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    DD series of electric-controlled hydraulic servo-valves is the key control equipment of Nature Master's music fountains. It obtained patent in 1988 with the number of 88103619.6. With a drive power of only 30 kilo watt, water as its direct conductor and diameters ranging from 0.01 inch to 6 inch, its responding speed can be as quick as 0.01 seconds under the pressure of 0.05--.6MPa, producing many unique dynamic water patterns. Being able to endure serious pollution, it can be used as the most stable equipment in rivers, lakes, sea and other man-made water areas. Its high quality is unique in the field.