Adjustable Orifice Valve Calibration Method
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Solution Overview
Problem
Current ammonia applicator systems require manual and time-consuming adjustments of orifices to achieve desired flow rates, with inconsistencies due to manufacturing inaccuracies, leading to unreliable and inaccurate calibration.
Innovation Solution
A method involving the use of fixed and variable flow restricting orifices with pressure sensors to calibrate exit lines by measuring and adjusting the variable orifice size until downstream pressure drops below upstream pressure, allowing for precise recording of maximum flow settings for each line, eliminating reliance on manufacturer tolerances and reducing calibration errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of orifices is used to change flow rate, then the ammonia applicator can adjust discharge line restriction, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent replaces static fixed orifices with dynamic adjustable orifices that can change their opening size. Each orifice assembly includes a movable member (such as a needle or plug) that can be positioned at different locations within the orifice body to create variable flow restrictions. This dynamic adjustment capability allows the system to adapt flow rates without manual intervention, resolving the contradiction between adaptability and time consumption.
2Manufacturing precision
If fixed orifices are substituted to change flow rate while maintaining line pressure, then the desired flow rate can be achieved, but the process is inconvenient and time-consuming
Solution Approach 1:
The patent creates a universal orifice assembly that combines multiple functions: it serves as both a flow restricting element and an adjustable valve mechanism. The single orifice body with its movable member can provide a range of flow rates without requiring substitution with different fixed orifices. This multi-functional design eliminates the need for manual orifice replacement while maintaining precise flow control, resolving the contradiction between manufacturing precision and ease of operation.
3Ease of operation
If adjustable orifices with knobs and screws are used, then remote adjustment is possible, but manufacturing inaccuracies cause inconsistent performance for the same knob location
Solution Approach 1:
The patent incorporates feedback mechanisms in the form of indicators that provide visual or digital information about the actual orifice opening size. The indicator system monitors the position of the movable member and communicates this information to the operator, allowing for precise verification of the set flow rate. This feedback loop compensates for manufacturing tolerances and ensures consistent, reliable calibration across all orifices, resolving the contradiction between ease of operation and reliability.
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 method ensures accurate and reliable calibration of adjustable orifices, reducing the chance of errors and streamlining the process, making the ammonia applicator system more efficient and ready for agricultural fertilization.
Implementation Method 1
The fluid pressures upstream of the fixed flow restricting orifice and downstream of the variable flow restricting orifice are measured
Implementation Method 2
the size of the variable flow restricting orifice is decreased until the downstream measured pressure drops below the upstream measure pressure
Data Source
AI summary
A method of calibrating individual exit lines of an agricultural ammonia applicator having a delivery path that extends through a manifold and multiple exit lines includes installing a fixed flow restricting orifice upstream of a variable flow restricting orifice and measuring the pressure upstream of the fixed flow restricting orifice. Beginning with the variable flow restricting orifice in an unrestricting flow condition, the pressure downstream of the variable flow restricting orifice is repeatedly measured and compared with the measured upstream pressure. The variable flow restricting orifice is incrementally closed after each comparison so long as the measured pressure downstream of the variable flow restricting orifice and the pressure upstream of the fixed flow restricting orifice remain substantially the same. The variable orifice maximum flow setting is recorded when the measured pressure downstream of the variable flow restricting orifice drops below the pressure upstream of the fixed flow restricting orifice.