Bidirectional Valve Seal Assembly with Spacer Ring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bidirectional seal assemblies for valves face issues with leakage due to wear and manufacturing tolerances, leading to increased friction and potential damage to valve components, especially when spacer rings made of metal engage with the cage surface.
Innovation Solution
A seal assembly comprising a first and second seal, with a spacer ring positioned between them to prevent contact, and a retaining ring to maintain the assembly's position, utilizing spring-loaded seals and a spacer ring made of materials like thermoplastic or metal to prevent wear and damage, ensuring the seals remain spaced and functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal spacer rings are used to maintain seal spacing, then wear resistance of the spacer ring is improved, but the cage surface may be marked or damaged, causing leakage and reducing cage life
Solution Approach 1:
The patent introduces a cage protector as an intermediary component between the metal spacer ring and the cage surface. The cage protector is made of a softer material that prevents direct contact between the hard metal spacer ring and the cage surface, thereby eliminating the harmful effect of surface marking or damage while maintaining the spacing function. This mediator absorbs the potential harm without compromising the structural integrity or sealing performance.
2Reliability
If the spacer ring is sized to provide clearance between the spacer ring and cage surface, then leakage prevention is improved, but friction increases when the spacer ring contacts the cage surface during valve operation
Solution Approach 1:
The cage protector serves as a mediator that eliminates direct contact between the spacer ring and cage surface during valve operation. By placing this intermediate layer, the system maintains the necessary clearance for leakage prevention while the cage protector absorbs any contact forces, thereby eliminating the harmful friction that would otherwise occur between the spacer ring and cage surface.
Solution Approach 2:
The patent converts the potential harmful contact between the spacer ring and cage surface into a beneficial arrangement by introducing the cage protector. The slight contact or proximity that would normally cause friction is transformed into a controlled interaction where the cage protector manages the contact, converting what would be a harmful friction force into a protected, low-friction interface that extends component life.
3Device complexity
If opposing seals are placed close together in the seal gland, then device complexity is reduced, but the seals may contact each other during valve operation, increasing friction and wear
Solution Approach 1:
The spacer ring acts as an intermediary element positioned between the opposing seals in the seal gland. It maintains an optimal spacing that prevents the seals from contacting each other during valve operation, thereby eliminating the harmful friction and wear that would reduce seal life. The spacer ring is sized to provide this critical clearance without excessively increasing the overall seal gland dimensions or device complexity.
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 solution effectively reduces leakage and extends the life of valve components by maintaining seal spacing, minimizing friction, and preventing damage to the cage surface, thereby improving the shut-off classification and operational reliability of the valve.
Implementation Method 1
spring-loaded seals
Implementation Method 2
increasing friction between the closure member or the seal assembly and the cage
Data Source
AI summary
Bi-directional seal assemblies for use with valves are described. An example apparatus for use with a fluid valve includes a closure member disposed between an inlet and an outlet of a fluid flow passageway of the fluid valve. The closure member is to slide relative to a cage or a valve body, wherein the closure member includes a seal gland and a passageway in fluid communication with the seal gland, the passageway to fluidly couple the seal gland and the fluid flow passageway of the fluid valve. The apparatus further includes a seal assembly positioned in the seal gland, the seal assembly including a first seal, a second seal opposite the first seal, and a spacer ring disposed between the first and second seals.