Corrosion has always been a difficult problem in automatic control instruments, and the harm is very serious. Therefore, some automatic systems have to be changed to manual, and corroded instruments and equipment have to be replaced frequently. Therefore, corrosion resistance has always been a concern of domestic and foreign manufacturers and design institutes.

一、耐腐蚀材料

1、 Corrosion resistant materials

(1)橡胶有一定的耐腐蚀性，而且便宜。因此在温度不高的情况下被广泛地用在耐腐蚀设备的调节阀上，五、六十年代便产生出了衬橡胶的隔膜阀。为调节大流量的腐蚀介质，进而又产生了衬胶蝶阀。但橡胶并不完全耐腐蚀，且使用温度，耐压条件受到一定的限制。

(1) Rubber has certain corrosion resistance and is cheap. Therefore, it is widely used in regulating valves of corrosion resistant equipment under low temperature. In the 1950s and 1960s, rubber lined diaphragm valves were produced. In order to regulate the corrosive medium with large flow, a rubber lined butterfly valve is produced. However, the rubber is not completely corrosion resistant, and the use temperature and pressure conditions are limited.

(2)聚四氟乙烯(外文简称为F4、PTFE)，是当今好的耐腐蚀材料，被称为“耐腐蚀”。它具有非常优良的耐蚀和耐热性能，可在-250～250℃温度内长期使用。除在高温高压下氟元素和熔融状态的碱金属对它有腐蚀作用，某些卤化物或芳香烃使其有轻微的膨胀外，其它诸如强酸(包括浓硝酸和水)、强碱、强氧化剂、油脂、酮、醚、醇等即使在高温下也对它不起作用。它几乎可以抵抗所有化学介质而不受其腐蚀。

(2) Polytetrafluoroethylene (F4, PTFE for short in foreign languages) is a good corrosion resistant material today, known as the "king of corrosion resistance". It has excellent corrosion resistance and heat resistance, and can be used for a long time at - 250~250 ℃. Except that fluoride and molten alkali metal corrode it under high temperature and pressure, and some halides or aromatic hydrocarbons cause slight expansion, other strong acids (including concentrated nitric acid and aqua regia), strong alkalis, strong oxidants, oils, ketones, ethers, alcohols, etc. do not affect it even under high temperature. It can resist almost all chemical media without being corroded.

(3)聚四氟乙丙烯是一种耐腐蚀、耐温性能更好的新型材料，具有高度的化学稳定性和优良的耐化学腐蚀力,如耐强酸、强碱、强氧化剂等。它还有突出的耐热、耐寒性，可长期使用在温度-00～250℃环境下；同时，还有不粘连、不吸水、不燃烧等特点。此外，该材料具有较好的流动性，可内衬于部件表面作为耐腐蚀材料使用。

(3) Polytetrafluoroethylene propylene is a new material with better corrosion resistance and temperature resistance, which has high chemical stability and excellent chemical corrosion resistance, such as strong acid, strong alkali, strong oxidant, etc. It also has outstanding heat resistance and cold resistance, and can be used for a long time under the temperature of - 00~250 ℃; At the same time, there are no adhesion, no water absorption, no combustion and other characteristics. In addition, the material has good fluidity and can be lined on the surface of components as a corrosion resistant material.

(4)早在二三十年代，国外便有耐蚀合金如哈氏合金、蒙乃尔合金，而国内五六十年代才起步。把耐腐蚀合金用在调节阀领域是从八十年代开始的，但因耐腐蚀合金太贵而无法被广泛推广使用。

(4) As early as the 1920s and 1930s, there were corrosion resistant alloys such as Hastelloy and Monel abroad, but in the 1950s and 1960s, they started in China. The use of corrosion-resistant alloys in the field of control valves began in the 1980s, but the price of corrosion-resistant alloys is too expensive to be widely used.

二、耐腐蚀阀系列

2、 Corrosion resistant valve series

(1)全四氟耐蚀单座调节阀

(1) Full tetrafluoro corrosion resistant single seat regulating valve

全四氟耐腐蚀单座调节阀采用金属外壳与聚四氟乙烯镶嵌的结构形式。金属外壳一般用碳钢或不锈钢，阀体内部与介质接触的部分(容腔、通道、节流件等)全部采用聚四氟乙烯，将阀体材料与腐蚀性介质隔离开来，从而使腐蚀性问题得到了较好的，尤其是在硫酸、盐酸、湿氯气等介质中使用效果尤为突出。该产品于92年获得了。

The metal shell and PTFE inlaid structure form are adopted for the all PTFE corrosion resistant single seat regulating valve. The metal shell is generally made of carbon steel or stainless steel. The parts inside the valve body that are in contact with the medium (chamber, channel, throttle parts, etc.) are all made of PTFE, which separates the valve body material from the corrosive medium, so that the corrosive problem can be solved better, especially in sulfuric acid, hydrochloric acid, wet chlorine and other media. This product obtained the national patent in 92.

(2)衬氟O型球阀

(2) Fluorine lined O-ring ball valve

衬氟球阀又称水处理专用球阀，主要用于强碱、水处理(脱盐水)的两位控制装置中。它采用内衬氟塑料方式，将耐腐蚀材料内衬于阀体内，保证与各种强腐蚀介质接触的部分均为氟塑料，将腐蚀介质与阀体材料隔离开；在结构上，由于球阀的球芯是一个刚度好、可靠性好的零件，从根本上了过去隔膜阀的隔膜片不可靠的缺陷，提高了阀的可靠性并延长了使用寿命。因此，衬氟球阀是替代隔膜阀的佳产品。

Fluorine lined ball valve, also known as special ball valve for water treatment, is mainly used in the two position control device for strong alkali and water treatment (desalted water). It is lined with fluoroplastics, and the corrosion-resistant materials are lined in the valve body, so as to ensure that the parts contacting with various strong corrosive media are fluoroplastics, which separates the corrosive media from the valve body materials; In terms of structure, the ball core of the ball valve is a part with good rigidity and reliability, which fundamentally solves the problem of unreliable diaphragm of diaphragm valve in the past, improves the reliability of the valve and extends its service life. Therefore, fluorine lined ball valve is a good substitute for diaphragm valve.

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