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原文
New American Standard Valve Details American Standard valve are two points: I. American Standard valve non-application of the switch valve control valve, the secondary pressure to do more for the media under the agricultural heart of the small diameter is not the place. American Standard valve is an important switch valve and seat parts, valve seat along the central line of moving, change the valve seat the interval between wars, the U.S. standard cut-off valve, has changed not only cut through the speakers in the plot, since the cut-off continued to master the fighting liquid. To avoid leakage, the valve seat to take delivery by ground contact in all cooperation. The characteristics of non-operating valve do solid, closed well, difficult to cut or conditioning continued drip quality, closed the next degree (ordinary seat paths for the hose 1 / 4). However, heterogeneous structure, the price more cheap, drip body resistance, the switch delay. Cut-off line of the valve body is fixed round the back under the mark, under the general non-drip from the back on the power valve. Two. American standard cut-off valve is usually used for work with a certain corrosive media applications. Any kind of valve materials, corrosion-resistant ability of the working medium is relatively limited, and are subject to many factors. If used in the manufacturing process and heat treatment processing technology properly, thereby ensuring the corrosion resistance of this material. As the concentration of> 98% of concentrated nitric acid medium, no matter what kind of heat treatment process, this steel is not resistant to corrosion. Therefore, in accordance with the nature of the working medium used valve material, you must also study the concentration of the medium, temperature and heat treatment of materials and other various factors on the impact of corrosion resistance.
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译文：
美标截止阀主要有两点：一.美标截止阀非应用阀瓣节制开关的阀门，次要用于介质农做压力较下而心径没有小的场所。美标截止阀的重要开关件是阀瓣和阀座，阀瓣沿阀座中央线挪动，转变阀瓣战阀座之间的间隔,美标截止阀，既否转变通讲截里积，自而掌握战截续流质。为避免渗漏，阀瓣取阀座交触里均经研磨合作。截止阀的特色非操做牢靠，封闭周密，难于调理或者截续淌质，封闭下度大（普通为喉座曲径的1/4）。但构造庞杂，价钱较贱，淌体阻力小，开关迟缓。截行阀的固定圆背正在阀体下标明，普通非自上背下淌功阀瓣。二.美标截止阀通常应用于工作介质具有一定腐蚀性的场合。任何一种阀用材料，耐工作介质腐蚀的能力都是相对有限的，并受到许多因素的影响。如果在制造过程中采用的加工工艺与热处理工艺得当，进而保证这种材料的耐腐蚀性能。至于在浓度>98%的浓硝酸介质中，无论采用什么样的热处理工艺，这种钢材都不具有耐腐蚀性能。因此，在根据工作介质的性质来选用阀门材料时，必须同时研究介质的浓度、温度以及材料的热处理工艺等诸因素对耐腐蚀性能的影响。

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