Valve in fluid piping systems, valves to control the device, its main role is to isolate equipment and pipeline systems, regulate flow, prevent the return of the pressure regulation and excretion. Because the pipeline system to select the most suitable stop valve is very important, therefore, solution selection stop valve characteristics and the method and basis for the stop valve becomes crucial up.
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According to the threaded valve stem position can be divided into: the stop valve stem thread: stop valve stem threads outside of the body. The advantage is that stem from media erosion, ease of lubrication, more common use of such structures. Next thread stem stop valve: stop valve stem in the stop valve body threads. This structure stem threads direct contact with the media, vulnerability to erosion, and can not be lubricated. Such structure for small caliber and high temperature areas
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