译文：
随着工业技术的飞跃发展，对阀门行业提出了更严格的要求，尤其对低温介质中所使用的蝶阀，除了能满足一般阀门所具有的性能之外，更重要的是在低温状态下阀门密封的可靠性，动作的灵活性以及对低温阀门的一些其它特殊要求。随着工业技术的飞跃发展，对阀门行业提出了更严格的要求，尤其对低温介质中所使用的蝶阀，除了能满足一般阀门所具有的性能之外，更重要的是在低温状态下阀门密封的可靠性，动作的灵活性以及对低温阀门的一些其它特殊要求。 　　众所周知，蝶阀具有结构紧凑、体积小、重量轻(与相同压力，相同通径的闸阀相比可减轻40％～50％)流体阻力小、启闭迅速等一系列优点。但我国一些低温装置如天燃液化设备、空气分离设备以及变压吸附设备等化工行业所采用的阀门有80％以上是截止阀或闸阀，采用蝶阀的数量很少。分析其原因主要是过的金属密封蝶阀在低温状况下密封性能不良，以及其它一些因结构不合理等原因造成介质内漏和外漏，严重的影响这些低温设备的安全和正常运行，不能满足低温设备的要求。 　　根据我国低温装置的不断发展，对低温阀门的要求日益增大，为适应市场经济发展的需要，对金属密封蝶阀进行结构上的改进，研制出一种三偏心纯金属高密封性能的蝶阀(图一、现已申报国家专利)无论介质是高温还是低温均能满足其需要。现结合其结构特点，仅对低温性能方面作简单介绍。 　　一、对低温碟阀密封性能的要求： 　　低温阀门产生泄漏的原因主要有两种情况，一是内漏；二是外漏。 　　1)阀门产生内漏主要原因是密封副在低温状态下产生变形所致。当介质温度下降到使材料产生相变时造成体积变化，使原本研磨精度很高的密封面产生翘曲变形而造成低温密封不良。我们曾对DN250阀门进行低温试验，介质为液氮(-196℃)蝶板材料为1Cr18Ni9Ti(没经过低温处理)发现密封面翘曲变形量达0.12mm左右，这是造成内漏的主要原因。 　　新研制的蝶阀由平面密封改为锥面密封。阀座是一个斜圆锥椭圆密封面，与嵌装在蝶板上的正圆形弹性密封环组成密封副。密封环可在蝶板槽内径向浮动。当阀门关闭时，弹性密封环首先和椭圆密封面的短轴接触，随着阀杆的转动逐渐将密封环向内推，迫使弹性环再和斜圆锥面的长轴接触，最终导致弹性密封环与椭圆密封面全部接触。它的密封是依靠弹性环产生变形而达到的。因此当阀体或蝶板在低温下产生变形时，都会被弹性密封环来吸收补偿，不会产生泄漏和卡死现象。当阀门打开时这一弹性变形立即消失，在启闭过程中基本没有相对磨擦，故使用寿命长。 　　2)阀门的外漏：其一是阀门与管路采用法兰连接方式时，由于连接垫料、连接螺栓、以及连接件在低温下材料之间收缩不同步产生松弛而导至泄漏。因此我们把阀体与管路的连接方式由法兰连接改为焊接结构，避免了低温泄漏。其二是阀杆与填料处的泄漏。一般多数阀门的填料采用F4，因为它的自滑性能好、摩擦系数小(对钢的摩擦系数f=0.05～0.1)，又具有独特的化学稳定性，因此得到广泛应用。但F4也有不足之处，一是冷流倾向大；二是线膨胀系数大，在低温下产生冷缩导致渗漏，造成阀杆处大量结冰，至使阀门开启失灵。为此研制的低温蝶阀采用自缩密封结构即利用F4膨胀系数大的特点，通过予留的间隙达到常温、低温都可以密封的目的。 　　二、阀体、阀杆轴衬的设计要求： 　　1)低温阀门壳体结构形状。材料选择的正确与否对阀门的正常可靠工作有着极其重要的意义。蝶阀的结构特点与截止阀、闸阀相比，不但避免了因形状不规则，壳体壁厚不均匀，在低温下产生的冷缩，温差应力所引起的变形，而且由于蝶阀体积小，阀体形状左右基本是的称的，因而热容量小；予冷量消耗也小；形状规则又便于对阀门的保冷措施。如新研制的DD363H型碟阀为保证阀门在低温下的可靠使用，xx按照低温阀的特殊性进行设计和制造，如：壳体材料选择了具有立方晶格的1Cr18Ni9Ti奥氏体不锈钢等。 　　2)阀杆衬套的选择：根据用户反映，有些低温阀门在运行当中，阀门的转动部位发生粘滞，咬合现象时有发生，主要原因是：配对材料选择不合理，予留冷间隙过小，以及加工精度等原因所致。在研制低温阀门时，采取了一系列措施，防止出现以上现象。例如：我们对阀杆上、下轴衬选用了具有摩擦系数小及自润滑性能的 SF-1型复合轴承，这样可以适用于低温阀门的一些特殊需要。 　　金属密封型蝶阀具有的特点是一些普通阀门所不具备的。尤其是流阻小、密封可靠、启闭迅速、使用寿命长等。本公司研制的三偏心金属密封蝶阀的密封力来自弹性环的变形达到密封，因而不需要借助介质作用力，故可做双向密封用。根据蝶阀的一些特点将会被更多的人所重视。今后也会有更多的蝶阀应用到低温设备中。

“ metal sealing butterfly valve in the application of cryogenic equipment introduction ”是由提供的国际阀门新闻，译文仅供参考。另外，中国蝶阀网还提供相关产品搜索：、、 、、等。

