91久久婷婷国产综合精品青草-91久久夜色精品国产网站-91老色批网站免费看-91噜噜噜-美女露出扒开尿口让男人桶-美女露出尿口让男人桶爽网站

location:Home / Products / Forged steel valve / Cast steel globe valve

Cast steel globe valve

Cast steel globe valve

Consult Cast steel globe valve

A shut-off valve, also known as a shut-off valve, belongs to the forced sealing type valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from below the valve disc, the resistance that needs to be overcome by the operating force is the friction force between the valve stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise the failure of the valve stem top bending will occur. There are three types of connection methods: flange connection, screw connection, and welding connection. After the appearance of self sealing valves, the medium flow direction of the shut-off valve changes from above the valve disc to enter the valve chamber. At this time, under the action of medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. At the same time, under the action of the medium, this type of valve is also relatively tight. The "three modernizations" of valves in China once stipulated that the flow direction of shut-off valves should be from top to bottom. When the shut-off valve is opened, the opening height of the valve disc is between 25% and 30% of the nominal diameter. When the flow rate has reached, it indicates that the valve has reached the fully open position. So the fully open position of the shut-off valve should be determined by the stroke of the valve disc.

The opening and closing part of a cast steel globe valve is a plug shaped valve disc, with a flat or conical surface on the sealing surface. The valve disc moves in a straight line along the centerline of the valve seat. The movement form of the valve stem can also be used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, mud, oil products, liquid metals, and radioactive media. Therefore, this type of shut-off valve is very suitable for cutting, regulating, and throttling purposes. Due to the relatively short opening or closing stroke of the valve stem and the highly reliable cut-off function, as well as the proportional relationship between the change of the valve seat opening and the stroke of the valve disc, this type of valve is very suitable for regulating flow.


If you have any questions or suggestions regarding the product, or if you would like to know, you can contact us at any time.

主站蜘蛛池模板: 亚洲图片欧美色图 | 精品一区二区三区视频在线观看 | 污视频网站免费 | 日韩欧美在线观看 | 成人久久久精品乱码一区二区三区 | 国产欧美精品区一区二区三区 | 免费看黄在线网站 | 狠狠色婷婷狠狠狠亚洲综合 | 一级特黄aaa大片在线观看 | 日韩国产欧美精品综合二区 | 国产禁女女网站免费看 | 伊人情涩网| 欧美在线视频精品 | 国产精品成人网 | 日韩精品一区二区三区免费观看 | 亚洲欧美成aⅴ人在线观看 亚洲欧美成人 | 欧美在线观看一区 | 久久受www免费人成看片 | 亚洲欧美一区二区三区二厂 | 毛片免费看看 | 欧美mv日韩mv国产mv网站 | 狂野欧美性猛交xxxx免费按摩 | 久久午夜鲁丝片午夜精品 | 好吊日在线视频 | 日本高清乱偷www | 欧洲成人在线视频 | 成人免费在线视频网站 | 国产精品短视频免费观看 | 免播放器在线 | 免费看黄无遮挡滚床单视频 | 精品成人一区二区 | 亚洲美女爱做色禁图无遮 | 久久人人爽人人爽人人小说 | 国产精品视频区 | 伊人手机视频 | 亚洲免费视频网址 | 操你啦在线 | 国产在线观看xxxx免费 | xyx性爽欧美视频 | 精品久久久久免费极品大片 | 操操影视|