Recessed Cutting Edge Wireline Shearing Gate Valve
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Solution Overview
Problem
Gate valves used in the oil and gas industry often face challenges in shearing wirelines during closure while maintaining a seal, as existing solutions require hard brittle inlays that are not durable enough to withstand repeated cycling and can be easily damaged.
Innovation Solution
A gate valve assembly with a recessed cutting edge and optional cutting member that can sever wirelines, featuring a 90° or 45° angle cutting edge and a recess to collect debris, ensuring the valve can close on a wireline and maintain a seal without damaging the valve material coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard brittle inlay is used on the valve seating surface to provide a high strength cutting edge for wireline shearing, then the cutting capability is improved, but the inlay is easily scratched or damaged, reducing sealing capacity and durability
Solution Approach 1:
The patent removes the hard brittle inlay from the valve seating surface, extracting the problematic component that caused damage to the coating. Instead, it uses the gate body material itself to form the cutting edge, eliminating the source of damage while maintaining cutting capability through proper geometric design of the cutting edge angle and configuration.
Solution Approach 2:
The patent applies local quality by creating a specific cutting edge geometry with a defined angle (e.g., 45 degrees) at the precise location where wireline contact occurs. This localized geometric feature provides the necessary cutting function without requiring a hard inlay, while the rest of the seating surface maintains its coating integrity for sealing.
2Productivity
If the gate valve is closed on the wireline to shear it, then the wireline is severed, but the sealing surfaces may be damaged, requiring frequent maintenance
Solution Approach 1:
The patent incorporates a recess in the gate body that receives wireline cuttings before they can contaminate the sealing surfaces. This preliminary action of capturing debris prevents subsequent damage to the seal, reducing maintenance frequency while enabling wireline shearing capability.
Solution Approach 2:
The recess acts as an intermediary structure between the cutting edge and the sealing surfaces. It captures and contains wireline cuttings, preventing them from acting as abrasives between the gate and seat, thereby protecting the sealing surfaces during the wireline shearing operation.
3Reliability
If a recess is formed in the gate to collect wireline cuttings, then debris is contained and sealing is protected, but the gate structure becomes more complex
Solution Approach 1:
The patent merges the recess feature directly into the gate body casting or machining process, combining the sealing protection function with the existing gate structure. This integration approach adds minimal complexity while providing effective debris collection and seal protection.
Data Source
AI summary
A gate valve having a body, a chamber housed in the body, a passage through the body that intersects the chamber, a gate for selectively opening and closing the valve, and a cutting edge on the gate. The cutting edge can sever any lines that may be in the valve and still seal after closing. The gate includes a recess formed to collect cuttings formed while severing the line.