Defects that pump valve castings may face during the casting process

During the casting process of pump valve castings, some defects may occur, which may affect the quality and performance of the castings. Common casting defects include pores, slag inclusions, local defects, shrinkage defects and surface defects.

Porosity may form inside or on the surface of the casting. Gas absorption can be reduced through appropriate gating systems and cooling measures, as well as the use of appropriate gating techniques and alloy combinations to reduce the occurrence of porosity.

Slag inclusions are another common defect caused by impurities or inclusions in the melt that pass into the casting. Quality control methods include using high-quality melt and adopting appropriate pouring and filtration techniques to reduce the possibility of slag inclusions.

Local defects refer to cracks and holes on the surface and inside of castings. The occurrence of these defects can generally be reduced by using appropriate cooling rates, suitable gating systems, and alloy design. At the same time, the use of appropriate heat treatment and heat treatment technology can also help alleviate or repair these local defects.

Shrinkage defects are caused by the shrinkage of the casting as it cools, which can lead to voids within or on the surface of the casting. Solutions include optimizing the gating system and gating process to reduce the effects of shrinkage, as well as using appropriate cooling and solidification methods.

Surface defects, such as blisters and bubbles, may affect the appearance and quality of the casting. Using high-quality sand molds and cores, as well as proper vibration and pouring techniques, are effective ways to prevent these surface defects.