Plug Valve Seal Boss Limits Elastomer Deformation
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Solution Overview
Problem
Existing fluid control valves with metal-to-metal seals in plug valves require precise segment formation to achieve a reliable seal, leading to increased manufacturing time and costs due to tolerance issues and plug shifting during operation.
Innovation Solution
The implementation of an elastomeric seal with a metal annular boss on the outer surface of segments, which enhances metal-to-metal sealing by limiting elastomeric seal deformation and providing a consistent contact area, thereby improving sealing performance under varying pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If segments are formed with high precision to achieve reliable metal-to-metal sealing, then sealing performance is improved, but manufacturing time and cost increase
Solution Approach 1:
The invention changes the sealing mechanism from direct metal-to-metal contact to elastomeric seal contact. The elastomeric seal material deforms under pressure to create a reliable seal, eliminating the need for precise segment formation tolerances. This parameter change from rigid metal contact to flexible elastomeric contact resolves the contradiction by maintaining sealing performance while reducing manufacturing precision requirements.
Solution Approach 2:
The invention uses composite materials by combining metal segments with elastomeric seal material. The metal provides structural integrity while the elastomeric material provides the sealing function. This composite approach allows the metal segments to be manufactured with relaxed tolerances while the elastomeric seal ensures reliable sealing, thus improving productivity without sacrificing sealing performance.
2Reliability
If segments are formed with high precision to achieve reliable metal-to-metal sealing, then sealing performance is improved, but manufacturing cost increases
Solution Approach 1:
The invention changes the sealing mechanism from direct metal-to-metal contact to elastomeric seal contact. The elastomeric seal material deforms under pressure to create a reliable seal, eliminating the need for precise segment formation tolerances. This parameter change from rigid metal contact to flexible elastomeric contact resolves the contradiction by maintaining sealing performance while reducing manufacturing precision requirements.
Solution Approach 2:
The invention uses composite materials by combining metal segments with elastomeric seal material. The metal provides structural integrity while the elastomeric material provides the sealing function. This composite approach allows the metal segments to be manufactured with relaxed tolerances while the elastomeric seal ensures reliable sealing, thus improving productivity without sacrificing sealing performance.
3Adaptability or versatility
If elastomeric seal is allowed to deform freely, then sealing adaptability is improved, but metal-to-metal sealing consistency deteriorates
Solution Approach 1:
The invention applies local quality by creating a dedicated metal annular boss structure at the specific location where metal-to-metal sealing occurs. This localized metal structure provides a consistent sealing surface while the surrounding elastomeric seal material maintains its adaptability. The boss structure ensures that the metal-to-metal sealing interface remains consistent regardless of plug position variations, thus resolving the contradiction between adaptability and consistency.
Solution Approach 2:
The invention segments the sealing function into two distinct zones: the metal annular boss provides the consistent metal-to-metal sealing interface, while the elastomeric seal material provides the adaptive sealing against the recess. This segmentation of sealing functions allows each material to optimize its specific role, resolving the contradiction between adaptability and consistency.
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 enhances metal-to-metal sealing ability at high pressures, reduces leakage sensitivity, and simplifies manufacturing by reducing the need for precise segment alignment, resulting in improved operational reliability and cost-effectiveness.
Implementation Method 1
An elastomeric seal seals the outer side of each segment to the recess and exerts an inward force on the segment to cause the metal-to-metal sealing
Implementation Method 2
The annular boss contacts the recess to limit the deformation of the elastomeric seal within its groove
Data Source
AI summary
A fluid control valve utilizes a rotatable plug valve member mounted in a fluid passage to control the flow of fluids. Two segments are placed on each side of the plug valve member within a recess located between the plug valve member and the body of the fluid passage. The outer surface of the segments includes an elastomeric seal and metal annular boss, which acts as a stop to limit deformation of the seal when the valve is closed and under pressure.