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).
Diagram showing the layout and operation of a Jackall pressure pump valve.
| Identifier | ExFiles\Box 101\4\ scan0118 | |
| Date | 21th October 1935 guessed | |
| JACKALL PRESSURE PUMP VALVE LAY-OUT RETAINING SPRING RELEASE CONTROL KNOB & SCREW VALVE OPERATING RODS FLEXIBLE RUBBER VALVE RETAINER METAL VALVES VULCANIZED IN RUBBER VALVE OPERATING REAR JACKS RELEASE VALVE VALVE OPERATING FRONT JACKS CAM. CONTROL VALVE OPERATING CAM WITH THE RELEASE CONTROL SCREWED RIGHT DOWN, THE CAM. CONTROL IS TURNED TO THE POSITION OF THE REQUIRED JACKS. IMMEDIATELY THE CAM MAKES CONTACT WITH THE VALVE CONTROL ROD, THE FLEXIBLE RUBBER VALVE RETAINER DISTORTS ALLOWING THE VALVE TO COME DOWN ON TO ITS SEATING. | ||