Multi-Passage Ball Valve Control for Precision Row Liquid Application
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Solution Overview
Problem
Existing agricultural planter systems face challenges in controlling and monitoring liquid applications across different row units, leading to inefficiencies in fertilizer and chemical distribution, with conventional valves having limited flow ranges and control issues.
Innovation Solution
The implementation of a control and monitoring unit (CMU) with dual passages and a ball valve that allows for a wide operating range of flow rates, including up to 60x, providing linear response across the entire operating range, and includes flow meters for precise monitoring and control of liquid applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional valves are used for controlling liquid flow in agricultural planter systems, then the device complexity is reduced, but the flow control precision and operating range are limited
Solution Approach 1:
The flow control system is segmented into multiple independent passageways (first passage, second passage, third passage) each with its own flow meter and control mechanism. This segmentation allows precise measurement and control of liquid flow across different rate ranges while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The system dynamically switches between different passageways based on the desired flow rate. The controller selectively opens or closes specific passages (e.g., using ball valves or gate valves) to match the required application rate, enabling the system to adapt its configuration to different operating conditions and achieve precise flow control across a wide range
2Adaptability or versatility
If a single passage flow control system is used, then the device complexity is low, but the operating range of flow rates is limited
Solution Approach 1:
The liquid flow path is divided into multiple segmented passages (first, second, and third passages) with different flow capacities. Each passage can be independently controlled, allowing the system to handle a wide spectrum of flow rates by activating only the necessary passages, thus expanding operational versatility without proportionally increasing complexity
Solution Approach 2:
The flow control device serves multiple functions through its multi-passage design: it can operate in low-flow mode (first passage only), medium-flow mode (first and second passages), and high-flow mode (all three passages). This multi-functionality allows a single device to replace what would traditionally require multiple different valve configurations
3Measurement precision
If flow meters are added to each passage for monitoring, then the measurement precision of liquid application is improved, but the device complexity increases
Solution Approach 1:
Flow meters are installed in each passage to provide real-time feedback on liquid flow rates. The controller receives this feedback information and automatically adjusts valve positions or passage configurations to maintain the desired application rate, ensuring precise liquid application monitoring and control
Solution Approach 2:
The system uses automated electronic control to manage the complexity introduced by multiple flow meters and passages. The controller automatically determines which passages to activate based on the required flow rate and monitors flow meter readings, reducing the need for manual intervention and making the complex system easier to operate
4Adaptability or versatility
If multiple row units with independent flow control are implemented, then the adaptability to different field conditions is improved, but the overall system complexity increases
Solution Approach 1:
The planter system is segmented into multiple independent row units, each equipped with its own flow control device featuring multiple passages and flow meters. This segmentation allows each row to be independently controlled and monitored, enabling adaptation to different field conditions across different rows while maintaining a consistent modular design that manages overall system complexity
Data Source
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AI summary
Described herein are systems and devices for controlling and monitoring liquid applications of agricultural fields. In one embodiment, a flow device for controlling flow during an agricultural operation includes an offset ball valve having multiple openings that rotate in position to control flow of a liquid through the offset ball valve to an outlet passage. The flow device also includes a first passage that provides a first flow path from an inlet to at least one opening of the offset ball valve and second passage that provides a second flow path from the inlet to at least one opening of the offset ball valve.