国产淫语对白丨一级高清免费毛片丨a免费在线观看丨三级三级久久三级久久18丨2019精品国自产拍在线不卡丨四虎影库永久地址丨www国产成人免费观看视频丨日韩欧美中文丨影音先锋中文字幕无码丨人妻激情文学丨黄色免费观看网站丨免费观看性生交大片女神丨久久婷婷五月综合尤物色国产丨www.色天使丨亚洲精品色无码av试看丨欧美日韩久久婷婷丨精品视频在线看丨丰满蕾丝乳罩少妇呻吟91丨伊人色综合久久天天丨亚洲成人一区二区三区

YJ41W Special Oxygen Globe Valve produced and sold by Baigang valve group is a forced-sealed valve, so the valve is closed, you must apply pressure to the valve to force the sealing surface does not leak. When the medium from the bottom of the valve into the valve six, the operating force needed to overcome the resistance is the stem and packing friction and the pressure generated by the media thrust, off the valve force than the valve opening force, so the valve The diameter of the rod should be large, otherwise it will happen to the top of the valve stem failure. In recent years, from the self-sealing valve appears, the flange of the media cut off the valve to change from the top of the valve into the valve chamber, then under medium pressure, the valve closing force is small, and open the valve force, valve The diameter of the rod can be reduced accordingly. At the same time, in the medium, this form of valve is also more stringent.

1, the oxygen valve is open, the valve opening height, 25% to 30% of the nominal diameter, the flow has reached its maximum, indicating that the valve has reached the fully open position. Therefore, the full-stop position of the valve, valve stroke should be determined.

2, small work schedule, opening and closing time is short. 
3, good sealing, friction between the sealing surface is small, longer life expectancy.

YJ41W Special Oxygen Globe Valve main performance and use :

YJ41W Special Oxygen Globe Valve main dimensions: