Three-Way Valve Nozzle Segmentation for Fluid Pressure Stability
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Solution Overview
Problem
Fluid application systems in agriculture face challenges in precisely controlling fluid application rates due to pressure fluctuations, leading to inaccurate readings and unstable valve conditions, which affect the consistency of fluid delivery through nozzle assemblies.
Innovation Solution
The implementation of an electrically actuated three-way valve system within nozzle assemblies that alternately directs fluid between a spray outlet and a return line, connected to a fluid supply line, ensuring continuous fluid flow and reducing pressure fluctuations by allowing fluid to return to the supply line when not being sprayed, thereby stabilizing the fluid application process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pulsing or PWM valves are used to control fluid delivery at a desired rate, then fluid application rate control is achieved, but pressure fluctuations occur within the fluid application system
Solution Approach 1:
The system segments the fluid flow path into multiple independent channels, each with its own valve assembly. This allows individual control of fluid delivery to each nozzle while maintaining stable pressure in the main supply line, as not all valves open simultaneously, distributing the pressure demand over time.
Solution Approach 2:
The system pre-positiones multiple valves in a staged configuration upstream of the nozzles. By controlling the sequential opening of these pre-positioned valves, the system prepares fluid delivery in advance while maintaining pressure stability in the main line, preventing sudden pressure drops that would occur with single-valve pulsing.
2Productivity
If continuous pulsing of valves is used to control fluid flow rate, then desired fluid delivery timing is achieved, but dynamic flow or pressure fluctuations occur upstream from the nozzles
Solution Approach 1:
The continuous pulsing action is segmented into multiple discrete valve operations. Instead of one valve pulsing continuously causing upstream fluctuations, multiple valves operate in sequence, with each handling a portion of the total flow demand. This segmentation distributes the hydraulic shock and maintains more stable upstream conditions.
Solution Approach 2:
The system uses periodic, sequential actuation of multiple valves rather than continuous pulsing of a single valve. Each valve opens and closes in a periodic cycle, but their cycles are offset in time. This creates a smoother overall flow pattern upstream compared to single-valve continuous pulsing, reducing pressure fluctuations while maintaining productivity.
3Ease of operation
If pressure fluctuations occur within the fluid application system, then valve actuation is affected, but accurate fluid application rate control becomes difficult
Solution Approach 1:
By segmenting the fluid control into multiple independent valve-nozzle pairs, the system isolates pressure fluctuations to local zones rather than propagating them system-wide. Each valve assembly experiences smaller pressure variations, maintaining consistent actuation response and precise fluid application rates.
Solution Approach 2:
The manifold structure acts as an intermediary between the main supply line and individual nozzle assemblies. It buffers and distributes pressure fluctuations locally, preventing them from affecting upstream flow meters and control systems, thereby maintaining both valve actuation reliability and application precision.
4Measurement precision
If turbine flow meters are positioned upstream of the nozzles in a system with pressure fluctuations, then flow measurement is provided, but inaccurate readings occur due to pressure instability
Solution Approach 1:
The flow measurement function is segmented from the high-fluctuation nozzle control zones. Flow meters are positioned in the stable main supply line before the manifold branches, where pressure remains constant. This segmentation allows accurate flow measurement without being affected by the pressure fluctuations occurring downstream at the nozzle assemblies.
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
This solution enhances the precision of fluid application by minimizing pressure fluctuations, improving the accuracy of flow rates and application rates, and reducing errors in flow meter readings and valve stability issues, resulting in a more consistent and controlled delivery of agricultural fluids.
Implementation Method 1
an electrically actuated three-way valve fluidly connected between the inlet and each of the spray outlet and the return line outlet. The three-way valve is configured to alternately direct fluid from the inlet to the return line outlet and the spray outlet.
Implementation Method 2
The return line is connected in fluid communication with the return line outlet of each nozzle assembly, and is configured to direct fluid from the return line outlet to the fluid supply line.
Data Source
AI summary
A fluid application system includes a fluid supply line connected to a fluid supply, a plurality of nozzle assemblies connected in fluid communication with the fluid supply line, and a return line. Each nozzle assembly includes an inlet connected to the fluid supply line, a nozzle defining a spray outlet, a return line outlet, and an electrically actuated three-way valve fluidly connected between the inlet and each of the spray outlet and the return line outlet. The three-way valve is configured to alternately direct fluid from the inlet to the return line outlet and the spray outlet. The return line is connected in fluid communication with the return line outlet of each nozzle assembly, and is configured to direct fluid from the return line outlet to the fluid supply line.