Many large-scale desalination project is domestic construction. In this paper, from the media, the material, the anticorrosive processing, structure and installation requirements and other aspects, analysis of seawater desalination project engineering design process of the valve in the process of selection. Process medium desalination process, the need to pay special attention to chloride corrosion of equipment. In addition, the water temperature had a great influence on corrosion rate, the higher the temperature, the faster the corrosion. Protective film and solid pollutants can damage the material, cause erosion. All kinds of chemical pollutants will also increase the probability of corrosion. Ingredients additive may be a human sea chemical pollutants, but from the perspective of the corrosion amount will not cause any problems. Such as sodium hypochlorite is sometimes used to restrain algae, but too much doses can cause serious corrosion. Has a variety of desalination technology, of which the main technological process of reverse osmosis technology for water of the sea water to pretreatment, ultrafiltration, reverse osmosis and product water ( By-product reverse osmosis thick liquid) Main medium, the process of composition are shown in table 1 ( The location of different composition differences) 。 material in seawater desalination project, many problems appeared in the valve material flow components. At present, the commonly used material flow components are mainly nickel aluminum bronze, stainless steel, duplex stainless steel and metal coatings, etc. type rational choose the type of valve, can reduce material consumption, reduce the local resistance and energy consumption, convenient installation, reduce maintenance. This paper mainly discusses the choice of large diameter cut off valve and check valve. Shut-off valve in the large-scale desalination process pipe diameter is 12 ~ 1600 commonly, is beyond the scope of ball valve and globe valve commonly used. Butterfly Industrial Valves and gate valve (same size Z41H) Compared with simple structure, easy to corrosion, the installation length is short, low steel consumption, the advantages of the local resistance coefficient of valve close butterfly valve is chosen as the cut-off valve is more economical and practical. According to the stress level, butterfly valve can be divided into low pressure and high pressure butterfly valve.
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