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原文
The choice of valve diameter Should be based on the known fluid flow rate required to calculate the coefficient of CV, based on product data sheet and then select the appropriate valve diameter. Calculation of CV, we should pay attention to the liquid, gas, steam and other vapors difference. 2 installation of pneumatic control valve membrane Control valve installation should pay special attention to the following points. (1) The control valve should be installed vertically in horizontal pipelines, such as the level required in exceptional circumstances and tilt installation, usually to add support. (2) When the selected control valve nominal diameter and the diameter is not the same process, should be retrofitted with reducer fittings to connect. (3) The installation site should have a better environmental conditions, ambient temperature should be -25 ~ +55 ℃. (4) mounted on a vibration source to avoid the occasion, or shall take the necessary reinforcement of anti-vibration measures. (5) installation, you must make the valve or flange on the direction of the arrow point to the media. (6) installation, you need to carefully remove the pipe welding slag and other debris; in the installation, you should make the biggest opening in the valve, and piping and valves clean again, to prevent debris stuck and damage the section flow conditions. (7) pneumatic control valve should be installed in the ease of maintenance, repair location. (8) of straight pipe before the valve should be as long as possible. (9) exit piping applications 3 to 5 times the pipe diameter of straight pipe. (10) In order to ensure that the control valve and control system failure will not affect the production and security incidents, generally need to install the bypass and the bypass valve. Bypass valve can not be installed just above the valve, the bypass valve to prevent leakage of corrosive media to the regulating valve. Control valve before and after the cut-off valve must be installed for high-temperature, high pressure, easy to freeze, viscous media, but also install shower valve guide.
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是由上海丰企阀门有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：

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译文：
应根据已知的流体计算出所要求的流量系数CV，再根据产品技术参数表选取合适的调节阀口径。计算CV时，要注意液体、气体、水蒸气和其它蒸气的区别。 2　气动薄膜调节阀的安装安装调节阀时应该特别注意以下几点。（1）调节阀应垂直安装在水平管道上，如在特殊情况下需要水平和倾斜安装时，一般要加支撑。（2）当选定调节阀的公称通径与工艺管径不同时，应加装异径接头进行连接。（3）安装场地应有较好的环境条件，环境温度应在-25～+55℃。（4）尽量避免安装在有振源的场合，否则应采取必要的防振加固措施。（5）安装时，必须使阀体上或法兰上的箭头方向指向介质方向。（6）安装前，需要认真清除管道内焊渣和其它杂物；在安装后，应使阀芯处于最大开度，并对管道和调节阀再次进行清洗，以防杂物卡住和损伤节流件。（7）气动调节阀应安装在便于维护、修理的位置。（8）阀前直管段应尽可能长。（9）出口配管应用3～5倍管道直径的直管段。（10）为了确保调节阀和调节系统出现故障时不致影响生产和发生安全事故，一般都需要安装旁路和旁路阀。旁路阀不能安装在调节阀的正上方，以免旁路阀内腐蚀性介质泄漏至调节阀上。调节阀前、后需安装截止阀，对于高温、高压、易冻、黏稠介质，还要安装导淋阀。

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