Modular Valve Trim Assembly for Fewer Leakage Paths
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Solution Overview
Problem
Conventional control valves have complex assembly processes due to numerous individual trim components, leading to manufacturing and assembly concerns such as tolerance stack-ups, increased variability, and potential leakage, which complicates the assembly and increases the likelihood of service requirements over the valve's lifetime.
Innovation Solution
The implementation of modular valve trim assemblies, where the bonnet is formed as a single-piece component with integral features like a cage and seat, reducing the number of individual components and allowing for unitary assembly and replacement, thereby simplifying the assembly process and reducing potential leakage paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional control valves use numerous individual trim components, then the valve can be serviced and repaired by replacing individual components, but the assembly process becomes complex and time-consuming with increased tolerance stack-ups and variability
Solution Approach 1:
The valve trim is segmented into modular assemblies (e.g., cage and seat as one module, plug and stem as another) that can be independently manufactured and then assembled. This reduces the number of individual components while maintaining serviceability, as entire modules can be replaced rather than individual tiny components.
Solution Approach 2:
Certain trim components are merged into integral assemblies (e.g., cage with seat, bonnet with trim components) to reduce the total number of parts. This simplifies the assembly process and reduces tolerance stack-ups while allowing modular replacement of entire assemblies for repair purposes.
2Adaptability or versatility
If conventional control valves use numerous individual trim components, then each component can be optimized for its specific function, but the manufacturing and assembly time increases significantly
Solution Approach 1:
Modular trim assemblies are pre-assembled and pre-tested outside the main valve assembly process. This preliminary action allows for functional optimization of each module while significantly reducing the time required for final valve assembly, as entire optimized modules are installed as units rather than assembling numerous individual components on-site.
3Ease of repair
If conventional control valves use numerous individual trim components, then replacement of specific components is possible, but the number of potential leakage paths increases
Solution Approach 1:
Multiple trim components are merged into integral assemblies with fewer interfaces (e.g., cage and seat as one piece, bonnet integrated with trim). This reduces the number of potential leakage paths at interfaces while maintaining the ability to replace entire assemblies for repair, thereby improving reliability without sacrificing serviceability.
Data Source
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AI summary
Modular valve trim assemblies for control valves are disclosed. In some examples, a first modular valve trim apparatus includes a bonnet and a cage coupled to the bonnet. In some examples, the cage has an integral seat. In some examples, a second modular valve trim apparatus includes a single-piece bonnet including an integral cage and an integral seat. In some examples, the second modular valve trim apparatus includes a plug irremovably located within the single-piece bonnet.