CF8 Investment Casting of Valve Body

Investment Casting Overview

Investment casting is a process that dates back over 5,000 years and remains its application in modern manufacturing. This technique involves creating a wax pattern, which is an exact replica of the desired part. The pattern is coated with a refractory ceramic material to form a mold. Once the ceramic material hardens, the wax is melted out, leaving a hollow cavity in the shape of the part. Molten metal is then poured into this cavity. After the metal solidifies, the ceramic shell is broken away to achieve the final cast part.

This process is known for its ability to produce components with exceptional surface finishes, complex geometries, and dimensional accuracy. Investment casting is particularly advantageous for producing valve parts that would be difficult or impossible to create through traditional manufacturing methods.

Valve Body Investment Casting Process

Valve Body Investment Casting Process

Valve bodies are central components in valve systems, designed to house the internal parts that control the flow of fluids or gases. The valve body investment casting process begins with the creation of a detailed wax model. These models are often produced using high-precision injection molding, ensuring accuracy and repeatability. After the wax models are produced, they are assembled onto a wax tree, allowing multiple parts to be cast together.

The wax tree is then dipped into a ceramic slurry, followed by the application of a stucco material. This process is repeated multiple times to build up a strong ceramic shell. Once the shell dries, it undergoes a de-waxing process where the wax is melted out, creating a cavity that mirrors the valve body’s geometry.

Molten stainless steel, specifically CF8, is then poured into the pre-heated ceramic mold. The metal solidifies within the mold, adopting the intricate shapes and fine details of the valve body design. After cooling, the ceramic shell is carefully removed, leaving the metal valve body.

The cast parts undergo various finishing processes, including heat treatment, machining, and surface finishing, to meet the exact specifications required for valve bodies.

Valve Body Casting Material: CF8 Stainless Steel

CF8 Stainless Steel Composition

Element Composition (%)
Chromium 18-20
Nickel 8-11
Manganese ≤ 2.00
Silicon ≤ 1.50
Carbon ≤ 0.08
Sulfur ≤ 0.03
Phosphorus ≤ 0.045

CF8 is a widely used austenitic stainless steel casting grade, particularly in valve body investment casting. Its primary alloying elements are chromium and nickel, providing a balanced combination of corrosion resistance and strength. This steel exhibits excellent welding and forming characteristics and retains its strength even at high temperatures.

The high chromium content imparts significant corrosion resistance, making CF8 an ideal choice for valve bodies in aggressive environments. The nickel content enhances the overall ductility and toughness of the alloy. CF8’s composition ensures that the final valve bodies can withstand harsh conditions, including exposure to corrosive fluids and high-pressure applications.

Why Investment Casting for Valve Body?

Investment casting is particularly suitable for valve bodies due to several reasons:

Precision and Complexity

Valve bodies often have complex shapes with intricate internal passages. Investment casting can accurately reproduce these features, maintaining tight tolerances and high dimensional accuracy.

Material Versatility

The process allows for a wide range of materials, including CF8 stainless steel, which is known for its corrosion resistance and mechanical properties.

Surface Finish

Investment casting produces parts with excellent surface finishes, reducing the need for secondary machining and finishing processes.


For medium to high-volume production, investment casting offers a cost-effective solution. The process minimizes material waste and reduces labor costs associated with machining and fabrication.

Design Flexibility

Designers have the freedom to incorporate complex geometries and design elements into valve bodies without the limitations of traditional manufacturing methods.

These factors make investment casting an ideal method for producing high-quality, durable valve bodies that meet stringent industry standards.

Other Valve Components by Investment Casting

Investment casting is not only used for valve bodies but also for manufacturing various other valve components:

  • Valve Disc: This component controls the flow of fluid. Precision casting allows for the creation of aerodynamic profiles and complex shapes, ensuring efficient flow control.
  • Valve Bonnet: The bonnet acts as a cover on the valve body. Investment casting ensures a leak-proof fit and allows for complex internal threading.
  • Valve Pump: Components of valve pumps, such as impellers and housings, benefit from the dimensional accuracy and excellent surface finish offered by investment casting.

These components, like the valve body, can be made from various materials, including CF8 stainless steel, to ensure durability and resistance to corrosive environments.

Valve Casting Services in CFS Foundry

CF8 Investment Casting of Valve Body

CFS Foundry is a leading investment casting company, specializing in the production of high-quality valve components. We offer a comprehensive suite of services from design assistance to final production. Utilizing advanced technology and rigorous quality control measures, CFS Foundry ensures that each valve component meets exacting standards.

Our expertise in working with a variety of materials, including CF8 stainless steel, enables us to meet different industry requirements. CFS Foundry’s commitment to precision and quality, combined with our extensive experience, makes us a preferred choice for valve casting needs.

Any inquiry on investment casting of valve body or other custom parts, pls send us your drawings & 3d files to Our team will go back to you for a quick free quote within 24 hours!

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