The ball valve is evolved from the cock, and its opening and closing member ACTS as a ball, which is opened and closed by rotating 90o around the axis of the stem. Ball valves are mainly used to cut off, distribute and change the direction of medium flow in pipelines.Ball valve is not only simple structure, good sealing performance, and in a certain nominal through the scope of small volume, light weight, less material consumption, small installation size, and driving torque is small, simple operation, easy to achieve rapid opening and closing, ball valve is one of the most rapid development of valve varieties in recent decades. Especially in Japan, Germany, France, Italy, and west, Britain and other developed countries, the ball valve has a very wide range of USES, use of variety and quantity continues to expand, and to high temperature and high pressure, big, high sealing, long life, good regulation performance, and a multifunctional direction valve, its reliability and other performance indicators have reached a higher level, and has set up a part replace gate valve, cut-off valve, throttle valve.With the development of ball valve technology, it will be widely used in the foreseeable future, especially in oil and gas pipelines, oil refining cracking plant and nuclear industry. In addition, in other industries in the large and medium caliber, low and medium pressure field, ball valve will also become one of the dominant valve types.Ball valve is a kind of valve in the 1950s, in half a century, ball valve has developed into a major valve class.Ball valves are mainly used to cut or connect the medium, but also can be used for fluid regulation and control, v-type ball valves can be more accurate flow regulation and control, and three-way ball valves are used for distribution of media and change the flow of media.
1PC Ball Valve
1PC ball valve, 2PC ball valve, 3PC ball valve, because the structure is different and named, a piece of ball valve is mainly composed of a piece, two pieces is composed of two parts, three pieces is composed of three parts, two pieces and three pieces of diameter is generally full diameter.It is also divided into heavy and light, according to the material is divided into, carbon steel internal thread ball valve, stainless steel internal thread ball valve,304 internal thread ball valve,316 internal thread ball valve, some places also called internal thread ball valve, one piece of internal thread ball valve, two pieces of internal thread ball valve, three pieces of internal thread ball valve, of course, and internal thread three-way ball valve.
2PC Ball Valve
A type of ball valve and gate valve are the same type of valve, the difference is that its closure is a ball, the ball around the center line of the body to achieve open, closed a valve.Ball valve in the pipeline is mainly used to cut, distribution and change the flow direction of the medium.Three-piece ball valve is a new type of valve widely used in recent years.
3PC Ball Valve
One - piece ball valve has the following advantages: 1. The ball valve is not limited by the installation direction, the flow of the medium can be arbitrary.Small fluid resistance, the full size of the ball valve basically no flow resistance.2. Simple structure, relatively small volume, light weight, easy to maintain.3. Tight and reliable.It has two sealing surface, and at present the ball valve sealing surface material widely used a variety of plastics, good sealing, can achieve complete sealing. It has also been widely used in vacuum systems.4. Ball valve is suitable for frequent operation, quick opening and closing, light.Easy to operate, quick to open and close, from full open to full close as long as the rotation 90°, convenient for remote control.5. Easy maintenance, ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are more convenient.6. Good sealing performance of ball valve.When fully open or fully closed, the sealing surface of the ball and seat is isolated from the medium, which will not erode the sealing surface of the valve when the medium passes through. 7. Wide range of applications, ranging from small size to a few millimeters, to a few meters, from high vacuum to high pressure can be applied.8. The ball valve can be used in the medium with suspended solid particles because of its wipeability during the opening and closing process.9, ball valve fluid resistance is small, no vibration, small noise.
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