The three commonly used assembly methods for valves include the complete interchange method, the matching method and the repair method.
Complete interchange method: In this assembly method, each part of the valve can be assembled directly without any modification or selection. The assembled product can meet the specified technical requirements. In order to achieve this, valve parts must be processed exactly as designed to meet dimensional accuracy and geometric tolerance requirements. This method is suitable for valves with simple structures, such as globe valves, check valves and ball valves, as well as medium and small diameter valves. Its advantages are that the assembly work is simple and economical, does not require workers to have a high technical level, the production efficiency of the assembly process is high, and it is easy to organize assembly lines and specialized production.
Matching method (or matching method): In this method, the valves are assembled in a matching manner and the entire machine can be processed with economic precision. During assembly, certain sizes with adjustment and compensation functions will be selected to achieve the specified assembly accuracy. The principle of the matching method is similar to the repair method, but the method of changing the size of the compensation ring is different. The former changes the size of the compensation ring by selecting accessories, and the latter changes it by trimming the accessories. For example, the top core and adjusting gasket of the regulating valve type double-piece wedge gate valve, the adjusting gasket between the two valve bodies of the split ball valve, etc., are all made of special parts as compensation parts, and the thickness of the gasket is adjusted to meet the requirements. Assembly accuracy.
Repair method (or repair method): This method involves the repair and assembly of valve parts. Parts can be processed with economic precision, and during assembly, certain dimensions with adjustment and compensation functions can be repaired to achieve the specified assembly goals.
