connection mode, together a total of three, let's introduce one by one to you. A flange connection, the Industrial Valves connection method is often used for pressure and size of pipe connection is used, its advantage lies in the assembly and disassembly of convenience, the disadvantage is the use of this connection method of the valve price is higher, and when its work under conditions of more than 350 ℃, easy to cause the relaxation of various components, resulting in the decrease of bolt load capacity is serious when even will cause the leakage phenomenon to appear. Second, threaded connection method using the connection method of premise condition is, be connected on hole. When for threaded connections, can directly insert the bolt in the hole and then screw down the other end. This connection method often used in fittings mainly include screw, washer, etc. , due to the size of the fittings and so on all use of standardized design and processing, so when use the strong commonality. This connection method of defects is that may cause large leaks channel, so the channel must be blocked. If the Industrial Valves using material can be welded, the welding sealing methods is the best. In general, this method under the nominal size of the valve cannot too big, can accentuate otherwise the valve connection. Three, welding connection method the connection method to compare Yu Falan connection method, more reliability and application conditions of applicability, even in some conditions can also be used. In summary, it is generally used in high temperature, can used in the long-term stable operation condition, such as nuclear engineering the application of occasions. This kind of bearing faults show the, when fault occurs, the valve is not easy to remove. At the same time, the fault was lifted to install again to once again for welding, greatly increased the installation time and cost. At the same time, to the operation of the welding personnel technical level has strict requirement, must ensure that the welding seam error control in a small range. In addition, for the valve in harsh conditions, generally USES the groove of the welding.
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