Gate Valve Seat Insert Assembly for Debris-Free Static Sealing
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Solution Overview
Problem
Gate valves in the oil and gas industry face challenges in preventing leaks due to gaps between the valve body and the gate, leading to fluid leakage when the gate blocks the flow passage.
Innovation Solution
A gate valve assembly with a seat insert threaded into the valve body, featuring annular seals and springs to create a static seal, ensuring continuous contact with the gate and preventing debris entry, while using high-pressure and high-temperature seals for enhanced sealing capabilities on both upstream and downstream sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seal rings are used to bridge the gap between valve body and gate, then fluid leakage is prevented, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The seat assembly is divided into separate components: a seat insert that threads into the valve body and a separate seat that positions within the insert. This segmentation allows each component to be manufactured and assembled independently, simplifying the overall assembly process while maintaining effective sealing through the coordinated interaction of these modular parts.
Solution Approach 2:
The seat insert acts as an intermediary component between the valve body and the seat. It provides a threaded interface for easy installation and a structured housing for the seat, thereby simplifying the connection between the valve body and gate while ensuring proper seal ring positioning and effective leak prevention.
2Adaptability or versatility
If dynamic sealing is used between seat and gate, then sealing adaptability is improved, but wear from dynamic action reduces valve lifespan
Solution Approach 1:
The seat is designed with dynamic capability to move within the seat insert, allowing the seal ring to adapt to variations in gate surface geometry and wear patterns. This dynamic adjustment maintains effective sealing contact while distributing wear more evenly, thereby extending valve lifespan despite the dynamic action.
Solution Approach 2:
The seal ring material and geometric parameters are optimized to balance adaptability and wear resistance. The seal ring can deform elastically to conform to the gate surface for adaptability, while the material properties are selected to minimize wear during this conforming action, thus extending the valve's operational life.
3Reliability
If high-pressure seals are implemented, then sealing effectiveness at maximum working pressure is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sealing system is segmented into the seat insert (with threaded interface) and the seat (containing the seal ring). This segmentation allows the threading to be manufactured as a standard mechanical feature with conventional tolerances, while the sealing function is achieved through the separate seat and seal ring components, reducing the overall manufacturing precision requirements while maintaining high-pressure sealing effectiveness.
Solution Approach 2:
The seat insert serves as an intermediary that decouples the threading precision requirements from the sealing precision requirements. The threaded interface can be manufactured with standard tolerances, and the sealing performance is achieved through the separate seat and seal ring assembly, thereby reducing manufacturing precision requirements while maintaining effective high-pressure sealing.
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 effectively prevents fluid leaks at maximum working pressures and protects against erosion and corrosion, extending the valve's lifespan by maintaining a static seal and reducing dynamic action, thus ensuring reliable operation.
Implementation Method 1
springs to create a static seal, ensuring continuous contact with the gate
Implementation Method 2
a seat insert configured to be threaded it to the opening of the valve body
Data Source
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AI summary
The present invention provides a gate valve assembly having a valve body (201) with a channel extending from a distal end to a proximal end, a gate configured to be moved from a first position to a second position, the second position being when the gate is positioned in the channel of the valve body between the distal end and the proximal end of the valve body. A seat insert (202) is also provided to be threaded into a pocked of the valve body and a seat (208) is configured to be positioned within the seat insert. A seal (210) is adapted within a groove of the seat insert positioned between the valve body and the seat insert, wherein the seal is a fixed static seal providing no gaps and/or spaces between the seal insert and the valve body allowing no debris to corrupt the seals.