Structural features of nickel-chromium pump valve castings

Structural features of nickel-chromium pump valve castings :

1) In order to prevent the formation of coarse grains, thick sections and local metal accumulation should be avoided as much as possible. In the process, metal-type pump valve castings and the like can also be used to refine the crystal grains.

2) In order to reduce the casting stress and prevent thermal cracking, the wall thickness should be as uniform as possible and the transition should be smooth. The nickel-chromium stainless steel valve body 1 has a gate 2 and a riser 3 to avoid the protruding portion of the casting shrinkage. From the standpoint of preventing oxide film and generating inclusions, it is also desirable to have a smooth transition without causing turbulence.

3) For some stainless steel castings (such as pump body, valve body, etc.) with high air tightness requirements and high pressure, the structure should be designed according to the principle of solidification to ensure the feeding effect. For example, some thicker pump-valve castings (http://) have a wall thickness that is designed to have a certain slope so that the thicker it is near the flange. The riser is arranged on the flange, and the cold iron is placed on the valve seat, so that the order solidification can be formed, so that the riser can effectively replenish the parts of the valve body to avoid shrinkage and ensure good airtightness.