Threaded Gate Valve Seat Insert for Debris-Resistant 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, which can lead to fluid leakage when the gate is closed.
Innovation Solution
A gate valve assembly with a seat insert and seat configuration that uses threaded mechanical means to secure the seat inserts into the valve body, combined with annular seals and springs to create a static seal, preventing debris entry and ensuring continuous contact with the gate for effective sealing at various pressures.
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 increases due to additional components and assembly steps
Solution Approach 1:
The seat assembly is divided into separate components: a seat insert that threads into the valve body and a separate seat ring that bridges the gap between the valve body and gate. This segmentation allows each component to be optimized independently while working together to prevent leakage.
Solution Approach 2:
The seat insert acts as an intermediary component between the valve body and the seat ring. It provides a threaded interface that secures the seat ring in position, enabling the seat ring to effectively bridge the gap and prevent fluid leakage without requiring direct integration with the valve body.
2Reliability
If traditional seat assemblies are used, then basic sealing is achieved, but sealing performance degrades under high pressure and temperature conditions
Solution Approach 1:
The seat ring is designed with specific local properties including a bridging gap configuration and engagement features that provide enhanced sealing contact. The seat insert provides localized threading and positioning that ensures the seat ring maintains optimal sealing pressure under varying conditions.
Solution Approach 2:
The seat assembly allows for dynamic adjustment of sealing contact through the interaction between the seat ring's engagement features and the gate surface. This dynamic contact ensures consistent sealing performance across a wide range of pressures and temperatures by adapting to thermal expansion and pressure-induced deformation.
3Ease of manufacture
If simple threaded insertion is used for seat inserts, then ease of installation is improved, but sealing reliability may be compromised under high stress conditions
Solution Approach 1:
The seat insert is designed with pre-formed threading that is precisely engineered to match the valve body's threaded opening. This preliminary preparation of the threading geometry ensures that the simple insertion process results in a secure, reliable connection that can withstand high stress conditions without compromising sealing integrity.
Data Source
AI summary
The present invention provides a gate valve assembly having a valve body 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 is also provided to be threaded into a pocked of the valve body and a seat is configured to be positioned within the seat insert. A seal 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.