弹性硬密封蝶阀五大概述（Elastic hard sealing butterfly valve five overview）.docVIP

弹性硬密封蝶阀五大概述（Elastic hard sealing butterfly valve five overview） I. overview With the development of Chinas capital construction, large projects have been put into practice, and the number of valves, such as power, oil, chemical, urban water supply and drainage systems, has become more and more. Especially, the amount of butterfly valves is very large. Chinas production of metal hard sealing butterfly valve, from the sealing structure can be divided into two major categories, one is flexible hard seal structure, and the two is a multi-level hard sealing butterfly valve. Flexible hard sealing butterfly valve production in general below DN500 caliber, large diameter, multi use is a multi-level structure. DN500 below the maximum amount of butterfly valve, so users encountered problems in use, in this case, the problems often summarized, and guide the correct installation and use Two, special flange At present, the state of the flexible hard sealing butterfly valve flange without the corresponding special standards, we are in accordance with the existing national standards, in accordance with the standard flange size unchanged, will be used inside the socket type. The flange nominal diameter and is basically the same, so in order to effectively increase the sealing surface, but also provide convenience for installation, and ensure the normal use of the valve. Here, to remind users in the use of elastic hard sealing butterfly valve, the pair of anti flange must use special flange, especially with the body pressure ring matching pipe flange, must use special flange. Three 、 elastic structure analysis and problem The structure of hard seal butterfly valve is composed of main parts, such as valve body, valve plate, valve stem, elastic valve seat and pressure ring. The structure and function of pressure ring: side pressure ring as the sealing surface and the pipe flange sealing surface become sealing, a bolt hole in the side, with bolt pressing pressure ring fixed valve seat,