Gate Valve Cutting Edge and Recessed Seal Design
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Solution Overview
Problem
Gate valves in the oil and gas industry face challenges in cutting objects within a flow path while maintaining a robust seal, as existing solutions often compromise the seal integrity due to mechanical damage from cutting operations.
Innovation Solution
A gate valve apparatus with a housing, a first valve seat, and a gate valve member featuring a cutting edge and a seal pocket design that allows axial movement for sealing engagement, protecting the seal surfaces from mechanical damage by positioning them recessed relative to the cutting edges, enabling effective cutting and sealing in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gate valve member includes cutting edges for cutting objects within the flow path, then the valve can perform emergency closure and cut objects, but the seal surfaces may become compromised due to mechanical damage from cutting operations
Solution Approach 1:
The gate valve member is segmented into distinct functional zones: cutting edges positioned at the leading edge for object cutting, and seal surfaces recessed within seal pockets separated from the cutting plane. This spatial segmentation allows the cutting function and sealing function to operate independently without interfering with each other, resolving the contradiction between cutting capability and seal integrity
Solution Approach 2:
The seal surfaces are positioned in a different spatial dimension (recessed depth) relative to the cutting edges. By moving the seal surfaces into recesses that extend backward from the cutting plane, the patent creates dimensional separation between the cutting action zone and the sealing contact zone, preventing mechanical damage to seals during cutting operations
2Device complexity
If the seal surfaces are positioned close to the cutting edges for compact design, then the device complexity is reduced, but the seal surfaces are exposed to mechanical damage from deformed elements during cutting
Solution Approach 1:
The seal surfaces are nested within recesses or pockets in the gate valve member, creating a protective cavity that shields the seal surfaces from external mechanical damage. This nesting approach allows the seals to be protected without significantly increasing the overall valve dimensions, balancing compactness with protection
Solution Approach 2:
The recessed seal surfaces are positioned ahead of potential deformed elements before they can cause damage. By anticipating the deformation of cutting edge elements during operation and positioning seals in recesses that extend backward from the cutting plane, the design preemptively prevents mechanical damage to the seal surfaces
Data Source
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Figure 4A~4C
Figure 5A~5C
AI summary
A gate valve apparatus comprises a housing defining a flow path, a first valve seat located within the housing around a periphery of the flow path and comprising a first peripheral seal surface, and a gate valve member which is moveable laterally across the flow path between a first position in which the flow path is open and a second position in which the flow path is closed. A first cutter is provided on an edge region of a first surface of the gate valve member to be moveable across the flow path with the gate valve member along a first cutting plane. A first seal pocket is defined by a depression in the first surface of the gate valve, wherein a second peripheral seal surface is provided within the first seal pocket. The first valve seat and the gate valve member are axially moveable relative to each other to permit a portion of the first valve seat to become received into the first seal pocket of the gate valve member when said gate valve member is located within its second position to provide sealing engagement between the first and second peripheral seal surfaces.