Independently Loaded Valve Packing Rings for Balanced Sealing Load
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Solution Overview
Problem
Existing control valve packing systems face challenges in reducing leakage while maintaining operational life, as increasing load on packing rings leads to uneven radial load distribution and increased friction, resulting in diminished sealing effectiveness and reduced lifespan.
Innovation Solution
The use of independently loaded packing rings, where multiple followers are nested and loaded using different springs and fasteners, allowing for balanced load distribution between the rings to enhance sealing capability and extend operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If load on packing rings is increased to reduce leakage, then sealing effectiveness is improved, but friction increases and operational life is reduced
Solution Approach 1:
The packing system is divided into multiple independently loaded packing rings (first packing ring, second packing ring) instead of using a single packing ring. Each packing ring has its own follower and spring assembly, allowing the total sealing load to be distributed across multiple rings. This segmentation reduces the friction and wear on each individual ring while maintaining the overall sealing effectiveness.
2Reliability
If load on packing rings is increased to improve sealing, then leakage is reduced, but radial load distribution becomes uneven
Solution Approach 1:
Each packing ring is equipped with its own follower and spring assembly, allowing the load to be applied locally and uniformly to each ring. The springs are positioned to apply radial loading that is evenly distributed around the circumference of each packing ring, ensuring uniform radial load distribution and preventing localized stress concentrations.
3Reliability
If multiple packing rings are used to reduce leakage, then sealing effectiveness is improved, but device complexity increases
Solution Approach 1:
The packing rings and their associated followers are arranged in a nested configuration within the bonnet bore. The first follower is disposed at least partially within the bore of the bonnet, and the second follower is disposed at least partially within the bore of the first follower. This nesting arrangement allows multiple independent loading mechanisms to be accommodated in a compact space, reducing the overall complexity of the assembly process and the spatial requirements.
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 approach results in improved sealing performance and extended lifespan of the packing system by balancing loads between packing rings, reducing leakage and wear, while maintaining a tighter seal without compromising operational life.
Implementation Method 1
coupled to a first surface of a first spring disposed in the valve bonnet
Data Source
AI summary
A valve packing having independently loaded packing rings is disclosed. A packing assembly for a fluid valve includes a first packing ring, a first follower to be disposed at least partially within a bore of a bonnet of the fluid valve to apply a first load to the first packing ring, a second packing ring sized to fit within a bore of the first follower, and a second follower to be disposed at least partially within the bore of the first follower to apply a second load to the second packing ring within the bore of the first follower.