Stainless Steel Casting of Valve Body

The valve body, also known as the housing, is the main component of the valve. It is the main element of the valve assembly because it is the frame that holds everything together.

Most valve bodies are cast in stainless steel. Valve bodies made of stainless steel are particularly tough and corrosion resistant, making them ideal for high pressure and high temperature applications.

The 316 stainless steel casting of the valve body is more resistant to corrosion because it contains more nickel and also contains molybdenum. This combination of iron, nickel and molybdenum makes the valve particularly resistant to chlorides and is very useful in marine environments.

 

Stainless Steel Casting of Valve Body

 

Investment casting process

YOGEM's valve bodies are produced using a stainless steel investment casting process. Compared to sand casting, investment casting of stainless steel valve bodies ensures higher dimensional accuracy, smoother surface finish and fewer casting defects. The following are the main steps of investment casting stainless steel valve bodies.

Make the mold: After the design is determined, the mold is designed and manufactured according to the drawing specifications. Please note that sometimes it is not possible to modify the mold, so it is important to confirm the design of the valve body before fabrication.

Make a wax mold: Melted wax is injected into the mold to form a wax mold, which is the same shape as the desired valve body. This can be repeated to replicate the original design.

Assembling the wax mold: The sprue is added to the wax replicas and they are joined to form a tree structure, which provides a path for the molten wax to flow out and the molten metal to fill the cavity later.

Application of embedding material: The wax tree is immersed in a silica slurry or placed in a flask and surrounded by liquid embedding plaster.

Burning: After the embedding material has dried, the flask is inverted and placed in the kiln to melt the wax, leaving the negative cavity in the shape of the original model.

Pouring: The molten model is further heated in the kiln to reduce the temperature difference with the molten metal. The metal is melted and then poured, using gravity or vacuum pressure to pull the metal into the cavity.

Demolding: Once the molten metal has cooled slightly, the molten mold is quenched in water to dissolve the refractory gypsum and release the rough casting. The gate is cut and recovered while the cast stainless steel body is cleaned to remove any signs of the casting process.

Finishing: The cast valve body is machined or sandblasted to achieve the final geometry and surface finish. Where necessary, the cast valve body is also heat treated to improve mechanical properties.

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