男人精品天堂_国产区综合_国产成A人亚洲精V品无码_日本极品喷水_精品国产一区二区亚洲人成毛片_天天做天天爱夜夜爽_亚洲视频第二页_色伊人网站_成人一区二区三区免费视频_久久香蕉国产线看观看99_无码专区视频中文字幕_久久精品久久久_福利一级片_国产少妇在线观看_亚洲宅男网av_xxx大片免费视频_中文字幕第24页_老人玩小处雌女hd另类_污污的网站视频_久久天堂综合亚洲鲁鲁五月天_国产欧美久久久精品影院_日韩黄色一级网站_青青视频在线免费观看_97理论片_初爱在线_日韩中文久久_女女互揉吃奶揉到高潮视频_一级毛片录像_欧美国产国产综合视频_日本字幕有码中文字幕

Globe valve, also known as shutoff valve, belongs to forced sealing valve, so when the valve closes, pressure must be exerted on the disc to force the sealing surface not to leak. When the medium enters the valve from bottom of the disc, the resistance to be overcome by the operating force is the friction between the stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than that is to open the valve, so the diameter of the valve stem is larger, otherwise the failure of the top bending of the valve stem will occur. There are three kinds of connection modes: flange connection, thread connection and welding connection.
The opening and closing parts of the globe valve are plug-shaped discs with flat or conical seals on the top of the seal. The disc moves in a straight line along the center line of the seat. The movement form of the valve stem (common name: concealed rod) can also be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Therefore, this type of cut-off globe valve is very suitable for cutting off or regulating and throttling. Because the stem opening or closing stroke of this kind of valve is relatively short, and has a very reliable cut-off function, and because the change of the seat opening is proportional to the disc travel, it is very suitable for flow regulation.