欧美A级毛欧美一级A大片视频|国产亚洲精品亚我不卡电影院|亚洲成AV人片在线观看无码|日韩三极片一区二区三区在线播放|在线观看免费人成视频播放|色哟哟国产精品免费观看,日韩毛片免费看九九久久精品国产_欧美线人一区二区三区_欧美精品午夜久久久伊人_日韩欧美人妻一区二区三区_国产不卡视频一区二区在线观看_国产日韩精品亚洲二区视频 ,四川少妇搡BBW搡BBBB,少妇厨房愉情理伦BD在线观看,无套内谢的新婚少妇国语播放,少妇AAA级久久久无码精品片,丰满少妇被猛烈高清播放,熟妇女人妻丰满少妇中文字幕,东北少妇不戴套对白第一次,四川少妇BBW搡BBBB槡BBBB,少妇荡乳情欲办公室456视频 ,安徽妇搡BBBB搡BBBB,四川少妇BBB凸凸凸BBB,另类老妇性BBWBBW,四个熟妇搡BBBB搡BBBB,四川少妇BBW搡BBBB槡BBBB,欧美BBBWBBWBBWBBW,四川少妇搡BBW搡BBBB,老太奶性BBWBBW免费看,妖小槡BBBB槡BBBB槡

This product is designed and manufactured in full compliance with API Spec 6A "Wellhead and Tree Equipment Specification" requirements, and can meet domestic and international API Spec 6A specifications of the equipment box to use each other.
The valve is a check valve, which relies on the pressure of the medium to achieve the valve core and the valve between the metal-to-metal seal, medium pressure, sealing performance is better.The valve chamber can withstand line pressure at all times.
The valve body is made of alloy steel forgings, with strong mechanical properties, can withstand high pressure, with safe and reliable performance.
The valve cover and the valve body are connected by bolts, the seal is the sealing ring on the valve cover and the inner wall of the valve body is sealed, the sealing performance is reliable.It makes the valve cover and valve body assembly gap is small (designed to 0), thereby reducing the corrosive medium on the bolt and screw hole erosion and reduce the bolt load.
Spool and valve sealing surface surfacing carbide, so that it has good wear resistance and corrosion resistance, spool with sulfur-resistant materials, other parts of the method of limiting hardness, which can be in the H2S-containing environment.