Troduction To The Ball Valve And The Function Of The Ball Valve

1 Ball valve structure
The ball valve is evolved from the plug valve. Its opening and closing part is a sphere, which uses the sphere to rotate 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing.

2 Ball valve function
The ball valve is mainly used to cut off, distribute and change the direction of the medium flow in the pipeline. The ball valve designed as a V-shaped opening also has a good flow adjustment function.

The ball valve is not only simple in structure, good in sealing performance, but also small in size, light in weight, low in material consumption, small in installation size, and small in driving torque, easy to operate and easy to achieve within the specified nominal passage range.



Quick opening and closing is one of the fastest growing valve varieties in the past ten years. Especially in developed countries such as the United States, Japan, Germany, France, Italy, West and Britain, the use of ball valves is very extensive, and the types and quantities used are  It continues to expand, and develops towards high temperature, high pressure, large mouth, high sealing performance, long life, excellent adjustment performance and multi-function valve. Its reliability and other performance indicators have reached higher water levels.Flat, and has partially replaced gate valves, stop valves, and regulating valves.
With the advancement of ball valve technology, in the foreseeable short time, there will be more extensive applications in oil and gas pipelines, oil refining and cracking units, and the nuclear industry. In addition, in other industries the ball valve will also become one of the leading valve types in the large and medium-sized calibers, medium and low pressure areas.



3 advantages of ball valve
Has the lowest flow resistance (actually zero).
Because it will not get stuck during work (when there is no lubricant), it can be reliably applied to corrosive media and low-boiling liquids.
In a larger pressure and temperature range, a complete seal can be achieved.
It can realize fast opening and closing, and the opening and closing time of some structures is only 0.05~0.1s to ensure that it can be used in the automation system of the test bench. When the quick opening and closing valve i], the operation has no shock.
The ball closure can be automatically positioned in position.
The working medium is reliably sealed on both sides.
When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface.
With compact structure and light weight, it can be considered as the most reasonable valve structure for cryogenic media systems.
The valve body is symmetrical, especially when the valve body structure is welded, which can well withstand the stress from the pipeline.
The closing piece can withstand the high pressure difference when it is closed.
The ball valve with the fully welded body can be directly buried in the ground, so that the internal parts of the valve will not be corroded, and the maximum service life can reach 30 years. It is the most ideal valve for oil and natural gas pipelines.
Because the ball valve has the above advantages, it has a wide range of applications. The ball valve can be applied to:
The nominal diameter ranges from 8mm to 1200mm.
The nominal pressure ranges from vacuum to 42MPa.
The working temperature ranges from -204C to 815C.