Flexible Seal Insert for Rotary Valve Leakage Control
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Solution Overview
Problem
Control valves, such as butterfly valves, face challenges in maintaining adequate sealing due to temperature fluctuations and vibrations, which can lead to leakage issues.
Innovation Solution
A flexible seal insert system comprising a retainer ring, a seal carrier ring with an annular mounting flange, and a resilient seal insert, where the mounting flange and flexible portion are integrally formed, and the seal carrier cartridge is coupled to the flexible portion using a laser weld, with materials like PTFE or strain-hardened stainless steel, allowing for resilient geometry and motion to accommodate environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional O-ring seal is used in a butterfly valve, then the sealing structure is simple and easy to manufacture, but the sealing reliability deteriorates under temperature fluctuations and vibrations
Solution Approach 1:
The seal carrier ring is divided into distinct functional segments: a mounting flange for structural support, a flexible portion for vibration absorption, and a seal carrier cartridge for seal retention. This segmentation allows each component to be optimized for its specific function while working together to provide reliable sealing under varying conditions.
Solution Approach 2:
The flexible portion of the seal carrier ring is designed to dynamically respond to vibrations and temperature fluctuations by flexing and deforming elastically. This dynamic capability allows the seal to maintain contact with the valve seat while absorbing mechanical stresses, thereby maintaining sealing reliability without requiring a complex rigid structure.
2Adaptability or versatility
If a rigid seal structure is used, then the seal maintains its shape and positioning, but it cannot accommodate temperature fluctuations and vibrations, leading to leakage
Solution Approach 1:
The flexible portion is constructed as a thin-walled elastic structure that can deform under thermal and mechanical loads. This flexible shell design allows the seal carrier ring to adapt to temperature fluctuations and vibrations while maintaining the structural integrity needed to support the sealing function.
Solution Approach 2:
The seal system combines materials with different properties: the flexible portion uses elastic materials for adaptability, while the seal insert uses PTFE or similar materials for low friction and chemical resistance. This composite approach allows the system to simultaneously achieve adaptability to environmental changes and stable sealing geometry.
3Ease of manufacture
If the seal carrier ring is made from a single rigid material, then manufacturing is simplified, but the seal cannot accommodate motion and environmental variations
Solution Approach 1:
The seal carrier ring utilizes parameter changes in material properties through heat treatment processes. The flexible portion is strain-hardened to achieve specific elastic properties while maintaining manufacturability. This allows the component to be produced using standard manufacturing techniques while achieving the desired resilient characteristics for adapting to environmental changes.
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 flexible seal insert system provides a reliable and durable sealing solution that maintains tight shutoff even under pressure and temperature variations, offering resistance to degradation and erosion, and functions as a secondary seal until maintenance or replacement is necessary.
Implementation Method 1
a flexible portion coupling the seal carrier cartridge to the mounting flange... allowing for resilient geometry and motion to accommodate environmental changes
Implementation Method 2
the seal carrier cartridge is coupled to the flexible portion using a laser weld
Data Source
AI summary
A rotary valve includes a valve body with an inlet, an outlet, a flow passage extending between the inlet and the outlet, and a rotating control element disposed within the valve body for selectively opening and closing the flow passage. The valve also includes a retainer ring mountable to the valve body which holds in place a seal carrier ring having an annular mounting flange mounted between the valve body and the retainer ring. The seal carrier ring also includes a seal carrier cartridge and a flexible portion coupling the seal carrier cartridge to the mounting flange to provide an improved seal and greater ease of assembly.