Single-Seat Gate Valve Sealing for High-Pressure Leak Control
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Solution Overview
Problem
Conventional gate valves experience leaks and require frequent maintenance due to multiple leak paths and complex sealing mechanisms, which are costly and inefficient, especially under high pressure conditions.
Innovation Solution
A single seat configuration gate valve assembly with monolithic seat and spring-energized annular seal assemblies that reduce leak paths and eliminate the need for additional seat retainers, utilizing a dynamic seal interface to maintain sealing at both low and high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gate valves use multiple seal rings and complex sealing mechanisms to prevent leaks, then sealing reliability improves, but device complexity and maintenance costs increase
Solution Approach 1:
The patent combines multiple separate seal rings into a single integrated seat assembly that incorporates both upstream and downstream sealing surfaces. This unified structure eliminates the need for multiple discrete seal components while maintaining comprehensive sealing coverage, directly resolving the contradiction between sealing reliability and device complexity
Solution Approach 2:
The single seat assembly performs multiple sealing functions simultaneously - it provides both upstream and downstream sealing, acts as a structural support element, and serves as a flow guide. This multi-functional design achieves reliable sealing across multiple interfaces without proportionally increasing complexity, as the single component fulfills multiple roles that previously required separate parts
2Reliability
If conventional gate valves use multiple leak path sealings to prevent fluid leakage, then reliability improves, but manufacturing costs and machining complexity increase
Solution Approach 1:
The invention merges multiple sealing functions into a single monolithic seat assembly that can be machined as one integrated component. This eliminates the need for separate machining operations on multiple seal rings and their associated mounting structures, significantly reducing machining complexity and cost while maintaining comprehensive leak prevention capability
3Reliability
If conventional gate valves use complex seal assemblies with multiple components, then sealing performance improves, but maintenance frequency and costs increase
Solution Approach 1:
By combining multiple seal rings into a single integrated seat assembly, the invention reduces the number of potential failure points. Instead of multiple separate seals that could individually degrade or fail, the unified structure provides consistent sealing performance with fewer components that require inspection and replacement, directly reducing maintenance frequency
Solution Approach 2:
The seat assembly is designed to maintain its sealing performance through self-adjusting characteristics where the high-pressure fluid automatically enhances the sealing force against the gate. This self-reinforcing mechanism reduces the need for manual adjustment and intervention, allowing the valve to maintain reliable sealing with minimal maintenance
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 provides reliable sealing across a wide pressure range, reduces maintenance needs, and lowers machining costs by simplifying the design to two primary leak paths, ensuring efficient operation and increased reliability.
Implementation Method 1
spring-energized annular seal assemblies
Implementation Method 2
spring-energized annular seal assemblies
Implementation Method 3
dynamic seal interface to maintain sealing at both low and high pressures
Data Source
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AI summary
An embodiment includes a gate valve comprising: a valve body including a cavity coupled to a channel having proximal and distal portions; a gate to seal and unseal the channel; proximal and distal seats adjacent the gate; wherein (a) the proximal seat traverses towards the gate and stops at a first position when the gate is closing and the proximal channel portion is more highly pressurized than the cavity, and (b) the distal seat slides away from the gate and stops at a second position when the gate is closing and the cavity is more heavily pressurized than the distal channel portion. Other embodiments are described herein.