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The digital water system for digital water curtain, water screen projection is high-frequency opening and closing by a solenoid valve, and water droplets fall continuously or discontinuously, forming all sorts of images. Our standard digital water curtain has got 56 valves and 112 nozzles every meter. Digital water curtain could display word, figure, or image, and different running effects. The control system could convert the customized images into different control signals to the solenoid valves, then form different words or patterns designed for the water screen projection of a graphical waterfall. So it is also called a graphical waterfall printer.