Common roughcast used in valve machining includes castings, forgings, profiles and welding.Different types, roughness and hardness of the roughcast have a direct impact on the process of valve machining.
The factors should be considered when selecting roughcast as below:
The material of the assembling and the organization and performance requirements.
The materials on the drawing, in general, determine the roughcast type. For example, the material of the parts is the cast iron, it must be made by casting.
Structure and Size: The valve body with complicated structure and shape should adopt castings. The large size valve would accept sand casting, and investment casting should be used in small size.
Conditions for roughcast manufacturing: The selection of roughcast should be based on the scene of the equipment and the level of technology, and gradually adopted advanced roughcast manufacturing methods with considering the development prospects.