Monolithic Gate Valve Seat Sealing for Low-Leak Pressure Swings
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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 inefficient at both high and low pressures, leading to system failure and increased operational costs.
Innovation Solution
A gate valve assembly with a single seat configuration that uses monolithic seats and spring-energized annular seals to create a dynamic seal between the valve body and gate, reducing leak paths and eliminating the need for a seat retainer, allowing for effective sealing at both high and low pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gate valves use multiple seal rings and complex sealing mechanisms, then sealing coverage is improved, but device complexity increases and reliability decreases due to multiple leak paths
Solution Approach 1:
The single seat is divided into multiple sealing surfaces including a first sealing surface, second sealing surface, third sealing surface, and fourth sealing surface. Each surface provides sealing contact at different locations, effectively segmenting the sealing function across multiple contact points while maintaining a unified seat structure, thereby reducing leak paths without requiring multiple separate seal rings.
Solution Approach 2:
The invention merges multiple sealing functions into a single integrated seat structure. The single seat combines the functions of multiple seal rings by providing multiple sealing surfaces that contact the gate at different locations, eliminating the need for separate seal rings and reducing overall device complexity while maintaining comprehensive sealing coverage.
2Reliability
If conventional gate valves use multiple seal rings, then sealing coverage is improved, but maintenance effort and operational costs increase
Solution Approach 1:
The invention extracts and eliminates the seat retainer component from the valve assembly. By designing a single seat that directly contacts the valve body without requiring a retainers, the structure is simplified and fewer parts need to be handled during maintenance, reducing maintenance effort and operational costs while preserving sealing performance.
Solution Approach 2:
Instead of using multiple seal rings that require individual replacement and adjustment, the invention inverts the approach by using a single seat with multiple sealing surfaces. This reversal simplifies the maintenance process as the single seat can be serviced as one unit rather than managing multiple separate seal components.
3Reliability
If conventional gate valves use complex sealing mechanisms, then sealing coverage is improved, but effectiveness at high and low pressures deteriorates
Solution Approach 1:
Different sealing surfaces of the single seat are positioned to contact the gate at different locations, with each surface optimized for specific pressure conditions. The first and second sealing surfaces provide sealing at one pressure condition while the third and fourth sealing surfaces provide sealing at another pressure condition, enabling the valve to adapt to varying pressure ranges effectively.
Solution Approach 2:
The single seat is designed to dynamically adjust sealing contact based on pressure conditions. As pressure varies, different sealing surfaces engage with the gate, allowing the sealing mechanism to adapt automatically to high or low pressure environments without requiring manual adjustment or complex control systems.
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 and efficient sealing across a wide pressure range, reducing maintenance needs and operational costs by minimizing leak paths and ensuring continuous contact between the valve body and gate, even under varying pressure conditions.
Implementation Method 1
spring-energized annular seals
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.