Pressure Shut-Off Valve Geometry to Prevent Throttle Gap Clogging
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Solution Overview
Problem
Conventional pressure shut-off valves in high-pressure cleaners lack reliability due to clogging issues and have high manufacturing costs, primarily because of narrow throttle gaps that trap small particles, affecting switching properties and allowing for high manufacturing tolerances.
Innovation Solution
A pressure shut-off valve design featuring a long effective throttle gap with a gap height sufficient to prevent particle accumulation, allowing for increased flow resistance and robustness, using plastics for the valve body and housing to reduce costs, and incorporating a spring element to define limit pressures and manage overpressure positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a narrow throttle gap is used in conventional pressure shut-off valves, then the flow resistance is increased and switching precision is improved, but particles become trapped in the throttle gap causing clogging and reducing reliability
Solution Approach 1:
The invention changes the geometric parameters of the throttle gap, specifically increasing the gap length to at least 50% of the valve body's maximum diameter. This parameter change allows the gap to be long enough to flush out particles while maintaining sufficient flow resistance for reliable switching operation.
2Manufacturing precision
If a long effective throttle gap is used to prevent particle clogging, then the gap height can be increased to reduce manufacturing tolerances, but the flow resistance may be reduced
Solution Approach 1:
The invention optimizes multiple parameters of the throttle gap simultaneously: the gap length is increased to at least 50% of the maximum diameter, while the gap height is controlled to be at most 0.25 mm (preferably at most 0.2 mm). This combination of parameter changes achieves both relaxed manufacturing tolerances and sufficient flow resistance.
3Ease of manufacture
If plastics are used for the valve body and housing to reduce manufacturing costs, then manufacturing costs are reduced, but the structural strength may be compromised
Solution Approach 1:
The design parameters of the throttle gap (length ≥ 50% of maximum diameter, height ≤ 0.25 mm) are specifically optimized to work with plastic materials. The long gap design prevents particle accumulation that could compromise structural integrity, while the controlled gap height maintains sufficient flow resistance without requiring high-strength materials.
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 design enhances the reliability and robustness of the pressure shut-off valve by preventing particle clogging and reducing manufacturing costs through the use of plastics, while effectively managing pressure and mechanical loads within the high-pressure cleaner system.
Implementation Method 1
incorporating a spring element to define limit pressures and manage overpressure positions
Data Source
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AI summary
The invention relates to a pressure relief valve for a high-pressure cleaner. The pressure relief valve (10) has an effective throttling gap (30) between the valve housing (11) and the valve body (16), the effective throttling gap having a total length (a) measured in the direction of the longitudinal axis (17) of the valve body (16), wherein the effective throttling gap (30) is part of the flow connection (12) between the inlet (13) and the outlet (14). The valve body (16) has a maximum diameter (d) extending radially to the longitudinal axis (17). The total length (a) of the effective throttling gap (30) is at least 50% of the maximum diameter (d) of the valve body (16) in the first closed position (40) of the pressure relief valve (10).