Injection Valve Seal Protection via Downstream Diffuser
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Solution Overview
Problem
Injection valves in the resource recovery and fluid sequestration industries face significant issues with flow cutting of seals due to pressure differentials, leading to reduced service life and increased maintenance and operational costs, particularly in the injection valve space where structural constraints hinder advancements.
Innovation Solution
An injection valve design featuring a movable insert with a seal and diffuser, where the seal is positioned downstream of the diffuser in the flow path, allowing fluid to exit under pressure differential without causing flow cutting, and a method involving pressurizing the insert's inside diameter, shifting the insert to a partially open position, and diffusing fluid past the seal to reduce flow cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a valve is designed to operate across a pressure differential sufficient to cause flow cutting, then the valve can achieve adequate flow control capability, but the seal experiences flow cutting that reduces service life and increases maintenance costs
Solution Approach 1:
A diffuser element is introduced as an intermediary component between the high-pressure fluid source and the seal. The diffuser dissipates the kinetic energy and redirects the fluid flow, preventing direct impingement on the seal while maintaining flow control capability across the pressure differential
Solution Approach 2:
The valve internal flow path is segmented into distinct zones: a high-pressure inlet zone, a diffuser-mediated transition zone, and a low-pressure outlet zone. This segmentation allows the seal to operate in a protected zone while the diffuser handles the high-energy fluid dynamics
2Reliability
If the seal is positioned to directly block the flow path for effective sealing, then sealing effectiveness is improved, but the seal becomes vulnerable to flow cutting under pressure differential
Solution Approach 1:
The diffuser serves as a mediator that intercepts and redirects the high-velocity fluid flow before it can contact the seal. The seal maintains its blocking position for effective sealing while the diffuser absorbs the harmful flow cutting effects
Solution Approach 2:
The diffuser converts the harmful high-velocity direct flow into a beneficial dispersed, lower-velocity flow pattern that exits downstream of the seal, transforming the flow cutting threat into a protected flow path
3Ease of manufacture
If the valve structure is simplified to ease manufacturing and installation, then ease of manufacture is improved, but structural constraints prevent effective protection of the seal from flow cutting
Solution Approach 1:
The diffuser and valve body are designed as integrated components in many embodiments, combining the sealing function and flow diffusion function into a unified structure that is manufactured as a single piece, maintaining manufacturing simplicity while providing seal protection
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 extends the service life and reduces maintenance costs of injection valves by protecting the seal from flow cutting, ensuring reliable fluid injection under pressure differentials, and maintaining the seal's position to prevent unintended shifting.
Implementation Method 1
diffusing fluid flowing from the inside diameter of the insert
Data Source
AI summary
An injection valve including a housing having a port, an insert movably disposed in the housing, a seal and a diffuser disposed on the insert, the seal and diffuser being movable with the insert. A method for injecting in a borehole including pumping fluid into the borehole, pressurizing an inside diameter of an insert of an injection valve, moving the insert of the injection valve to a position that is not fully closed, diffusing fluid flowing from the inside diameter of the insert; and then flowing the diffused fluid past a seal on the insert.