原文：
With the rapid development of industrial technology, for the valve industry, made more stringent requirements, especially for low-temperature media used in the butterfly, in addition to possess to meet the general performance of the valve and, more importantly, in low temperature under the valve seal reliability, flexibility of movement as well as a number of other low-temperature valve special requirements. With the rapid development of industrial technology, for the valve industry, made more stringent requirements, especially for low-temperature media used in the butterfly, in addition to possess to meet the general performance of the valve and, more importantly, in low temperature under the valve seal reliability, flexibility of movement as well as a number of other low-temperature valve special requirements. As we all know, Valve has a compact structure, small size, light weight (with the same pressure, the valve diameter compared to the same reduce the 40% ~ 50%), fluid resistance is small, open and close rapidly and a series of advantages. However, some of China's low-temperature devices such as days of burning liquid equipment, air separation equipment, and pressure swing adsorption equipment, valves used in chemical industry has more than 80% cut-off valve or gate valve, using a small number of butterfly valves. Analyze the main reason is too metal sealing butterfly valve at low temperature sealing performance under adverse conditions, as well as other irrational structure caused by internal leakage and dielectric leakage, serious implications of these low-temperature equipment, safety and normal operation can not meet the cryogenic equipment. According to China's continuous development of low-temperature devices, the requirements for low-temperature valve and increasing the development of market economy to adapt to the needs of the metal sealing butterfly valve structural improvements, developed a three eccentric high-sealing properties of pure metal butterfly valve (Figure 1, has been declared national patent), whether the medium is high or low temperatures can meet their needs. Is combined with its structural characteristics, only the low-temperature performance, make a brief introduction. 1, for low-temperature disc valve sealing performance requirements: Produce low-temperature valve, there are two main reasons for the leakage of the situation, one internal leakage; second is leakage. 1) generated within the valve seal leakage mainly due to the Deputy at low temperatures caused a state of deformation. When the medium temperature dropped to produce the material phase change caused by volume change, so that the original seal with high precision surface grinding produces warpage caused by low-temperature seal bad. We have proposed to DN250 valves for low-temperature test medium is liquid nitrogen (-196 ℃) butterfly plate material 1Cr18Ni9Ti (not subject to low temperature treatment) found that the sealing surface warpage amounted to about 0.12mm, which is the main reason resulting in leakage . The newly developed valve seals replaced by a flat cone seal. Is an oblique elliptical cone seat sealing surface, and embedded board is mounted on butterfly seal ring composed of circular elastic seal pair. Seal ring in radial floating butterfly board tank. When the valve is closed, flexible sealing ring first and the sealing surface of the short axis of contact ellipse, with the stem of the rotating seal ring gradually pushed inward, forcing elastic ring again and the long axis oblique cone surface contact, eventually leading to elastic sealing ring with an oval all contact with sealing surface. It relies on elastic sealing ring deformation and to achieve. So when the butterfly valve or plate deformation at low temperatures, when the seal ring will be flexible to absorb the compensation, will not produce the phenomenon of leakage and choked to death. When the valve opens, the elastic deformation disappear, in the process of basically not open and close relative friction, so long service life. 2) The leakage of the valve: one is the use of valves and pipe flange connections, because connections litter, connecting bolts, and connectors under the material at low temperatures are not synchronized between the contraction and relaxation lead to a leak generated. So we put body in connection with the pipeline replaced by a flange welded structure, avoiding the low-temperature leakage. The second is the stem and the packing at the leakage. In general the majority of the valve filler with F4, because of its good performance from the sliding friction coefficient (for steel friction coefficient f = 0.05 ~ 0.1), but also has a unique chemical stability, so widely used. But the F4 is also inadequate, first cold flow tendency to large; second is linear expansion coefficient, at low temperatures lead to leakage resulting shrinkage, resulting in a large number of frozen stem Department to open the valve malfunction. To this end developed by low-temperature valve seal structure of a self-shrinkage expansion coefficient, namely the use of the characteristics of F4, through the gap to the left to reach room temperature, low temperature can be sealed purpose. 2, valve body, stem bushing design requirements: 1) The low-temperature structure and shape of the shell valves. The correct choice of material or failure of the normal valve has an extremely reliable and important work. The structural characteristics of butterfly valves and globe valve, gate valve, compared not only to avoid a result of irregular shape, uneven shell thickness, at low temperatures resulting from shrinkage, thermal stress caused by the deformation, and because small butterfly , body shape is basically about is called, and thus heat capacity is small; to the consumption of cooling capacity is also small; shape of the rules would facilitate the valve cold measures. If the new model developed DD363H valve disc valves ensure reliable at low temperatures, the use of cryogenic valves in full accordance with the particularity of the design and manufacture, such as: shell material selection of a cubic lattice of 1Cr18Ni9Ti austenitic stainless steel. 2) The stem bushing choice: according to the user to reflect, and some low-temperature valve in the running among the rotating parts of the valve occurred viscous, occlusal phenomena have occurred, mainly due to: matching material selection reasonable, I stay in the cold gap is too small, and processing precision reasons. In the development of low-temperature valve, and take a series of measures to prevent the above phenomenon. For example: we stem the upper and lower bushing selected with friction coefficient and self-lubricating properties of SF-1-type composite bearings, so that can be applied to some of the special needs of low-temperature valve. Metal Sealed Butterfly Valve has the features of an ordinary valves do not possess. In particular, flow resistance is small, sealed, reliable, open and close rapidly, and long service life. The company developed three eccentric butterfly valve sealing ability of metal sealing ring from the elastic deformation to achieve sealing, thus eliminating the need with medium force, it can be done with a two-way seal. According to some characteristics of butterfly valves will be more people paying attention to. Butterfly in the future there will be more applied to the low-temperature devices。

原文来源：