Flexible-Arm Metal Valve Seats for Ball Valve Sealing Reliability
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Solution Overview
Problem
Conventional ball valves face challenges in maintaining a reliable seal across varying pressure environments and tolerances due to fixed sealing pressures, leading to potential leakage issues.
Innovation Solution
The use of a metal valve seat with a flexible arm that adjusts to contact both the valve member and the valve body, providing enhanced sealing by applying a force to compensate for tolerances and maintain contact at both high and low pressure environments without the need for additional springs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed sealing pressure is used in conventional ball valves, then the valve structure is simple, but the sealing reliability deteriorates under varying pressure environments and tolerances
Solution Approach 1:
The valve seat is designed with a flexible arm portion that allows dynamic adjustment of the sealing surface position and contact pressure. The flexible arm can deflect to accommodate tolerance variations and maintain reliable sealing across different pressure environments, transforming the static sealing structure into a dynamic one that adapts to operating conditions.
Solution Approach 2:
The flexible arm portion changes the physical state of the sealing interface by introducing compliance and adjustability. This allows the sealing contact pressure and position to vary within acceptable ranges, enabling the valve to maintain sealing reliability under varying pressure conditions without requiring a completely complex active control system.
2Reliability
If additional springs are added to maintain sealing contact, then sealing performance improves, but device complexity and cost increase
Solution Approach 1:
The flexible arm portion of the valve seat serves its own sealing function without requiring external springs or additional actuating components. The flexibility of the arm itself provides the necessary compliance and contact pressure adjustment, allowing the sealing mechanism to be self-sufficient and eliminating the need for separate spring elements.
Solution Approach 2:
The sealing function and the structural support function are merged into a single integrated valve seat component with a flexible arm. This consolidation eliminates the need for separate springs and multiple discrete parts, reducing overall device complexity while maintaining sealing performance through the inherent flexibility of the unified structure.
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 configuration ensures a robust, fluid-tight seal across the valve assembly, maintaining contact between the valve seat and both the valve member and the valve body, effectively preventing leakage and enhancing sealing performance in both high and low pressure conditions.
Implementation Method 1
a flexible arm portion configured to force at least one portion of the valve seat into contact with at least one surface of the valve
Data Source
AI summary
Valve seats include a flexible arm portion configured to seal against a portion of a valve body of a valve. A ball valve may include such valve seats. Methods of forming a seal in a ball valve include forcing a first metal valve seat into sealing contact with a first end cap and a ball valve member with a first metal flexible arm member and forcing a second metal valve seat into sealing contact with a second end cap and the ball valve member with a second metal flexible arm member.