译文：
　氟塑料衬里蝶阀的设计技巧： 1、概述： 随着现代石油化工工业的快速发展,在特殊工况中使用的一些介质具有极强的腐蚀性,即使是不锈钢阀门及衬橡胶、搪瓷的阀门也已不能满足需要。若采用哈氏合金、蒙乃尔合金或20号合金等作为阀门材料,由于其中含有大量的Ni、Cr、Ti、Mo、Nb和Pt等稀有金属,其资源有限,价格贵。根据现代科学技术成果,氟塑料分子结构中有氟碳键及其屏蔽效应,具有优良的耐腐蚀性、耐高(低)温性、不粘附性和电绝缘性,几乎能xx所有化学介质(包括氢氟酸、浓硫酸和王水)的腐蚀。利用氟塑料的可塑性加工原理,将氟塑料衬于普通的钢铁外壳体内,以隔绝钢铁金属与强腐蚀性介质的直接接触,既解决了氟塑料强度低和不能承受高压力的问题,又解决了钢铁材料不耐腐蚀的问题。氟塑料衬里阀门具有优良的耐热性和耐寒性,具有优良的电绝缘性和优异的化学稳定性,可耐各种强酸、强碱和强氧化剂的腐蚀, 低摩擦性和自润滑性非常好, 可长期在- 195～200℃范围内使用。 2、结构与设计 2.2、适用范围 氟塑料衬里蝶阀公称压力为PN116 (氟塑料的承受压力{zg}可达到215MPa) 。DN50～1 200。阀门适用温度按所选用的不同材料(金属材料和非金属材料)能承受的温度综合评定。如钢制衬氟塑料(WCB + F46)材料,使用温度为- 29～150℃。限定{zg}值不超过150℃。适用介质为低粘度酸和碱类等腐蚀性介质,主要指酸性、碱性、有机和无机溶剂等强腐蚀性介质。低粘度是相对浓度较高的颗粒状介质而言,氟塑料衬里阀门应尽量避免使用固体颗粒的介质。 3.3、测试方法 (1) 温度 试验温度测量涉及室温至液氮温度区范围, 采用热电偶温度计测量, 温度电信号通过数字多用表测量、采集并输入测控计算机, 在计算机界面上显示, 并由计算机自动完成记录和保存。与此同时,计算机将温度测量值输送到仪表面板上的温度显示仪进行现场显示。 2) 压力 试验压力测量范围为0～10M Pa。采用指针式精密压力表和数字式压力表在仪表面板上对系统压力进行现场显示, 同时, 采用压力变送器测量系统压力, 并转换为电压信号, 经数字多用表测量、采集并输入测控计算机, 在计算机界面上显示, 并由计算机自动完成记录和保存。 (3) 液位 为了确保液氮液面高度满足阀门测试的要求,采用差压式压力变送器测量液位高度。测量电信号通过数字多用表测量、采集并输入到计算机进行显示, 并提醒加注液氮和停止液氮加注操作。 (4) 流量 根据阀门密封形式的不同, 阀门的允许泄漏量是不同的。软密封结构的阀门, 其泄漏量应该为零。而对于硬密封的阀门, 本身是允许有一定泄漏量的。基于上述情况, 配备两种测量流量的装置,其一是小流量的流量计, 用来测量允许具有一定泄漏量的硬密封阀门或者软密封阀门在相对不正常工作状态下时的泄漏情况。 对于微小泄漏量, 由于一般的流量计已经无法检测到, 需通过观察并计数开口端在水中泄漏气泡数的形式进行测量。利用计算机数据采集系统记录电脉冲的数目, 实现自动计数。 4、结语 基于计算机数据采集系统的低温阀门性能测试装置, 可以把热电偶、压力传感器、液位传感器和流量计的各路信号, 经前置处理后输入到计算机中, 通过数据采集软件进行数据显示、存储和打印, 还可根据相关参数的设置来控制液氮罐的自增压系统对低温试验槽进行加注液氮。该测试系统采用集中式数据监控, 既实现了通过计算机发出指令进行自动操作, 提高工作效率、操作的及时性、准确性及安全性, 又便于数据的统一保存和管理。

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原文：
Fluorine plastic lined butterfly valve design techniques: 1, Overview: With modern rapid development of petrochemical industry, in particular the use of some of the conditions are extremely corrosive media, even stainless steel valves and lining rubber, ceramic valves have also been unable to meet the needs. If the use of Hastelloy, Monel alloy or alloy 20 as the valve material, as containing a large number of Ni, Cr, Ti, Mo, Nb, and Pt and other precious metals, their resources are limited, expensive. According to modern science and technology achievements in fluorine molecular structure of fluorocarbon plastic keys and the shielding effect, with excellent corrosion resistance, high (low) temperature, non-adhesion and electrical insulation, virtually all chemical media against (including hydrofluoric acid, sulfuric acid and aqua regia) of corrosion. Fluorine plastic processing plasticity theory, the fluorine plastic lined steel shell body in general to isolate iron and steel and strong corrosion of the direct contact, not only solved the intensity of low-fluorine plastic and can not withstand high pressure, has solved Steel corrosion problems impatience. Fluorine plastic lined valves have excellent heat resistance and cold resistance, excellent electrical insulation and excellent chemical stability, resistance to various acids, alkalis and strong oxidizing agents of corrosion, low friction and self-lubrication is , and can be long - 195 ~ 200 ℃ range. 