少妇人妻精品一区二区三区-成年人看的性生活视频-欧美三级a做爰全过裸体-国产夫妻性生活免费看

Working principle of globe valve

2014-08-08 Number of attention:

Opening and closing parts (discs) driven by the stem, along the axis of the seat (sealing surface) do a straight-line movement of the valve is called globe valve.




The globe valve is generally composed of driving parts (handwheel), stem, valve body, valve cover, disc (closure) and filling device. The hand wheel is connected with the valve stem, and the valve disc is driven by the valve stem, so that the valve disc moves reciprocating along the axis of the valve seat, so that the pipeline is connected or cut off.




Globe valves are widely used, mainly for high pressure and small caliber occasions, generally only to DN400 (NPS16), larger caliber specifications only for special pipelines. For example, large-diameter stainless steel globe valves are used in large-scale oxygen pipelines because of friction between other valves and electrostatic ignition.




The valve stem generally rotates and lifts, and the handwheel is fixed at the top of the stem. When the hand wheel rotates clockwise, the stem thread rotates downward, the disc sealing surface contacts closely with the seat sealing surface, and the globe valve closes; when the hand wheel rotates counterclockwise, the stem thread is turned up, the disc sealing surface and the seat sealing surface are separated, and the globe valve opens.


宅男在线视频免费播放| 黄色国产一区二区99| 亚洲高清成人在线观看 | 亚洲国产精品一区二区电影| 人妻上司无奈中文字幕| 女同av亚洲女人天堂| 亚洲乱码精品中文字幕| 91精品国产网站在线看| 亚洲伦理一区二区在线观看| 人妻熟女一区二区视频| 五月婷婷丁香在线免费视频| 一二三日韩在线不卡| 亚洲一区二区三区精品蜜桃久久| 国产精品一区2区3区| 丰满高潮少妇在线观看| 日本亚洲国产一区二区三区| 性感美女深喉口爆吞精| 国产熟女大屁股白浆一区二区| 中文字幕人妻一区色偷偷久久| 九九热这里有精品在线观看| 超碰成人av免费观看| 大尺度很肉污到流水的短文| 人妻友田彩也香中文字幕| 成人av一区二区三区| 五月婷婷六月丁香综合激情| 亚洲男人av天堂午夜在| 成为人免费高清视频视频| 国产亚洲精品视频在线网| 欧美黄片在线免费观看视频| 免费看黄在线永久观看| 亚洲国产国语在线对白观看| 国产美女精品在线播放| 亚洲日本韩国一区二区| 中文无线乱码二三四区| 9l久久午夜精品一区二区| 99精品久久久久久噜噜| 伊人久久大香线蕉综合影院首页| 91九色中文视频在线观看| 蜜臀av午夜福利在线观看| 成人av影视中文字幕| 亚州国产av一区二区三区伊在|