Compared with other mechanical manufacturing processes, the valve manufacturing process has the following characteristics:

A. The manufacture and inspection technology of valve rough is very complicated. The valve's casting blank is a thin-walled shell with complicated structure. Casting requires a smooth surface, casting characters clear, especially to have a dense structure, and do not allow the occurrence of pores, shrinkage, cracks, sand and other defects. In order to meet the above requirements, a series of technological measures should be taken during casting, such as selecting molding materials with high fire resistance and controlling moisture of molding sand, and layer-by-layer compaction during molding to ensure the hardness of molding sand, adopt reasonable gating and riser system and strictly control pouring speed and temperature. Due to the high technical requirements, the casting process of valve rough is much more complicated than that of common castings.

In addition, besides inspecting the size, position accuracy and appearance, some valves need to be inspected for metallographic structure, mechanical properties, corrosion resistance and non-destructive testing, etc. .

B. It's very difficult to machine. Due to the variety of valve materials, except various cast iron, carbon steel, most of its high-strength, corrosion-resistant and high-hard material cutting performance is very poor, it is difficult to make parts meet the requirements of the machining precision and Surface roughness. The valve sealing surface of the geometry of the precision and Surface roughness requirements are very high, which increases the difficulty of machining the valve.

At the same time, the poor cutting performance of valve material brings many new problems to the machining method, tool angle and geometry shape, tool material, cutting parameters, process equipment and so on.

C. Valve parts are difficult to install on machine tools. Valve main parts of the structure, shape more complex, some parts are thin-walled, slender parts, poor rigidity. When machining on the machine tool, it is very difficult to locate and fix the fixture, so a complicated special fixture is often needed.

For some valve parts, the positioning accuracy of the base plane is lower and the Surface roughness is higher, sometimes even using non-machined surface positioning. The sealing surface and other parts of the processing accuracy and Surface roughness requirements are very high, it is difficult to ensure the quality of processing. Therefore, in order to meet the needs of technology, it is often necessary to improve the accuracy of positioning base surface and reduce the Surface roughness, or machining the positioning base surface on the non-machining surface, which increases the complexity of the valve manufacturing process.

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