Description
Size ： 1/2”~56”（DN15~DN1400）
Rating ： 150~2500LB（PN16~PN420）
Body Materials ： Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel
Trim ： Carbon Steel, Stainless Steel, Duplex Steel
End Connection ：RF，BW
Qilong fully welded ball valves are used mainly in Gas transmission and distribution pipeline (Mid-stream), typical for underground and buried installation The ball is fixed and the seat rings are floating, free to move along the valve axis.
Side load generated by pressure acting on the ball is absorbed by bearings.
At low pressure the seat sealing acting is achieved by the thrust of the springs acting on the seat. As the pressure increases the fluid pressure pushes the seat rings against the ball, making the sealing more reliable.
