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The ball valve is an evolution of the plug valve, with its opening and closing mechanism being a sphere. The sphere rotates 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing. Ball valves are mainly used in pipelines to cut off, distribute and change the direction of media flow. The V-shaped opening of the ball valve also provides a good flow regulation function. The ball valve has a simple structure and good sealing performance. It is also small in size, lightweight, and consumes less material within a certain nominal throughput range. Additionally, it has a small installation size and requires minimal driving torque, making it easy to operate and achieve rapid opening and closing. As a result, the ball valve has become one of the fastest-growing valve varieties in recent years.
Ball valves have widespread use in developed countries including USA, Japan, Germany, France, Italy and Great Britain. Their usage varieties and numbers continue to expand due to their ability to withstand high temperature, high pressure, large mouth, and provide excellent regulating performance. They have also become multi-functional and have a long life. Ball valves have replaced gate valves, globe valves, and throttle valves in some applications due to their higher reliability and performance.
However, it is important to note that ball valves should not replace all types of valves. In the near future, advances in technology will expand the use of ball valves, particularly in oil and gas pipelines, oil refineries and crackers, and the nuclear industry. Additionally, in other industries that require large and medium-sized calibre, low and medium pressure, ball valves are becoming increasingly popular. Starting or stopping the flow of a medium is the main purpose of ball valves. They can also regulate and control fluid flow. "V" ball valves allow for finer regulation of flow, while "3" ball valves serve for distribution and redirecting the flow of the medium.
Suitable for frequent operation, this device opens and closes quickly and lightly.
1.It has a simple structure, relatively small size, and is lightweight, making it easy to maintain.
2.It has good sealing performance and is not restricted by the installation direction, allowing for arbitrary medium flow direction.
3. it operates with no vibration and low noise due to its small fluid resistance.
The main disadvantages of ball valves are their various structural forms, including floating ball valves, fixed ball valves, resilient ball valves, and oil-sealed ball valves. There are different types of valve, including direct, angled and 3-way. Three-way valves are further divided into T-shape and L-shape. Ball valves can have threaded, flanged or welded connections.
When installing and maintaining a ball valve, it is important to keep in mind the following:
1.The valve handle should have a designated rotation position.
2.Ball valves are not suitable for throttling.
3.Install in an upright position for ball valves with transmission mechanisms.
1.Before and after preparing the pipeline, ensure that the front and rear pipelines are coaxial and that the sealing surfaces of the two flanges are parallel. The pipeline should be able to support the weight of the ball valve, otherwise, appropriate support must be added.
2.Clean the valve and pipeline thoroughly, removing any oil, welding slag, or other impurities.
3.Check the ball valve for any damage and ensure that it is intact. The valve should be fully opened and closed several times to confirm its normal operation.
4.Remove the ball valve ends of the connecting flange on the protective parts.
5.Check the valve hole for possible dirt and clean it thoroughly. Even small particles of foreign matter between the valve seat and the ball can damage the valve seat sealing surface.
6.Attach the valve to the piping. Mountable on both ends of pipe. Valves with handle actuation can be installed at any point along the pipeline. However, ball valves with gearboxes or pneumatic actuators should be installed in an upright position, specifically on horizontal piping with the actuator above the piping.
7.According to the pipeline design requirements, it is necessary to install a gasket between the valve flange and pipeline flange.
8.Tighten the flange bolts symmetrically, one at a time and equally.
9.Connect the pneumatic pipeline when using a pneumatic driver.
10.Operate the driver to open and close the ball valve several times to confirm that it works properly.
11.Check the sealing performance of the flange between the pipeline and ball valve according to the pipeline design requirements.
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