Top entry Ball Valves are widely used in oil and gas pipelines, and oil production, oil refining, petrochemical, chemical, chemical fiber, metallurgy, electricity, nuclear power, food and paper and other devices. Top entry ball valve in the pipeline removal simple and fast, easy maintenance and quick. When the valve fails in the pipeline needs repair, do not have to remove the valve from the pipeline, 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 valve seat can be repaired online. This service saves time, will produce the loss to a minimum. Top entry ball valve into a floating ball valve and fixed ball valve. Coat floating Ball Valve nominal size ≤ DN200.

Applied to the sphere of a compression spring, compression spring is the role of preload on the ball, so that the valve seat sealing surface in close contact under any circumstances, good sealing performance. And valve seat contact surface of the wedge angle of 10 °, the seat can be self-locking, the direction of the pipeline, when subject to greater pressure valve seat, the seat will not produce any displacement. Therefore, both the structure of the valve ball valve gate valve features have the advantage. Maintenance inspection found a leak valve and valve seat is easy, if you increase the spring preload, is bound to increase valve closing moments. In order not to increase the moment of valve closure, the sealing surface on the back of the seat plus a rubber O-ring to solve the problem of leakage of the valve seat sealing surface on the back.

Top entry Ball Valve fixed the shortcomings of the spring preload can not be adjusted and controlled, and large compression spring assembly, the assembly difficult. To solve this problem, instead of the spring material selection ANSI 302 304. ANSI 302 spring stiffness, corrosion resistance and 304 close. Furthermore, the increase of the spring seat and adjust the nut, the cylindrical valve seat and spring seat are turning screw, adjust the nut with a compression spring within the spring seat, the seat assembly into the valve body. As the installation prior to spring ball has been compressed, so the ball is very easy to install. When the ball assembly, it will adjust the nut out the spring seat, this time the spring preload of smaller spheres. If you want to increase the preload adjustment nut can be adjusted.

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