Top Entry Ball Valve(Floating Ball)
The top mounted ball valve is easy to disassemble and quickly maintain on the pipeline. When the valve malfunctions in the pipeline and needs to be repaired, there is no need to disassemble the valve from the pipeline. Simply remove the middle flange bolts and nuts, remove the valve cover and valve stem assembly together from the valve body, and then remove the ball and valve seat assembly. The ball and valve seat can be repaired online. This type of maintenance saves time and minimizes losses in production.
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The top mounted ball valve is easy to disassemble and quickly maintain on the pipeline. When the valve malfunctions in the pipeline and needs to be repaired, there is no need to disassemble the valve from the pipeline. Simply remove the middle flange bolts and nuts, remove the valve cover and valve stem assembly together from the valve body, and then remove the ball and valve seat assembly. The ball and valve seat can be repaired online. This type of maintenance saves time and minimizes losses in production.
Top mounted ball valves are divided into floating ball valves and fixed ball valves.
Upper floating ball valve with a nominal size ≤ DN200. A compression spring is applied to the ball, and the function of the compression spring is to apply a pre tightening force on the ball, making the sealing surface of the valve seat in close contact under any circumstances, with good sealing performance. The wedge angle of the contact surface between the valve seat and the valve body is 10 °, and the valve seat can self-lock. In the pipeline direction, when the valve seat is subjected to significant pressure, there will be no displacement of the valve seat. Therefore, this type of valve structure has both the characteristics of a gate valve and the advantages of a ball valve. During maintenance and inspection, it was found that the valve body and valve seat are prone to leakage. If the pre tightening force of the spring is increased, it will inevitably increase the closing torque of the ball valve. In order to avoid increasing the closing torque of the ball valve, a rubber O-ring was added to the back of the valve seat sealing surface to solve the problem of leakage on the back of the valve seat sealing surface.
Design standards for top mounted ball valves: API 6A, API 6D, ANSI B16.34, BS 5351
Structure length: ANSI B16.10
Connection standard: ANSI B16.5
Main material: carbon steel, stainless steel, alloy steel
Pressure test: API 598
Pressure range: Class600-1500
Nominal diameter: 1/2 "(15mm) -8" (200mm)
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