Pressure Washer Shutoff Valve With Long Throttle Gap
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Solution Overview
Problem
Conventional pressure shutoff valves in pressure washers are unreliable due to clogging by small particles and have high production costs, primarily due to the need for tight manufacturing tolerances in metal materials.
Innovation Solution
A pressure shutoff valve design featuring a long effective throttle gap between the valve body and housing, with a gap length of at least 50% of the valve body's diameter, which reduces clogging by flushing out particles and allows for greater manufacturing tolerances, enabling the use of plastics and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure shutoff valve uses a short throttle gap to maintain low flow resistance, then liquid flows easily through the valve, but small particles accumulate at the throttle gap causing clogging and reduced reliability
Solution Approach 1:
The patent changes the geometric parameters of the throttle gap, specifically increasing its length to at least 50% of the valve body's maximum diameter. This parameter change transforms the throttle gap from a short, wide opening prone to clogging into a long, narrow passage that prevents particle accumulation while maintaining acceptable flow characteristics through optimized dimensions
2Reliability
If a pressure shutoff valve uses tight manufacturing tolerances to ensure reliable switching, then the valve switches reliably, but production costs increase significantly
Solution Approach 1:
The patent changes the tolerance parameters from tight tolerances to enlarged tolerances of at least ±0.05 mm. This is made possible by the long throttle gap design, which is less sensitive to dimensional variations. The enlarged tolerances significantly reduce manufacturing complexity and cost while the inherent design robustness maintains switching reliability
Solution Approach 2:
The patent segments the valve body and housing into components that can be manufactured separately with standard tolerances and then assembled. The long throttle gap design allows each component to be produced independently using conventional manufacturing methods without requiring expensive precision machining or special processes
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 robustness of the pressure shutoff valve by reducing flow resistance and preventing particle accumulation, while lowering production costs through the use of plastics and simplified manufacturing processes.
Implementation Method 1
The pressure shutoff valve has an effective throttle gap between the valve housing and the valve body; the effective throttle gap having an overall length (a) as measured in a direction of the longitudinal axis of the valve body
Data Source
AI summary
The disclosure relates to a pressure shutoff valve for a pressure washer. The pressure shutoff valve has an effective throttle gap with an overall length (a), as measured in the direction of the longitudinal axis of the valve body, between the valve housing and the valve body, wherein the effective throttle gap is part of the flow connection between the inlet and the outlet. The valve body has a maximum diameter (d) extending radially with respect to the longitudinal axis. The overall length (a) of the effective throttle gap is at least 50% of the maximum diameter (d) of the valve body in the first closed position of the pressure shutoff valve.