Pressure-Balanced Valve Plug With Self-Aligning Valve Seat
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Solution Overview
Problem
Pressure-balanced fluid valve plugs made from hard materials require precise alignment with the valve housing, and existing solutions fail to effectively manage axial and radial movement of the valve seat to ensure proper sealing and alignment, especially when dealing with out-of-round valve rings.
Innovation Solution
A valve plug design featuring a stem with a tip and plug body, where the valve seat allows radial movement to align with the valve ring, and includes a seal for limited axial movement, fluid passages for pressure balancing, and a resilient sealing surface to conform to the valve ring, ensuring proper alignment and sealing without excessive friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the valve seat is made fixed relative to the stem, then the structural complexity is reduced, but the alignment with out-of-round valve rings cannot be achieved
Solution Approach 1:
The valve seat is designed to move dynamically relative to the stem, transitioning from a fixed position to a movable one. The annular space allows the valve seat to shift radially and axially to align with out-of-round valve rings during operation, while appearing fixed in the assembled configuration. This dynamic adjustment resolves the contradiction by enabling precision alignment without requiring complex pre-adjustment mechanisms.
2Reliability
If the valve seat sealing surface is made resilient, then the sealing capability with out-of-round valve rings is improved, but the structural complexity increases
Solution Approach 1:
The valve seat sealing surface is made resilient by changing the material parameter from rigid to elastic. This allows the sealing surface to deform and conform to out-of-round valve rings, ensuring reliable sealing. The resilience is achieved through material selection rather than complex structural modifications, resolving the contradiction by improving sealing capability without significantly increasing device complexity.
3Manufacturing precision
If the valve seat is restrained from axial movement, then the structural simplicity is maintained, but the radial alignment movement is compromised
Solution Approach 1:
The valve seat movement is segmented into two independent components: axial movement is restrained by the seal between the valve seat and plug body, while radial movement is permitted through the annular space. This segmentation allows the valve seat to align radially with out-of-round valve rings while maintaining axial positioning stability, resolving the contradiction by providing precise radial alignment without complex constraint mechanisms.
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 facilitates easy assembly and disassembly, reduces friction, and ensures a secure seal even with out-of-round valve rings, improving the alignment and operational efficiency of pressure-balanced fluid valves.
Implementation Method 1
the sealing surface of the valve seat may be sufficiently resilient to sealingly conform to an out-of-round valve ring
Data Source
AI summary
A plug for a fluid valve has a stem extending along an axis between a first end and a second end, a tip secured to the first end of the stem, a plug body mounted to the stem toward the second end relative to the tip, and a valve seat between the tip and the plug body. The valve seat has a sealing surface that extends past an outer perimeter of the tip and is sized to engage a valve ring of the fluid valve, the valve seat defining an annular space that permits radial movement of the valve ring relative to the axis of the stem to align with the valve ring as pressure is applied to the valve seat.