Self-Cleaning Flow Control Valve for Irrigation Clog Prevention
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Solution Overview
Problem
Conventional flow control valves in irrigation systems are prone to clogging due to debris entering the metering passage, leading to improper operation and the valve getting stuck in the open position.
Innovation Solution
Incorporation of a planar filter screen to prevent debris from entering the valve and a rotating scraper to remove debris from the screen, ensuring continuous operation by maintaining a debris-free flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a narrow metering passage is provided to control water flow, then water pressure control is improved, but debris clogging occurs
Solution Approach 1:
The passage is segmented into two parts: a wide first passage for debris-free water flow and a narrow second passage (metering orifice) for pressure control. This segmentation allows the narrow passage to function without clogging since debris is blocked by the filter screen upstream.
Solution Approach 2:
A filter screen is introduced as an intermediary element between the water supply and the metering passage. The filter screen removes debris from the water flow, protecting the narrow metering passage from clogging while allowing precise pressure control to be maintained.
2Reliability
If a filter screen is added to prevent debris, then reliability is improved, but device complexity increases
Solution Approach 1:
The filter screen is merged with the valve body structure, and the scraper mechanism is integrated into the existing flow path. This combining approach adds debris removal functionality without requiring separate independent systems, thus limiting the increase in complexity.
Solution Approach 2:
The scraper is designed to be automatically actuated by water pressure, eliminating the need for external motors or complex control mechanisms. The water flow itself drives the scraper to remove debris from the filter screen, making the system self-service and reducing overall complexity.
3Object-affected harmful factors
If the metering passage is clogged, then debris removal is improved (by blocking it), but valve operation reliability deteriorates
Solution Approach 1:
The filter screen performs preliminary debris removal before water enters the metering passage. By blocking debris upstream in the first passage, the metering passage remains clear and functional, preventing the harmful effect of clogging while maintaining reliable valve operation.
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
Prevents clogging of the metering passage and ensures reliable operation by automatically cleaning the debris from the filter screen during water flow, maintaining consistent water pressure and valve functionality.
Implementation Method 1
a flexible diaphragm portion connected to the base, wherein the base is provided at a center of the flexible diaphragm and the diaphragm is configured to flex to move the base into contact with the valve seat
Implementation Method 2
water pressure above the diaphragm portion holds the base on the valve seat
Implementation Method 3
a planar scraper positioned upstream parallel to the planar filter and rotatably mounted on the planar filter such that the planar scraper rotates as water flows through it and into the planar filter, wherein the planar scraper removes debris from the planar filter as it rotates
Data Source
AI summary
A flow control valve for an irrigation system includes a planar filter screen upstream of an inlet to a metering passage and a scraper device mounted to automatically clean the screen when water is flowing into the metering passage.