It is the process of melting the metal into a liquid that meets certain requirements and pouring it into the casting mold. After cooling and solidification, the casting (part or blank) with predetermined shape, size and performance can be obtained after cooling and solidification.The generally cast valve pressure level is low (e.g., PN16, PN25, PN40, but also high pressure, up to 1500 LB,2500 LB), with a large diameter of most DN50.
The blank produced by casting has low cost and can show its economy for parts with complex shape, especially for parts with complex inner cavity. At the same time, it has wide adaptability and good comprehensive mechanical properties.
However, there are more materials (such as metal, wood, fuel, molding materials, etc.) and equipment (such as smelting furnace, sand mixer, molding machine, core-making machine, sand dropping machine, shot blasting machine, cast iron plate, etc.), and will produce dust, harmful gases and noise and pollute the environment.
Molten liquid metal fills the cavity to cool. It is easy to produce pores in the middle of parts.