Gate Valve Seat Assembly With Static Sealing Against Debris
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Solution Overview
Problem
Existing gate valves in the oil and gas industry suffer from leaks due to gaps between the valve body and the gate, necessitating an improved seat assembly to prevent fluid leakage.
Innovation Solution
A gate valve assembly with fixed seat inserts coupled to the valve body by press fitting, featuring annular seals and springs to ensure continuous contact and static sealing, preventing debris entry and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gate valve design is used with gaps between valve body and gate, then the structure is simple, but fluid leakage occurs
Solution Approach 1:
The valve body is divided into separate components: a body portion and a seat insert portion that can be assembled together. The seat insert is a separate component that can be press-fitted into the body portion, allowing for improved sealing without redesigning the entire valve structure.
Solution Approach 2:
A seat insert acts as an intermediary component between the valve body and the sealing surfaces. This insert provides a dedicated seating area for the gate while maintaining structural integrity, solving the leakage problem without requiring complete redesign of the valve body.
2Ease of manufacture
If seat inserts are threaded into valve body, then installation is easier, but debris can enter thread interfaces causing erosion
Solution Approach 1:
The threading function is extracted from the pressure-containing valve body and placed in a non-pressure seat insert. This allows the valve body to maintain its pressure integrity while the seat insert provides the necessary mechanical connection without exposing critical pressure boundaries to debris contamination.
Solution Approach 2:
The seat insert is designed as a replaceable component that can be easily installed and removed. If debris does enter the seat insert interface, the insert itself can be replaced without damaging the expensive valve body, effectively managing the erosion risk.
3Reliability
If fixed seat inserts with press fitting are used, then sealing is enhanced and erosion prevented, but manufacturing complexity increases
Solution Approach 1:
The seat insert is designed with a press-fit interface that requires preliminary preparation of the body portion cavity. The insert is manufactured with precise dimensions and fit tolerances to ensure proper press-fitting, which is performed as a preliminary assembly step before final valve assembly.
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 enhanced sealing, protecting against erosion and corrosion, ensuring reliable operation under varying pressures and temperatures, and extending the valve's lifespan.
Implementation Method 1
a seat insert coupled to the opening of the valve body by a press fitting
Implementation Method 2
featuring annular seals and springs to ensure continuous contact and static sealing
Implementation Method 3
featuring annular seals and springs to ensure continuous contact and static sealing
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, 222) 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 seat insert and the valve body allowing no debris to corrupt the seals.