译文：
气动阀：借助压缩空气驱动的阀门。 气动阀采购时只明确规格、类别、工压就满足采购要求的作法，在当前市场经济环境里是不完善的。因为气动阀制造厂家为了产品的竞争，各自均在气动阀统一设计的构思下，进行不同的创新，形成了各自的企业标准及产品个性。因此在气动阀采购时较详尽的提出技术要求，与厂家协调取得共识，作为气动阀采购合同的附件是十分必要的。 1.通用要求 　　1.1气动阀规格及类别，应符合管道设计文件的要求。 　　1.2气动阀的型号应注明依据的国标编号要求。若是企业标准，应注明型号的相关说明。 　　1.3气动阀工作压力，要求≥管道的工作压力，在不影响价格的前提下，阀门可承受的工压应大于管道实际的工压；气动阀关闭状况下的任何一侧应能承受1.1倍阀门工压值而不渗漏；阀门开启状况下，阀体应能承受二倍阀门工压的要求。 　　1.4气动阀制造标准，应说明依据的国标编号，若是企业标准，采购合同上应附企业文件。 　　2.气动阀标质 2.1阀体材质，应以球墨铸铁为主，并注明牌号及铸铁实际的物理化学检测数据。 　 2.2阀杆材质，力求不锈钢阀杆（2CR13），大口径阀门也应是不锈钢嵌包的阀杆。 　　2.3螺母材质，采用铸铝黄铜或铸铝青铜，且硬度与强度均大于阀杆。 　　2.4阀杆衬套材质，其硬度与强度均应不大于阀杆，且在水浸泡状况下与阀杆、阀体不形成电化学腐蚀。 　　2.5密封面的材质 　　①气动阀类别不一，密封方式及材质要求不一； 　　②普通楔式闸阀，铜环的材质、固定方式、研磨方式均应说明； 　　③软密封闸阀，阀板衬胶材料的物理化学及卫生检测数据； 　　④蝶阀应标明阀体上密封面材质及蝶板上密封面材质；它们的物理化学检测数据，特别是橡胶的卫生要求、抗老化性能、耐磨性能；通常采用丁腈橡胶?叭冶鸾旱龋辖粲迷偕骸? 　　2.6阀轴填料 　　①由于管网中的气动阀，通常是启闭不频繁的，要求填料在数年内不活动，填料亦不老化，长期保持密封效果； 　　②阀轴填料亦应在承受频繁启闭时，密封效果的良好性； 　　③鉴于上述要求，阀轴填料力求终身不换或十多年不更换； 　　④填料若需更换，气动阀设计应考虑能有水压的状况下更换的措施。 　　3.变速传动箱 3.1箱体材质及内外防腐要求与阀体原则一致。 3.2箱体应有密封措施，箱体组装后能承受3米水柱状况的浸泡。 　　3.3箱体上的启闭限位装置，其调节螺帽应在箱体内或设在箱外，但需专用工具才可作业。 　　3.4传动结构设计合理，启闭时只能带动阀轴旋转，不使其上下窜动，传动部件咬合适度，不产生带负荷启闭时分离打滑。 　　3.5变速传动箱体与阀轴密封处不可连接成无泄漏的整体，否则应有可靠的防串漏措施。 　　3.6箱体内无杂物，齿轮咬合部位应有润滑脂保护。 　　4.气动阀的操作机构 　　4.1气动阀操作时的启闭方向，一律应顺时针关闭。

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原文：
Pneumatic valve: the valve with compressed air drive. Only clear when the pneumatic valve procurement specifications, type, working pressure to meet the procurement requirements of the practice, in the current environment of market economy is incomplete. Because the pneumatic valve manufacturer for the product competition, each are in the pneumatic valve under the concept of unified design, with different innovations, forming their own corporate standards and product personality. Therefore, pneumatic valve procurement made a more detailed technical requirements, coordinating with manufacturers to reach a consensus, as the pneumatic valve procurement annex to the contract is necessary. 1. General requirements 1.1 specifications and types of pneumatic valves, piping design documents should be consistent with the requirements. 1.2 Pneumatic valves should be specified based on the model national standard code requirements. If the enterprise standards, identifying types of instructions. 1.3 Pneumatic valve working pressure ≥ pipeline working pressure, without the premise of price, the valve can withstand the working pressure should be greater than the actual working pressure pipelines; 气动 valve closed position, or any side should be able to withstand 1.1 times the value of the valve working pressure without leakage; valve open position, the valve should be able to withstand twice the working pressure valve requirements. 1.4 Pneumatic valve manufacturing standards, we should explain the basis of national standard number, if the enterprise standards, procurement contracts should be attached to business documents. 2. 2.1 quality standard pneumatic valve body material should be ductile iron main, and indicate the grade and the actual physical and chemical testing of cast iron data. 2.2 stem material, and strive to stainless steel stem (2CR13), large diameter valves also should be embedded in the package of stainless steel valve stem. 2.3 nut material, brass or cast aluminum with cast aluminum bronze, and the hardness and strength are greater than the valve stem. 2.4 stem bushing material, the hardness and strength shall be not greater than the stem, and is immersed in water conditions and valve body is not the formation of electrochemical corrosion. 2.5 ① sealing surface of the material categories of different pneumatic valve, sealing methods and materials requirements vary; ② ordinary wedge gate valve, copper ring materials, fixation methods, polishing should note; ③ soft seal gate valve, valve plate lining plastic materials, physical chemistry and health testing data; ④ valve sealing surface should be marked on the body sealing surface materials and butterfly board material; their physical and chemical test data, especially rubber, health requirements, aging resistance, wear resistance ; usually NBR? pit   Ye  Luan dry caries  jurisdiction  Can fans kai  skeletal? 2.6 ① As the valve shaft filling pipe network in the pneumatic valve, normally open and close do not frequent, requiring the filling in a few years no activity, no Filler aging, long-term effects remain sealed; ② fill valve shaft should also bear the frequent opening and closing, the sealing effect of the good nature; ③ light of the above requirements, fill valve shaft does not seek to change or 10 years of life do not change; ④ For replacement of packing, pneumatic valve design should be considered to have water pressure conditions change measures. 3. 3.1 speed gear box and outside box materials and corrosion requirements be consistent with the body. Should be sealed box measures 3.2, cabinet assembly can withstand the 3 m water column after the state of immersion. 3.3 box on the opening and closing stopper, and the adjustment nut should be in cabinets or located in the outside box, but special tools need to be working. 3.4 Drive structural design is reasonable, open and close valves can only drive shaft rotation, so as not to traverse up and down, bite moderate transmission parts, does not produce open and close with a load when the separation skid. 3.5 Transmission Box Office with the valve shaft seal leak is not connected whole, otherwise the string should be a reliable anti-leakage measures. 3.6 cabinets without debris, grease should be protection gear Biting. 4. Pneumatic valve pneumatic valve operation 4.1 operating mechanism when the opening and closing direction, all should be clockwise closing.