Today lets talk about how the ball valve works. Firstly lets share the brief description of ball: Ball valve is designed according to the plug valve. Sphere around the axis of the stem by 90 degrees to achieve the purpose of opening and closing. Valve in the pipeline is mainly used for cutting, distribution and change the direction of media flow, the design of the ball into the V-shaped openings also has a good flow regulation. Ball is not only a simple structure, good sealing performance, but also in a certain range of nominal by the smaller, light weight, low consumption of materials, installation size, small, and the driving torque is small, simple, easy to open and close fast, the ball valve is the last decade one of the fastest-growing varieties of the valve. Especially in the United States, Japan, Germany, France, Italy, Spain, Britain and other industrialized countries, the valve is widely used, the use of the variety and quantity continues to expand, to the high temperature, high pressure, big mouth by high tightness, long life, excellent performance and adjust the direction of a valve function, its reliability and other performance indicators have reached a higher level and has partially replaced valve, globe valve, throttle. With the ball advances in technology, in the foreseeable short-term, see, in particular in the oil and gas pipelines, oil refining and nuclear industry on a cracker will have a wider range of applications. In addition, other large and medium-caliber industry, in areas of low pressure, valve will also be one of the leading valve type. Ball is 50 years of this century, the advent of a valve, in half a century, has developed into a major ball valve. Ball valve is mainly used for cut off or connected media can also be used for fluid regulation and control, V-ball valve for flow control and more precise control, while the ball valve is used to allocate the flow of media and change the media. Compared with other valves, ball valves have some advantages as follows:
1, fluid resistance, ball valve in the fluid of all kind of least resistance, even reduced diameter valve, the fluid resistance is quite small.
2, switch quickly and easily, rotate 90 degrees as long as the stem, the ball valve is completed fully on or off action, it is easy to open and close fast.
3, good sealing performance. PTFE valve seat ring commonly used materials such as flexible, easy-to ensure the sealing, and valve sealing force with medium pressure increases.
4, the stem seal and reliable. Valve open and close only when the stem rotates, so the valve stem packing seal can not easily be destroyed, and the sealing strength of the stem seal down with medium pressure increases.
5, the valve open and close only rotate 90 degrees, so easy to achieve automatic control and remote control, ball valves can be configured to pneumatic devices, electric equipment, hydraulic equipment, Pneumatic-hydraulic device or electro-hydraulic linkage.

Ball valve installation instructions
1, the valve before and after the pipeline is ready. Before and after the pipeline should be coaxial, the two should be parallel to the flange sealing surface. Pipeline should be able to withstand the weight of the ball valve, or pipe must be equipped with the appropriate support.
2, the purge valve before and after the pipe clean, clear away the oil pipeline, welding slag, and all other impurities.
3, the check valve of the signs, identifying ball intact. Fully open the valve fully closed several times confirmed that it is working.
4, remove the valve protection on both ends of flange pieces.
5, clear the check valve may have dirt hole, and then clean the valve hole. Even between the valve seat and the ball only small particles of foreign matter may damage the valve seat sealing surface.
6, the valve mounted on the pipeline. Valve can be installed in either end of the upstream side. Driven by the valve handle can be installed anywhere in the pipeline. But with a gear box or pneumatic valve driver installation should be upright, that is installed in horizontal pipelines, and the drive is pipelines at the top.
7, the valve between the flange and pipe flange design by piping installed gasket.
8, the flange bolts to be symmetric, successive, evenly tightened.
9, connecting pneumatic lines (pneumatic drive).
10, the operation start the drive, closed ball several times, should be flexible without Zhise, confirmed it is working.
11, according to the design requirements of the pipeline and the pipeline between the valve sealing Flange for inspection.

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2011-04-18

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