| Water hydraulic has a growing technology area mainly due to environmental, safety and cleanness.Water hydraulic systems have proved to the best technology alternative in some industrial sectors such as food, paper, steel and power industry. With the development of material science and modern technology, Water hydraulics have been a new study point in and abroad. However, due to low viscidity, high vaporization pressure and erosion of water medium, water hydraulic relief valve face technical difficulties such as erosion, cavitation failure and so on. Along with hydraulic systems developing with high speed, high pressure and micro systems, especially development of water hydraulics, cavitation is more and more outstanding.Designing the pure water relief valve is summarized basing on oil valve in the paper. Besides, the way of designing of water relief valve has been distinguished from the traditional one on the basis of the special properties of pure water.As one of the key components of water hydraulic system, water relief valve plays an important role in water hydraulic system. This paper has carried out analysis on Static and dynamic property of water relief valve and has built pure water flooding valve dynamic behaviour mathematic model. Applying commercial simulation software Matlab and simulink, the dynamic characteristics of water relief valve was numerically investigated With different main parameters.At last, numerical simulation and visualizing research are made on the flow field in water hydraulic valves by applying Fluent in the paper. Through water pressure valve model and the improved model's CFD steady state model and analysis, the pressure distribution, velocity distribution, disorderly flow energy distribution, energy distribution can be obtained. Basing on it, the optimization being in progress designs the Runner structure, which offers the theory foundation for designing water hydraulic valves with the high efficiency, low energy loss and low noise.
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