The material of the Industrial Valves ( 1) of water supply network, the valve body, valve cover, variable speed drive box materials are mostly grey cast iron, and part of nodular cast iron. In view of the popularize the use of nodular cast iron pipes, pipe fittings, valves materials should also be so. To improve the quality of the casting, and reduce the weight of a valve, especially in the valve plate should be used first ball iron ( QT405 - 10) 。 It should be pointed out that, due to the different thickness of each part of the body, the difficulty of casting spheroidizing is larger, should have the corresponding measures to ensure the quality of the casting parts. On the body casting at present still has some problems, such as physical and chemical indicators of ductile iron in addition to the individual manufacturer, most of the control is not strict, and using green sand casting, large mechanical processing molding. Suggest that each manufacturer to establish a strict quality control system for a large number of small and medium caliber valve adopts the method of mold, large diameter valves using resin sand molding, and the casting should be effective measures to eliminate internal stress, promote blasting deoxidization measures. Casting defects, are not allowed to use way to eliminate weld repairs, otherwise measures should be taken to eliminate the internal stress of weld formation, more strict inspection, and introduced the situation to the user. Also learned many valve manufacturer in inspection of casting parts adopt outsourcing solutions, in the form of complementary advantages, outsourcing parts purchase is also a kind of mode of operation, the key is to control the quality of purchasing component to strictly. For purchase of low-quality components, of course, a little decoration, buckle on own label, is sell should stop. ( 2) Proposed the valve stem shall be used 2 cr13 stainless steel material. ( 3) Stem nut recommended aluminum brass or aluminum bronze, and the hardness and strength of the nut is greater than the valve stem. Opening and closing of the valve torque for manual or machine opening and closing of portable, valve open-close torque under pressure at work? 240牛? M, that is, a man that can operation. Hope the valve manufacturer's first optimize the design of the valve structure, improve the component combination of concentricity, the light of the moving parts contact surfaces clean degree, reduce the resistance of opening and closing. If only the variable speed drive box speed ratio, increase the opening and closing of revolution way to reduce the open-close torque is not ideal. For this purpose, machining means the update is not allow to ignore, such as a valve plant in tianjin in order to improve the mechanical and the quality of the work, a large number of machine tools and machining center, equipped with computer program-controlled is commendable. In this paper, the keyword search: more valve product information
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