亚洲精品自在线拍2019&国产一级a&少妇少洁第1一40章李明干白洁&欧美+国产+麻豆&中文乱码欧美日韩更新&一级肉体毛片视频

CN EN
QQ
+86-(0)15021555579
qrCode

NEWS



Location:News >> 技術(shù)知識

Directly buried lengthening rod full welded ball valve

Release time:2023/12/15


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.