Bi-Metal Valve Body Casting for Fused Corrosion-Resistant Ports
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Solution Overview
Problem
Control valve components face premature failure due to stress risers from shrink fitting and unreliable mechanical stops under severe service conditions, which can lead to erosion, corrosion, and vibration, especially when temperature changes occur.
Innovation Solution
A method of forming a valve body with a ring of dissimilar material fused into the valve port using a valve core and metal port ring, where the metal ring is heated during casting to fuse with the valve body material, eliminating the need for separate inserts and mechanical stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shrink fitting is used to attach insert to valve body, then corrosion resistance is improved, but stress risers form at the juncture causing premature failure
Solution Approach 1:
The patent merges the insert and valve body into a single fused bi-metal structure where the corrosion-resistant alloy ring is directly fused to the carbon steel valve body during casting. This eliminates the separate insert attachment process and the associated stress risers at junctions, while maintaining corrosion resistance in the port area.
Solution Approach 2:
The patent replaces the mechanical shrink fit attachment system with a thermal fusion process. The metal ring is heated to a temperature where it fuses with the valve body material during casting, substituting mechanical connection with metallurgical bonding that eliminates stress concentration points.
2Ease of operation
If mechanical stops are used to retain inserts, then insert positioning is achieved, but reliability decreases under severe service conditions
Solution Approach 1:
The patent extracts and eliminates the mechanical stop component entirely. Instead of using separate mechanical retention devices, the corrosion-resistant alloy ring is fused directly into the valve body port structure, making the retention function inherent to the fused bi-metal construction itself.
3Reliability
If separate inserts and mechanical stops are used, then corrosion resistance is provided, but device complexity increases
Solution Approach 1:
The patent combines multiple separate components (valve body, insert, mechanical stops, seat rings) into a single fused bi-metal structure. The corrosion-resistant alloy ring is cast directly onto the valve body port area, eliminating the need for separate inserts and retention mechanisms, thereby simplifying the overall device structure while maintaining corrosion resistance.
4Reliability
If corrosion resistant material is applied to entire valve body, then corrosion resistance is maximized, but manufacturing cost increases
Solution Approach 1:
The patent applies corrosion-resistant material locally only to the port area where corrosion exposure is highest, rather than covering the entire valve body. The bi-metal construction features a corrosion-resistant alloy ring fused to the carbon steel valve body, providing targeted protection where needed while minimizing material costs.
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
This approach enhances durability and reduces costs by targeting corrosion resistance only where needed, providing a defect-free surface for improved sealing and eliminating the need for additional seat rings, while maintaining reliability under severe service conditions.
Implementation Method 1
the metal ring is heated during casting to fuse with the valve body material
Data Source
AI summary
A valve body having a ring of dissimilar material and a method of forming the valve body are described. The valve body includes an inlet, an outlet and a ring of dissimilar material. The method includes forming a valve core, splitting the valve core, placing a metal ring of dissimilar material between two pieces of the valve core, casting a valve body around the valve core, and fusing the metal ring to the valve body.