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manufacturing process compared with other institutions, the valve manufacturing process has the following characteristics:

① valve rough manufacturing process and inspection process more complicated.

valves rough castings are thin-walled shell structure called the complex pieces. Casting requirements of its smooth surface, cast the word clear, especially to have dense defects. To meet these requirements, casting a series of technological measures should be taken, such as the use of high refractoriness of the material and shape of sand moisture control, modeling the real fight should be to ensure the sand layer hardness, using reasonable pouring cap system and strict control of the mouth casting speed and temperature. As the technical requirements for high valve casting process than the general rough cast complex.

In addition, blank except check valve size, location accuracy and appearance, and some have as microstructure, mechanical properties, corrosion resistance and non-destructive testing and other tests, so the valve inspection process is more complex .

② valve installed on the machine parts more difficult

valve main parts of the structure, the shape is more complex, some parts are thin-walled, slender pieces, poor rigidity. In the machine tool, the positioning and clamping are more difficult, so complex and often require a special fixture.

some valve parts, the lower the accuracy of positioning the base surface, high surface roughness, and sometimes even non-machined surface orientation. The sealing surface to be machined parts such as accuracy and surface roughness requirements are high, it was difficult to ensure processing quality. Therefore, in order to meet the technology needs, the base surface is often required to improve the positioning accuracy and reduce the surface roughness, or in the non-machined surface orientation on the processing of the base surface, which increases the complexity of the valve manufacturing process.

③ machining difficult

the valve with a broad range of materials, in addition to a variety of cast iron, carbon steel, but most of its high strength, corrosion resistance and high hard cutting materials are very poor, difficult to achieve the required precision parts and surface roughness. The geometry of the valve sealing surface shape accuracy and surface roughness are very demanding and therefore more difficult to increase the valve machining. At the same time, cutting the valve material difference, and gave the valve processing methods, tool material, cutting, process equipment, so bring a lot of new problems.

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