中老年熟妇激情啪啪大屁股_凹凸国产熟女精品视频app_最美情侣高清韩剧免费观看_公交车被cao得合不拢腿视频_高清+无码+磁力链_妓女嫖客叫床粗话对白_成人无码一区二区三区免费网站_国产又粗又长又黄又猛又爽视_无码人妻一区二区三区在线

CN EN
QQ
+86-(0)15021555579
qrCode

NEWS



Location:News >> 技術(shù)知識

Buried with their double diffusion welded ball valve

Release time:2023/12/22


The fire structure design: 
 According to API607 / BS6755 norms, the use of fire in the valve site, the secondary seal made of non-metallic materials in the ring decomposition or destruction under high temperature, then the primary metal seal can quickly close the ball Play a seal. Unique double-stage sealing seat structure design to ensure the reliability of the valve seat fire.