Jacket ball valves are widely used in oil and gas pipelines, and oil production, oil refining, petrochemical, chemical, chemical fiber, metallurgy, power, nuclear power, food and paper and other devices. Jacket type ball valve in the pipeline to remove the simple and rapid, convenient and fast maintenance. When the valve fails in the pipeline needs repair, without removing the valve from the line, only removed the flange bolts and nuts, valve cover and stem assembly from the body with the take down and remove the ball and seat assemblies. Ball and seat can be repaired online. The maintenance saves time, and the loss in production is reduced to the lowest point.
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Jacket type ball valve is divided into floating ball ball valve and fixed ball valve.
A floating ball valve nominal size of less than DN200. A compression spring is applied on the sphere, the compression spring is applied to the sphere to make the pre tightening force, so that the valve seat sealing surface is in close contact under any condition, and the sealing performance is good. The contact surface of the valve seat and the wedge angle of 10 degrees, the seat can be self locking, in the direction of the pipeline, when the valve seat is under great pressure, the valve seat will not produce any displacement. Therefore, the structure of the valve of both the characteristics of the valve and the advantages of the ball valve. In the maintenance inspection found that the valve body and the valve seat is easy to leak, if the increase in the spring preload, is bound to increase the ball valve closing torque. In order not to increase the ball valve closing moment, the back of the seat sealing surface with a rubber O ring, to solve the valve seat sealing surface leakage problem.
The disadvantage of the fixed ball valve is that the spring preload can not be adjusted and controlled, and the spring compression amount is large, and the assembly is difficult. In order to solve this problem, the spring material selection ANSI 302 instead of 304. ANSI 302 spring stiffness is good, its corrosion resistance and 304 similar. In addition, the increase of the spring seat and the adjusting nut, the cylindrical valve seat and the spring seat are turning screw, adjust the nut with a compression spring within the spring seat, the seat assembly into the body. Due to the installation of the ball before the spring has been compressed, so it is convenient to install the ball. When the ball is assembled, the adjusting nut is out of the spring seat, and the spring is smaller to the ball preload. If you want to increase the preload, adjust the nut can be used to adjust.
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