Reinforced Rotary Valve Seal Assembly for High-Pressure Leak Stability
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Solution Overview
Problem
Existing seal assemblies for rotary valves become unstable and deform at high pressure differentials, leading to internal leaks and loss of sealing effectiveness.
Innovation Solution
A reinforced seal assembly comprising a hard sealing structure made from a rigid material, such as thermoplastic polyphthalamide or polyphenylene sulfide, and a soft sealing structure made from a resiliently deformable material, such as elastomeric materials, which work together to maintain stability and prevent deformation under varying pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft sealing element made from elastomeric material is used to seal between the plug and valve body, then the sealing element can be compressed to maintain sealing effect, but the sealing element becomes unstable and deforms at high pressure differentials greater than 50,000 Pa
Solution Approach 1:
The patent applies composite materials by combining a hard sealing structure made from rigid material (such as PPS or PPA) with a soft sealing structure made from elastomeric material. The hard structure provides stability and resistance to high pressure differentials, while the soft structure provides compliance and sealing effectiveness through compression, resolving the contradiction between sealing effectiveness and stability at high pressures.
Solution Approach 2:
The sealing element is divided into two distinct structures: a hard sealing structure and a soft sealing structure. Each structure performs a different function - the hard structure maintains geometric stability under pressure, while the soft structure provides the sealing contact force, thereby resolving the instability issue of single-material sealing elements at high pressure differentials.
2Reliability
If a soft sealing element is compressed between the valve body and plug to ensure sealing, then sealing effect is maintained regardless of rotational position, but deformation occurs at high pressure differentials leading to internal leaks
Solution Approach 1:
By using composite materials (hard rigid material combined with soft elastomeric material), the sealing assembly maintains fluid-tight seal through the soft structure's compression capability while the hard structure prevents deformation-induced internal leaks at high pressure differentials.
Solution Approach 2:
Different parts of the sealing assembly have different material properties optimized for their specific functions: the hard sealing structure provides structural stability and pressure resistance, while the soft sealing structure provides localized compliance and sealing contact, preventing internal leaks without sacrificing sealing effectiveness.
3Device complexity
If a single-material sealing element is used, then the structure is simple, but the sealing element becomes unstable and deforms at high pressure differentials
Solution Approach 1:
The patent uses composite materials consisting of a hard sealing structure (rigid material like PPS or PPA) and a soft sealing structure (elastomeric material). This composite approach provides the necessary stability at high pressure differentials while maintaining a relatively simple overall sealing assembly structure that can be manufactured as an integrated unit.
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 proposed seal assembly provides a stable and effective sealing solution that maintains fluid-tight integrity even at high pressure differentials, preventing deformation and internal leaks, and ensuring reliable operation of the rotary valve.
Implementation Method 1
a second sealing structure configured to sealingly engage the first sealing structure and the valve body... wherein the second sealing structure is formed from a resiliently deformable material
Data Source
AI summary
A rotary valve includes a valve body including an opening formed therein, a rotary component received within the opening of the valve body with the rotary component configured to rotate relative to the valve body about an axis of rotation thereof, and a sealing assembly including a hard sealing structure and a soft sealing structure disposed between the valve body and the rotary component. The hard sealing structure is formed from a substantially rigid material and is configured to sealingly engage the rotary component. The hard sealing structure includes a support feature to reinforce the soft sealing structure. The soft sealing structure is formed from a resiliently deformable material and is configured to sealingly engage the hard sealing structure and the valve body.