原文：
1根据使用场所、用途，且了解有关法规、规格、标准、方针、许用认可后既可选用适合各种要求的阀门； 2 确认阀门的工作条件、适用介质、工作压力、介质温度； 3确定与管道相匹配的公称通径：DN(mm)； 4 确定与管道相连接方式：法兰式、内(外)螺纹式、焊接式、对夹式、卡箍式、卡套式等； 5 确定阀门的操作方式：手动、蜗轮动、气动、电动、液动、电磁动、电液动等； 6 确认阀门的类型：闸阀、截止阀、节流阀、柱塞阀、球阀、蝶阀、隔膜阀、旋塞阀、止回阀、安全阀、疏水阀、减压阀及其它特种阀； 7 确定阀门的使用形式：开关型、调节型、安全型等； 8 确定阀门壳体及内件的材料：灰铁、球铁、碳钢、合金钢、不锈钢、铜合金、铝合金、塑料等； 9 确定阀门的密封性能要求、密封等级或密封泄漏量； 10 确定阀门的防护涂层要求、包装要求、运输要求； 11． 特殊需要的阀门还应确定：结构长度、阀门高度、外型尺寸、流阻、排放能力、流量特性、防护等级、防爆性能等参数； 12． 确定阀门的安装位置及姿势。

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译文：
1 According to the site of use, purpose, and understand the relevant laws and regulations, specifications, standards, guidelines, allowable can use for a variety of post-approval requirements of the valve; 2 confirm that the working conditions of the valve, for media, working pressure, medium temperature; 3 identify and match the nominal pipe diameter: DN (mm); 4 to determine ways and pipelines connected: flange, and internal (external) threaded, welded, wafer type, clamp type, sleeve style, etc.; 5 to determine the valve's operating modes: manual, worm gear, pneumatic, electric, hydraulic, electromagnetic action, such as electric hydraulic; 6 confirm the type of valve: gate valve, globe valve, throttle valve, plunger valve, ball valve, butterfly valve, diaphragm valves, plug valves, check valves, safety valves, steam traps, pressure reducing valve and other special valves ; 7 to determine the use of the valve forms: switching to regulate the type, security type, etc.; 8 determine the valve casing and the inner parts of material: gray iron, ductile iron, carbon steel, alloy steel, stainless steel, copper alloy, aluminum, plastic, etc.; 9 determine the performance requirements of the valve seal, seal, or seal leakage level; 10 to determine the valve's protective coating requirements, packaging requirements, transportation requirements; 11. Valves should also identify the special needs: the length structure, valve height, shape size, flow resistance, discharge capacity, flow characteristics, degree of protection, explosion-proof performance parameters; 12. Determine the valve installation position and posture. Source: China Environment Protection Equipment Exhibition Net