Pressure-Limiting Valve Calibration for Stable Opening Pressure
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Solution Overview
Problem
Current calibration methods for pressure-limiting valves lack reliability and precision, as they fail to account for boundary condition variables, leading to unstable opening pressures and potential damage from uncontrolled valve dynamics.
Innovation Solution
An iterative and adaptive calibration method using a servo-controlled calibration tool and pressure sensor to directly control the opening pressure, ensuring stable valve operation by adjusting the position of the abutment seat and measuring pressure in real-time, allowing for precise calibration and maintaining steady-state conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed orifice is used to generate flow rate for calibration, then the flow rate can be controlled, but the valve dynamics become uncontrolled causing instability and potential damage
Solution Approach 1:
The calibration tool is made movable along the axis of the valve, transitioning from a static fixed orifice system to a dynamic adjustable system. The calibration tool can be positioned at different locations within the central hole, allowing the flow rate to be dynamically adjusted during calibration to maintain stable valve operation while achieving precise opening pressure measurement
Solution Approach 2:
The system changes the parameter of flow rate control by moving the calibration tool to different positions rather than using a fixed orifice. By adjusting the position of the calibration tool along the axis, the flow rate can be optimized to prevent uncontrolled valve dynamics while ensuring accurate opening pressure measurement
2Ease of manufacture
If the abutment seat is implanted at preset height, then the spring compression is fixed, but the calibration force accuracy is reduced due to boundary condition uncertainties
Solution Approach 1:
The abutment seat transitions from a fixed preset height to a dynamically adjustable position. The calibration tool can move the abutment seat to different heights along the axis, allowing the spring compression to be adjusted during calibration to achieve accurate calibration force while maintaining ease of manufacture through the movable calibration tool
Solution Approach 2:
A pressure sensor provides real-time feedback on the opening pressure during calibration. This feedback allows the calibration tool to adjust the abutment seat position iteratively until the desired calibration force is achieved, compensating for boundary condition uncertainties and achieving precise calibration
3Measurement precision
If direct pressure measurement is used, then the opening pressure can be controlled, but the valve must operate in steady state to ensure precision
Solution Approach 1:
A pressure sensor is integrated into the calibration tool to provide real-time feedback on the opening pressure. This feedback enables direct control of the opening pressure during calibration, allowing the valve to be calibrated in steady state conditions for high precision while the automated feedback loop manages the complexity of maintaining stable 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
This method enables precise and replicable calibration of pressure-limiting valves, preventing ball instability and damage, by directly controlling the opening pressure and ensuring stable valve operation, thus improving accuracy and longevity.
Implementation Method 1
the spring 9 is compressed by effect of a thrust force F s , applied by the cylindrical abutment seat 10 until reaching a height such that the force F corresponds to the desired objective calibration force value F t
Implementation Method 2
supplying fluid under pressure to the valve
Data Source
Figure 1
Figure 2-I
Figure 2-II
AI summary
A calibration method of a valve (1), wherein a valve seat (6) houses a movable element (7), a spring (9) and a ball (8) carried by the movable element and configured to be arranged in abutment against an abutment seat (10) housed in the valve seat and provided with a channel (11) communicating with an inlet (22) of the valve. The method comprises a calibration cycle wherein the steps are carried out of: axially moving a pusher element (30) so as to displace the abutment seat (10) along the axis compressing the spring; supplying fluid under pressure to the inlet of the valve; creating a narrowing at an outlet (23) of the valve and maintaining the pressure inside a chamber (20) containing the ball so that said pressure is close to a set fixed value in order to obtain a controlled opening of the valve.