Electropneumatic Flow Valve Sequential Proportional Control
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Solution Overview
Problem
Existing proportional pneumatic flow control valves lack precision at lower flow rates, resulting in significant errors that are problematic for various applications, as they are typically calibrated for a specific range and fail to provide accurate control over a wide range of flow rates.
Innovation Solution
A unique electro pneumatic proportional flow control device utilizing a plurality of proportional valves that activate sequentially and operate in parallel, with individual valves calibrated to open at different voltages based on mechanical or electromagnetic modifications, allowing for high-speed and high-precision flow output at both low and high flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single proportional valve is calibrated to a specific range of flow rates, then the valve can provide accurate control within that range, but the valve percentage of error increases for the full scale, resulting in poor precision at lower flow rates
Solution Approach 1:
The flow control system is segmented into multiple proportional valves, each calibrated for a specific flow range segment. The valves are activated sequentially based on the required flow rate, with each valve handling a portion of the overall flow range. This segmentation allows each valve to operate within its optimal precision range while collectively covering a broad flow spectrum.
Solution Approach 2:
The system changes the operational parameters (which valve is active) based on the required flow rate. By switching between different valves calibrated for different ranges, the system adapts its parameters to match the desired flow level, ensuring high precision across the entire flow spectrum rather than compromising for a single range.
2Adaptability or versatility
If multiple valves are used to cover a broad flow range, then flow precision across the full range improves, but the valve actuation response time and system complexity increase
Solution Approach 1:
The system dynamically selects which valve to activate based on the required flow rate. This dynamic switching strategy allows the system to use only one valve at a time, maintaining simplicity in operation while achieving broad flow range coverage. The sequential activation based on flow requirements optimizes the balance between range coverage and system simplicity.
3Measurement precision
If multiple valves are used to improve low flow precision, then flow control accuracy at lower rates improves, but the turn down ratio and actuation response time characteristics worsen
Solution Approach 1:
The valves are pre-calibrated for specific flow ranges before operation. This preliminary calibration ensures that when a valve is selected, it is already optimized for the required flow range, eliminating the need for complex real-time adjustments. This pre-prepared state allows for both high precision and fast response, as the selected valve is immediately ready to operate at optimal performance.
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 sequential activation of proportional valves enhances valve actuation response time and turn down ratio, achieving high-speed and high-precision flow characteristics across a broad range of flow rates, addressing the imprecision issues at lower flow rates.
Implementation Method 1
Each of the proportional valves includes a flexible armature manipulated by a magnetic core actuated by an electromagnetic coil
Implementation Method 2
a flexible armature manipulated by a magnetic core actuated by an electromagnetic coil
Data Source
AI summary
An electropneumatic proportional flow valve improves flow control because it incorporates a plurality of internal valves in parallel with each electronically controlled, miniature proportional valve manipulated sequentially to each other. Such parallel arranged valves operated sequentially allows for precision control of the low-end of the full scale output; the larger mechanical valve allows for the high-end of the full scale output.