Choke Valve Flow-Impeding Recesses for Low Flow Control
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Solution Overview
Problem
Conventional choke valves face difficulties in controlling low flow rates due to rapid increases in fluid flow as the valve member opens, leading to reduced rangeability and increased sensitivity to position deviations, making precise control challenging.
Innovation Solution
Incorporation of flow-impeding recesses in the throttling member and valve member design, which slow fluid flow by creating annular or other shaped recesses that disrupt the flow path, reducing sudden rate changes and allowing for more controlled adjustments across the valve's stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional choke valves are used without flow-impeding recesses, then the valve structure is simple, but the rangeability is reduced due to rapid flow rate increase near closed position
Solution Approach 1:
The invention introduces flow-impeding recesses at specific locations (on the valve member or throttling member) to create localized flow resistance. These recesses are strategically positioned to impede flow when the valve is near closed position, while having minimal impact when the valve is fully open, thus improving rangeability without requiring complete redesign of the valve structure.
Solution Approach 2:
The flow path is segmented by introducing multiple flow-impeding recesses that create separate flow resistance zones. This segmentation allows different portions of the flow to be controlled at different stages of valve opening, enabling gradual flow rate increase and improving controllability across the full range of operation.
2Quantity of substance
If the valve member is positioned near closed position, then low flow rates are achieved, but control precision deteriorates due to rapid flow rate changes
Solution Approach 1:
The flow-impeding recesses create preliminary resistance to flow before the valve fully opens. This preliminary anti-action counteracts the natural tendency for rapid flow rate increase, allowing for more gradual and precise control of low flow rates. The recesses effectively pre-throttle the flow, reducing sensitivity to small position deviations.
3Adaptability or versatility
If flow-impeding recesses are added to the valve member or throttling member, then rangeability is improved, but device complexity increases
Solution Approach 1:
The flow-impeding recesses are introduced only at specific locations on the valve member or throttling member, rather than redesigning the entire valve structure. This localized modification approach improves rangeability while minimizing the increase in overall device complexity and manufacturing cost.
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 flow-impeding recesses enhance the rangeability of choke valves by gradually increasing flow rates, improving control over low flow rates and reducing the impact of position deviations, thereby increasing the controllable range of flow rates.
Implementation Method 1
flow-impeding recesses in the throttling member and valve member design, which slow fluid flow by creating annular or other shaped recesses that disrupt the flow path
Implementation Method 2
flow-impeding recesses in the throttling member and valve member design, which slow fluid flow by creating annular or other shaped recesses that disrupt the flow path
Data Source
AI summary
Disclosed is a device that includes a choke valve. The choke valve may include a generally tubular throttling member having a sealing shoulder disposed in an inner volume of the throttling member, a plurality of openings configured to flow a fluid between the inner volume of the throttling member and an outer volume of the throttling member, and a flow-impeding recess disposed between the sealing should and the plurality of openings in the inner volume of the throttling member. The choke valve may also include a valve member disposed at least partially in the inner volume of the throttling member.