Pressure-Limiting Valve With Graduated Aerosol Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pressure-limiting valves do not provide a sensitive response to varying flow conditions, leading to inadequate separation of aerosols at different flow rates.
Innovation Solution
A pressure-limiting valve with a coalescing medium between the valve seat and body, featuring non-mating surfaces that allow for intermediate functional stages, enabling a graduated response to varying flow rates by transitioning between separator and impactor modes, with the coalescing medium decompressing in areas to create gaps for gas flow redirection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve body moves to an intermediate position between closed and fully open, then a gap is created for impactor action, but the separation effect deteriorates because aerosol particles cannot make the directional change
Solution Approach 1:
The valve seat surface is divided into multiple regions with different gap heights. The first region has a first gap height that maintains separator action, while the second region has a second gap height that provides impactor action. This segmentation allows both separation modes to coexist simultaneously, resolving the contradiction between handling higher flow rates and maintaining separation effectiveness.
Solution Approach 2:
Different regions of the valve seat are assigned different functional qualities - some areas have smaller gaps optimized for separator mode while other areas have larger gaps optimized for impactor mode. This local differentiation enables the valve to provide both separation mechanisms in appropriate locations, allowing intermediate positions to maintain both separation effect and flow handling capability.
2Adaptability or versatility
If the valve provides a graduated response to varying flow conditions, then adaptability improves, but the device complexity increases due to non-mating surfaces
Solution Approach 1:
The valve seat and coalescing medium are designed with asymmetric, non-mating surfaces where the valve seat has a complex multi-region geometry while the coalescing medium maintains a simpler form. This asymmetric design enables the graduated response to flow conditions through the varying gap heights, while concentrating the complexity primarily in the stationary valve seat rather than the moving coalescing medium.
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
This design allows for optimal separation of aerosols across a range of flow conditions, maintaining effective separation at low and high flow rates by adjusting the gap length and width between the coalescing medium and valve seat, ensuring reliable operation and extended service life of the coalescing medium.
Implementation Method 1
Aerosols that are contained in the gas stream are collected in the coalescing medium, where they coagulate into larger droplets, and can then be separated out from the gas stream as relatively large drops
Implementation Method 2
the gas changes direction as it flows out of the nozzle openings and flows through the gap that is created between the coalescing medium and the valve seat when the valve body is in its open position, i.e., along or above the surface of the coalescing medium, rather than through the coalescing medium. As a result of this directional deflection, comparatively heavier aerosol particles are unable to make the change in direction and precipitate out of the gas onto the coalescing medium
Data Source
AI summary
A pressure-limiting valve for use in a gas line conveying a gas that includes aerosols. The pressure-limiting valve has a movable valve body, a valve seat, and a compressible coalescing medium placed therebetween. The valve body has passages and nozzle openings and the valve seat has through-holes. In the closed position, the valve functions in separator mode and in the fully open position, in impactor mode. The pressure-limiting valve according to the invention provides a more sensitive response to varying flow conditions, due to deviating surface profiles of the valve seat and coalescing medium, which provide intermediate stages of separator and impactor modes as a function of the volume of flow.