c.Metal sealing butterfly valve in the application of low temperature devices introduced

I. Low-temperature disc valve sealing performance requirements:



Low-temperature valve leakage, there are two main reasons, the first internal leakage; second is leakage.



Second, valve body, stem bushing design requirements:



1) low-temperature structure of the shape of the valve housing. Material selection of the correctness of the reliable work of the normal valve has an extremely important significance. And the structural characteristics of butterfly valves, gate valve, compared not only to avoid the result of irregular shape, uneven wall thickness of the shell, resulting in low temperature shrinkage, thermal stress caused by deformation, and because small butterfly , about the basic body shape is known, thus the small heat capacity; to cold is also a small amount of consumption; the shape of rules to facilitate cooling of the valve security measures. DD363H such as newly developed disc-type valve in the valve in order to ensure reliable low temperature use, in full accordance with the specificity of low-temperature valve design and manufacturing, such as: choice of shell material with a cubic lattice, such as austenitic stainless steel of 1Cr18Ni9Ti.



2) the choice of stem Bushing: According to users, some of them are running low-temperature valves, valve parts rotational viscosity occurred in occlusion occurred from time to time, the main reasons are: material selection matching unreasonable, to stay in the cold space too small, as well as precision machining and other 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 friction coefficient with selected small and self-lubricating properties of the SF-1 composite bearings, so that low temperature can be applied to the special needs of some of the valve.



Butterfly valve with metal seal type is characterized by some general do not have valves. In particular, flow resistance is small, sealed reliable, rapid headstock, and long life. The Company developed three eccentric butterfly valve seal sealing metal edge from the elastic deformation to achieve sealing ring, which media do not need to use force, it can be sealed with a two-way. According to some of the characteristics of butterfly valves will be more people paying attention to. The future there will be more applied to the butterfly valve in the low-temperature equipment.

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