Control Valve Guide-and-Seat Insert Design
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Solution Overview
Problem
Existing control valves face challenges in accessing and replacing the valve seat, especially in large valves with high-volume liquid flow, where rapid wear occurs due to drag forces, and require enhanced mechanical support for the valve plug without complicating the structure or maintenance.
Innovation Solution
A control valve design integrates a valve seat and plug guides as a guide-and-seat insert with a collar and bolts for accessible attachment, providing a three-point support system using angularly spaced plug guides and a replaceable peripheral strip, along with a flexible diaphragm actuator and supplementary actuator for improved support and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve seat is manufactured separately and attached to the valve body, then the valve seat can be made from wear-resistant material and replaced when worn, but access to the valve seat becomes awkward making attachment or replacement problematic
Solution Approach 1:
The valve assembly is segmented into modular components: the valve body, the plug assembly, and the guide-and-seat insert. This segmentation allows the guide-and-seat insert to be independently accessed and replaced without disassembling the entire valve, improving accessibility while maintaining wear resistance.
Solution Approach 2:
The guide-and-seat insert acts as an intermediary component that bridges the valve body and the plug. By making this insert removable as a complete unit, it serves as a mediator that can be easily accessed and replaced, solving the accessibility problem while preserving the wear-resistant seating surface.
2Ease of operation
If linear bearings are used to support the valve plug, then the plug can be supported along its range of motion, but rapid wear occurs due to drag forces from high-volume liquid flow
Solution Approach 1:
The patent replaces the traditional linear bearing support system with a guide surface system formed by the plug guides. Instead of using bearing elements that are subject to rapid wear from high-velocity liquid drag, the design uses a simple guide surface that directs the plug's motion, significantly reducing wear while maintaining support functionality.
Solution Approach 2:
The support mechanism changes from a bearing-based system to a guide-surface-based system. This parameter change in the support approach eliminates the use of bearing elements that wear rapidly under high-flow conditions, while still providing adequate support for the plug's range of motion through the angularly spaced plug guides.
3Reliability
If multiple plug guides are deployed to provide three-point support for the plug, then mechanical support is enhanced, but the structure becomes more complex
Solution Approach 1:
The guide-and-seat insert merges multiple functions into a single integrated component: it provides the valve seat, multiple plug guides for three-point support, and structural attachment to the valve body. This consolidation enhances mechanical support through multiple guides while avoiding the complexity of separate components for each function.
Solution Approach 2:
The guide-and-seat insert is designed as a universal component that simultaneously performs multiple functions: sealing (valve seat), guiding (multiple plug guides for three-point support), and structural support. This multi-functionality provides enhanced mechanical support without increasing overall device complexity, as all functions are integrated into one removable unit.
Data Source
Figure 1A~1B
Figure 2~4
Figure 5A~5B
AI summary
A control valve for regulating flow of fluids has an actuator located in a control chamber connected to a valve body. The valve body defines a flow passageway passing through an opening. A plug is associated with the actuator such that movement of the actuator from a rertacted position towards an extended position displaces the plug towards the opening. The valve also includes a guide-and-seat insert which proivdes a valve seat interconnected with an attachment collar via a number of plud guides. When the plug is displaced b the actuator, the plug slides in contact with at least two of the plug guides. When the actuator moves to its extended position, the plug closes against the closure surface of the valve seat so as to block the passage of fluid from an inlet to an outlet of the valve.