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原文：
Commonly used in rough machining with castings, Gate Valves forgings, profiles and welding parts. Different types and rough rough precision, roughness and hardness of the machining process has a direct impact. Select Valve blank following factors should be considered: on the website to play the role of trade, industry information to inform the work of ⑴ parts of the materials and the organization of materials and performance Globe Valves requirements: design of parts on the material provided, largely determines the type of blank. For example, the part material is cast iron, cast method must be used to make rough. For steel parts, should be considered in the choice of rough mechanical performance requirements. For example, the manufacturePlug Valves of high-pressure valve components should generally try to use forged or welded to ensure the material has good mechanical properties. ⑵ parts of the structure of the shape and form factor: part of the structure and shape are important factors affecting choice of blank, for example, the shape of a complex body structure Forged Steel Valves should try to use casting. Large body size can be used in sand casting; size is small, with casting. ⑶ production program size: the greater part of the production program, with high precision and efficient as possible economic effects of blank manufacturing methods. ⑷ blank manufacturing conditions: the equipment should be based on site Needle Valves conditions and level of technology to select the blank, and to consider prospects for the gradual development of advanced manufacturing methods blank.
原文来自： http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/187726-egr-valve.html

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译文：选择阀门毛坯的注意事项以及方法
机械加工常用的毛坯有铸件、锻件、型材及焊接件。不同的调节阀毛坯种类及毛坯的精度、粗糙度和硬度等对机械加工工艺过程有着直接的影响。选择阀门毛坯时应考虑如下的一些因素：关于发挥行业网站作用、推进行业信息工作的通知　　⑴零件的材料及对材料的组织和性能要求:设计图上规定的零件材料，大体上就决定了截止阀毛坯的种类。例如，零件材料为铸铁就必须用铸造方法来制造毛坯。对于钢制零件，在止回阀选择毛坯时应考虑材料的力学性能要求。例如，制造高压阀门的零件一般应尽量选用锻件或焊接件，以保证材料具有良好的力学性能。　　⑵零件的结构形状和外形尺寸:零件的结构形状是影响毛坯选择的重要因素，例如，结构水力控制阀形状复杂的阀体应尽量选用铸件。尺寸大的阀体可选用砂型铸造；尺寸安全阀小的则采用熔模铸造。　　⑶生产纲领的大小:零件的生产纲领愈大，采用高精度和闸阀高效率的毛坯制造方法经济效果愈好。　　⑷毛坯制造的条件:应根据现场的设备状况和工艺水平来选择毛坯，并考虑发展前景逐步采用先进的毛坯制造方法。

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