There are many types of end connections used to connect different pipes. The most important of these species are threaded, flanged and weld end connections. Here are three ways to connect will be introduced briefly as follows:
What comes first is the end of the thread. This type of connection is often used to indicate the end of the valve, which is transformed into a tapered pipe thread, or just screwing with the measuring tube or tubes for connection. Since a connection is established in thisWay, a loss of relatively large passages appear, putty, tape or filler is used to block the move. If the material of the valve body can be welded, but its coefficient of expansion is too large or the temperature range of operation is too large, welded to seal threaded. The diaMeter of the valve, which is suitable for this compound is under DN 50 If the DN is too long, it is quite difficult to install and articulation. Sometimes, inTo facilitate the installation or dismantling the valve was through this connection, a sleeve is available, the pipeline system at appropriate points. The valve can have a length less than DN 50, the link to the right as the coupling hose, because the threads of the valve can Union, the two parts together.
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The next type is the end flange. The valve end flange is connected relatively easy to install and dismantle. But in comparison with the valveare linked by the common thread of these valves are heavier weight and more expensive in price. The connection flange can be used in a wide range, to connect all types of tubes of different sizes and pressure due to the flange connection requires less torque than the wire one. While everything has two sides, like a coin. The flanged connection is not perfect and has its own defects. At temperatures above 350 ° C, the flange can developLoss, because it brings very high blood pressure when the bolt, flange and filler relax and reduce the load on the screw.
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The third type is the connection end of welding. And 'applicable to various pressures and temperatures. And even in relatively difficult, is more reliable than the end flange. However, welding also has its own unworthiness. It 'difficult to remove and install valve welding mode. While only a result of the function, the type ofThe connection is particularly suitable for the valve, which should work for a long time or hash-state, as the pipes in nuclear project or a project of ethylene. In addition, about one thing. Since the end of the welding socket connection will form a gap between the socket and the tube, it is possible that the gap will be eroded by the media.
Different end connections for valves
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