Valve Cage Flow Geometry for Noise and Cavitation Control
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Solution Overview
Problem
Traditional control valve cages face design restrictions that require large travel distances for the valve plug to ensure proper outlet spacing for high-performance designs, limiting their efficiency and cost-effectiveness, especially in applications requiring noise attenuation or energy dispersion.
Innovation Solution
A control valve cage design with a circumferential wall featuring non-co-planar flow passages, where the outer flow length is greater than the inner flow length, allowing for compact inlet spacing and longer outlet spacing, enabling the use of shorter travel actuators while maintaining performance through additive manufacturing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional co-planar flow passages are used in valve cage, then manufacturing is simpler, but outlet spacing is insufficient for high-performance noise attenuation designs
Solution Approach 1:
The patent transitions from co-planar flow passages to non-co-planar flow passages that utilize three-dimensional space within the valve cage. The flow passages are configured to extend in multiple dimensions rather than remaining in a single plane, allowing outlets to be spaced further apart while maintaining compact inlet spacing. This dimensional change enables high-performance noise attenuation designs without requiring excessive valve size.
2Object-affected harmful factors
If outlet spacing is increased for noise attenuation, then noise performance improves, but valve plug travel distance increases
Solution Approach 1:
By configuring flow passages in non-co-planar arrangements that utilize three-dimensional space, the patent achieves increased outlet spacing without proportionally increasing the linear travel distance of the valve plug. The flow passages are routed through the volume of the valve cage body, allowing outlets to be positioned further apart in three-dimensional space while the valve plug maintains a compact travel path along its axis.
Solution Approach 2:
The patent employs curved and angled flow passage geometries that efficiently navigate fluid flow from inlets to outlets in three-dimensional space. These curved pathways allow the fluid to traverse the required distance between spaced outlets without requiring the valve plug to travel the same extended distance, as the flow passages utilize spatial efficiency through curvature rather than straight-line extensions.
3Volume of moving object
If valve size is reduced for compactness, then space efficiency improves, but flow capacity decreases
Solution Approach 1:
The non-co-planar flow passages utilize three-dimensional space within the compact valve body, effectively increasing the available flow volume without increasing the external valve dimensions. By routing flow passages through the depth and volume of the valve cage rather than merely across its face, the patent achieves enhanced flow capacity within a reduced valve size.
Solution Approach 2:
The flow passages are nested within the valve cage body in a space-efficient arrangement, with multiple flow paths utilizing different regions of the available volume. This nesting approach allows the valve to maintain compact external dimensions while accommodating sufficient internal flow capacity through efficient spatial utilization of the cage volume.
Data Source
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AI summary
A control valve includes a body having an inlet and an outlet and a valve seat positioned in a passageway between the inlet and the outlet. A valve plug is positioned within the body and is movable between an opened position and a closed position to modulate a fluid flow at the outlet. A cage is disposed within the body adjacent the valve seat and proximate the valve plug and has a circumferential wall having an outer surface and an inner surface aligned along a longitudinal axis of the cage. The outer surface of the cage defines an outer flow length and the inner surface defines an inner flow length that is less than the outer flow length.