Cryogenic Globe Valve With 3D Resin Disk Seat Alignment
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Solution Overview
Problem
Conventional cryogenic globe valves face issues with high sealing property loss due to thermal contraction and material differences, leading to misalignment and reduced durability, especially when handling liquefied hydrogen, which results in back leakage and maintenance challenges.
Innovation Solution
A cryogenic globe valve design featuring a resin-made valve disk with a conical surface and a through hole in the stem, allowing for three-dimensional operation and alignment correction, along with a bellows structure for enhanced sealing and leak detection, reduces the number of components and ensures high sealing performance even under extreme temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin-made valve disk is used to prevent hydrogen embrittlement, then reliability is improved, but thermal contraction causes misalignment and sealing performance deteriorates
Solution Approach 1:
The patent changes the material parameter from metal to resin for the valve disk to eliminate hydrogen embrittlement. The resin material undergoes thermal contraction at cryogenic temperatures, which is the root cause of the alignment issue. This parameter change resolves the reliability issue but introduces the precision problem.
Solution Approach 2:
The patent introduces an asymmetric adjustment mechanism where the valve disk can be independently positioned relative to the stem. The adjusting device allows asymmetric correction of the valve disk's position to compensate for thermal contraction, enabling the disk to realign with the valve seat despite the asymmetric thermal shrinkage of the resin material.
2Stability of the object's composition
If the valve disk is firmly fixed to the stem, then structural stability is improved, but thermal contraction causes stress concentration and reduces durability
Solution Approach 1:
The patent transforms the static fixed connection between valve disk and stem into a dynamic adjustable connection. The adjusting device allows the valve disk position to be modified, creating a dynamic system that can adapt to thermal contraction. This dynamic capability prevents stress concentration while maintaining operational stability.
Solution Approach 2:
The patent incorporates an adjustment mechanism that allows pre-compression or pre-positioning of the valve disk before thermal contraction occurs. By adjusting the position in advance or compensating for the expected contraction, the system cushions against the stress that would otherwise concentrate at the fixed connection points, extending the valve disk's service life.
3Reliability
If multiple components are used for fixing the valve disk, then attachment reliability is improved, but device complexity increases and maintenance becomes difficult
Solution Approach 1:
The patent merges the fixing function and the adjusting function into a single integrated adjusting device. This single component performs both attachment and position adjustment, eliminating the need for separate fixing mechanisms. The merging reduces the number of components while maintaining or even improving attachment reliability through the combined functionality.
Solution Approach 2:
The adjusting device serves multiple functions: it fixes the valve disk to the stem, allows position adjustment to compensate for thermal contraction, and provides a means for maintenance and replacement. This multi-functional design eliminates the need for multiple specialized components, simplifying the overall device structure while enhancing reliability.
4Manufacturing precision
If the valve disk is allowed to move freely, then alignment correction is improved, but control precision and sealing consistency deteriorate
Solution Approach 1:
The patent implements a controlled mobility system where the valve disk can move within specific parameters but is constrained within acceptable tolerances. The adjusting device provides dynamic adjustment capability while maintaining control precision through defined adjustment ranges and stopping mechanisms, ensuring sealing consistency is not compromised.
Solution Approach 2:
The patent changes the degree of freedom parameter from completely fixed to controlled movable. The valve disk is allowed to move within a controlled range to achieve alignment correction, but the movement is limited to prevent excessive displacement that would compromise sealing accuracy. This parameter optimization balances alignment correction with sealing 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 design maintains high sealing performance over numerous cycles, prevents back leakage, and simplifies maintenance by allowing the resin-made valve disk to operate freely and align correctly with the valve seat, reducing stress and extending the valve's lifespan.
Implementation Method 1
an upper part of the axial cylindrical portion is made to have a bellows structure
Implementation Method 2
the resin-made valve disk is three-dimensionally operable with respect to the stem even under an extremely low-temperature condition
Data Source
AI summary
A cryogenic globe valve that prevents a high sealing property and safety from being lost even through a large number of times of opening and closing for a cryogenic fluid and is easily maintained, although it has a simple structure. The cryogenic globe valve has an axial cylindrical portion as a long-neck structure extended to its body, in which a resin-made valve disk having a conical surface having a reduced-diameter tapered shape is attached to a lower end of an elongated stem such that the resin-made valve disk is three-dimensionally operable with respect to the stem even under an extremely low-temperature condition.