noise has been traced to the replenishing ball valves. In certain cases these small balls hammer themselves on to their seats until the seat corresponds to the radius of the curvature of the ball, or in extreme cases tends to form a cylinder. Under these conditions the replenishing action of the ball is delayed as it is reluctant to leave its seat. The easiest way to detect this trouble is to move the shock absorber arm very rapidly for three or four inches in one direction and then suddenly reverse the load. If these replenishing balls are not seating properly there may be as much as 2" loss of movement. Owing to the greater load the trouble is more prevalent at the high pressure end than at the low pressure end. To rectify the damper, the replenishing ball valve seats should be recut and a small cutter has been designed for the purpose its number being HB.{C. E. Harcombe}264 F.74795. It is advisable to dismantle the damper when re-cutting these seats to avoid aluminium chippings getting in the system. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||