| 摘要 |
The disclosed system controls, through novel pressure and valving adjustment mechanisms, the application of dampening fluid to the ink roll or offset plate on the plate cylinder of an offset printing press. The dampening fluid passes through a pressure compensator which adjusts the fluid pressure in response to changes in the speed of the press. The fluid at the adjusted pressure is then directed to a spray bar, where it is discharged through a plurality of nozzles. The fluid is directed to the spray bar by a multiple valve, page control assembly. In the page control assembly fluid from a common manifold is discharged through a plurality of dual control valves to respective nozzles. Closure elements for the respective valves are operated by air pistons. A plurality of needle elements for the respective valves are axially adjusted by a common manual control so that adjusting the manual control adjusts the amount of fluid from one segment of the spray bar, preferably corresponding to a full page.
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