The LV-4 is commonly used in release printing. The standard light point range is LP76 to LP0. Time from full open to full close of the valves is 2 milliseconds; this means that while printing at 2000 feet per minute, light changes can be made only on the frame line. Fully closed, the valve only transmits 1.0% of the light.
The model LV-4 light valve is identical to the LV-6 in size and shape.
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