2, Structure and Design 2.2 Scope Fluorine plastic lined butterfly valve nominal pressure PN116 (fluorine plastic pressure can reach 215MPa). DN50 ~ 1 200. Valve for the selected temperature according to the different materials (metal material and non-metallic material) can withstand the temperature of an integrated assessment. Such as steel fluorine plastic (WCB + F46) materials, using the temperature - 29 ~ 150 ℃. Limit the maximum value not exceeding 150 ℃. For medium to low viscosity corrosive acid and alkali and other media, mainly refers to acidic, alkaline, organic and inorganic solvents and other strong corrosive media. Relatively low viscosity is high concentration of granular media, the fluorine plastic lined valve to avoid the use of solid particles of media. 3.3, test methods (1) temperature Test involves measuring the temperature from room temperature to liquid nitrogen temperature zone, measured using thermocouples, temperature signal measured by digital multimeter, collect and input monitoring and control computer, the computer interface on the display by the computer automatically recorded and saved. At the same time, the computer will be transmitted to the instrument temperature measurements of the temperature display instrument panel display on site. 2) pressure Test pressure measurement range of 0 ~ 10M Pa. Analog and digital pressure gauge with precision pressure gauge in the instrument panel display system pressure field, while the pressure measurement system with pressure transducer, and converted to voltage signal measured by the DMM, collect and input monitoring and control computer the computer interface shown by the computer automatically recorded and saved. (3) level In order to ensure a high degree of liquid nitrogen to meet the requirements of valve testing, differential pressure transmitter with high level control. Measurement signals measured by digital multimeter, collected and entered into the computer display, and remind stop filling liquid nitrogen and liquid nitrogen filling operation. (4) flow According to the different forms of valve seal, valve allows leakage is different. Soft sealing valve structure, the leakage should be zero. As for the seal of the valve itself is allowed to have some leakage. Based on the above, the flow measurement device with two, one is a small flow meter, to measure to allow a certain amount of leakage of the valve seal or soft seal valves in the relatively normal working state of the situation when the leak . For the small amount of leakage, due to the general flow meter has not detected, need to open end by observing and counting the number of bubbles in the water leakage in the form of measurement. Using computer data acquisition system records the number of electrical pulses, to achieve automatic counting. 4 Conclusion Computer data acquisition system based on low-temperature valve performance testing device can be thermocouples, pressure sensors, liquid level sensors and flow meter signals from various quarters, after pre-processing and input into the computer by data acquisition software for data , storage and printing, but also according to the setting parameters to control the liquid nitrogen tank from the tank pressurization system for filling liquid nitrogen at low temperature. The test system uses a centralized data monitoring, realized the instructions issued by computer automation, improve efficiency, timeliness of operation, accuracy and security, unified and easy to store and manage data.