The Overview of Long Pipeline Ball Valve

With the development of society, pipe transportation has been the main ways for the material transportation in the world, especially for the long transportation for gas and oil. It is reported that a great number of petroleum production countries or consumption countries make great use of long pipeline to solve the transportation of different resource such as oil or gas. 95% gas transportation adopts the pipeline way. According to statistics, at present, the total length for the pipeline used for transporting oil and gas has been over 2.6 millions kilometers. Because the pipeline used for long transportation is very long and also will pass through a lot of harsh places such as desert, forest, river, mountain, marsh and so on, the requirement for long pipeline ball valve is high than the common one in order to ensure the safety, sealability and strength. In the long pipeline system, the required pipeline ball valve must have the following functions such as controlling the medium, changing the direction of the medium flow, preventing reflux, cutting off the medium, blocking the pipe and so on. In order to realize the above-mentioned functions, the long pipeline ball valve must be provided with the following features. Firstly, reliable sealability. The long-distance pipeline can only be checked at the regular time and sometimes it has to pass through high mountain, desert, grassland, earthquake region and other places. If the sealability is not good, it maybe will result in leakage or even the serious accident. Therefore, for preventing these things, this kind of valve must have the good sealability, especially for the sealiability of urgent grease injection. Secondly, the operation time should be long. Once the long pipeline ball valve is used, it can not stop working in several years or even in more than ten years. The longer it operates, the better it is. For prolong the service time, the valve seat is of great importance. Because to some degree it depends on the using time of the valve. Thirdly, the valve must have the high strength and resistance force. In the transportation process, the pressure of this valve may reach at 10.0MPa and the length may be very long. Therefore, it is easy to suffer the extending, curving or squeezing by the external forces such as earthquake, temperature or equipment vibration. In order to ensure the normal operation of the valve, enough strength is essential. Fourthly, the long pipeline ball valve should be resistant to corrosion. Because the natural gas contains the Hydrogen sulfide, which can erode the valve and eat the mechanical device, it is of great importance to select resistance-proof material. Fifthly, it has the automatic function. As we know, the long pipeline ball valve is controlled by the central control room. So in order to control the valve at the long distance immediately, the valve should be controlled automatically. Last but not least, the valve must be light in weight and tight in structure. With this feature, it is convenient to install and repair the valve.
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