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Valve connection, a total of three, let's introduce it to you one by one. First, the flange connection method This valve connection method is usually used for pressure and diameter pipe connection, its advantage lies in the convenience of assembly and disassembly, the disadvantage is that the use of this connection valve prices are high, and when When it is operated at more than 350 ° C, slackening of parts is likely to occur, resulting in a decrease in load capacity of the bolt, and in some cases, leakage may even occur. Second, the threaded connection method The prerequisite for the use of this connection method is to be connected through holes. When threaded, insert the bolt directly in the through hole and tighten the other end. Such connections are often used to connect the main screw, washer, etc., due to the size of the connectors are standardized design and processing, so the versatility in use. The disadvantage of this connection method is that it can cause a large leak channel, so the channel must be blocked. If the valve material is weldable, it is best to take the method of welding seal. In general, this method of connecting the nominal diameter of the valve can not be too large, otherwise it will aggravate the valve connection. Third, the welding connection method This connection method compared to the flange connection method, more reliability and applicability of the applicability of the conditions, even in some harsh environments can also be used. In summary, it is generally used in high temperature, long-term stable operation of the conditions used, such as nuclear energy projects and other occasions. The disadvantage of this type of bearing is that it is not easy to disassemble the valve when a fault has occurred. At the same time, once the trouble is solved, it will be welded again when reinstalling, which greatly increases the installation time and cost. At the same time, there are strict requirements on the technical level of the welding operator, and the welding seam error must be controlled within a very small range. In addition, the valve in the harsh conditions, the general use of groove on the welding.