Corrosion-Resistant Valve Body Casting With 3D-Printed Internal Lining
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Solution Overview
Problem
Control valve components, particularly valve bodies, are susceptible to corrosion, which can compromise their characteristics and affect the quality of the end product, with existing solutions being costly or time-intensive, such as manufacturing the entire valve body from corrosion-resistant materials or welding layers onto casted valve bodies.
Innovation Solution
A method involving a casting process where a corrosion-resistant material is applied to the internal surfaces of a valve body using additive manufacturing during the sand casting process, ensuring that the internal surfaces of the valve body are made of a more corrosion-resistant material, reducing the need for extensive use of expensive materials and complex welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire valve body is manufactured from corrosion-resistant material, then corrosion resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by using corrosion-resistant material only on the internal surfaces of the valve body that are exposed to corrosive process fluids, rather than manufacturing the entire valve body from corrosion-resistant material. This is achieved through a lining or coating approach where the corrosion-resistant layer is applied selectively to the interior surfaces, reducing material consumption while maintaining corrosion resistance where needed.
Solution Approach 2:
The patent employs composite materials by combining a structural material (for the valve body) with a corrosion-resistant material (for the internal lining). This creates a composite structure where each material performs its optimal function - the structural material provides mechanical strength while the corrosion-resistant material provides protection against chemical degradation, achieving both durability and cost-effectiveness.
2Reliability
If a layer of corrosion-resistant material is welded onto the internal surfaces of a casted valve body, then corrosion resistance is improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent extracts the welding operation from the manufacturing process by replacing it with an alternative method of applying corrosion-resistant material, such as lining, coating, or cladding techniques. This removes the complexity associated with welding equipment and skilled welders while achieving the same corrosion protection goal through a simpler, more accessible process.
Solution Approach 2:
The patent substitutes the mechanical welding process with a different material application method, such as thermal spraying, chemical vapor deposition, or physical vapor deposition. This replacement eliminates the need for complex welding equipment and highly skilled operators, reducing manufacturing complexity while maintaining or improving corrosion resistance.
3Reliability
If welding is used to apply corrosion-resistant material on complex internal profiles, then corrosion resistance is improved, but manufacturing precision deteriorates due to imperfections
Solution Approach 1:
The patent replaces the welding process with alternative material application techniques such as thermal spray coating, plasma spraying, or chemical vapor deposition. These methods can more uniformly coat complex internal profiles without creating weld imperfections, thereby improving manufacturing precision and surface quality while maintaining corrosion resistance.
Solution Approach 2:
The patent changes the process parameters from welding (high heat, mechanical fusion) to coating/deposition processes (controlled temperature, uniform layer formation). This parameter change enables better control over the thickness and uniformity of the corrosion-resistant layer on complex geometries, reducing surface imperfections and improving overall manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively increases the corrosion resistance of valve body internal surfaces, reducing maintenance needs and extending the service life of control valves while minimizing costs and imperfections associated with traditional methods.
Implementation Method 1
forming a layer of a second material (that has a higher corrosion resistance than the first material) on one or more internal surfaces of the valve body casting by applying, using an additive manufacturing technique, the second material to or on one or more externals surface of a core
Data Source
AI summary
A method of manufacturing a valve body having one or more corrosion-resistant internal surfaces. The method involves performing a casting process, which includes pouring a first material into a mold box, to produce a valve body casting made of the first material. During the casting process, a layer of a second material is formed on one or more internal surfaces of the valve body casting, the second material having a higher corrosion resistance than the first material, by: (1) applying, with an additive manufacturing technique, the second material to one or more external surfaces of a core, and (2) inserting the core into the mold box. A portion of the first material binds to the second material on the one or more external surfaces of the core while the first material is poured into the mold box.