Pilot-Operated Relief Valve Pressure Sensing for Flow Capacity
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Solution Overview
Problem
Conventional methods for measuring the flow capacity of pilot-operated relief valves are often inaccurate and require intrusive or costly retrofitting, as they assume the valve is fully open during pressure relief, leading to overestimation of fluid relief and increased regulatory compliance costs.
Innovation Solution
A pilot-operated relief valve assembly with a pressure detection system that determines run-time pressure factors and valve lift factors without directly measuring piston displacement, using pre-calibrated correlations to estimate valve flow capacity based on pressure measurements, eliminating the need for linear position transducers and reducing maintenance and certification requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods assume the valve is fully open during pressure relief, then the measurement process is simple, but the measurement precision deteriorates leading to overestimation of fluid relief
Solution Approach 1:
The patent replaces direct mechanical measurement of valve lift (using linear position transducers) with a mathematical model that calculates valve lift from pressure differential measurements. The control system uses the relationship between dome pressure, inlet pressure, and valve characteristics to determine actual valve lift and flow capacity, eliminating the need for intrusive mechanical position sensors.
Solution Approach 2:
The patent introduces pressure differential measurements as an intermediary parameter to indirectly determine valve lift and flow capacity. Instead of directly measuring valve position or flow, the system measures pressure at the dome and inlet, then uses these intermediate measurements with a mathematical model to calculate the actual fluid relief, providing accurate results without direct measurement of the target parameters.
2Measurement precision
If linear position transducers are installed to measure valve lift, then the measurement precision improves, but the device complexity and maintenance requirements increase
Solution Approach 1:
The patent eliminates mechanical position transducers by substituting them with a mathematical model that computes valve lift from pressure measurements. The control system processes dome pressure and inlet pressure readings through calibration data and valve characteristics to determine valve lift, avoiding all mechanical measurement components that require maintenance and certification.
Solution Approach 2:
The mathematical model uses the valve's own operating parameters (pressure differentials across the valve) to determine its state. The system leverages the inherent relationship between pressure and valve position in the relief valve's operation, requiring no external measurement devices and making the system self-diagnosing through its normal operational data.
3Measurement precision
If intrusive instrumentation is used to measure flow capacity, then the measurement precision improves, but the ease of operation deteriorates due to disturbance to existing systems
Solution Approach 1:
The patent uses pressure differential measurements as non-intrusive intermediaries to determine flow capacity. By measuring pressure at the dome and inlet through existing or minimally installed pressure taps, the system calculates actual valve lift and flow capacity without physically interfering with the valve operation or fluid flow, maintaining system integrity while achieving accurate measurements.
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 approach provides a more accurate estimation of fluid relief without intrusive instrumentation, allowing for real-time monitoring with minimal disturbance to existing systems and reducing compliance costs by accurately determining valve flow capacity based on pressure measurements alone.
Implementation Method 1
The pressure detection assembly can be configured to determine at least one of: a run-time dome pressure within the dome, a run-time inlet pressure at the valve inlet, or a run-time pressure differential between the valve inlet and the dome
Implementation Method 2
The main valve can be configured to permit or prevent flow from the valve inlet to the valve outlet based on a pressure differential between an inlet pressure at the valve inlet and a dome pressure within the dome
Data Source
AI summary
A pilot-operated relief valve assembly can include a relief valve, and a pressure detection assembly. A valve lift factor or indicator of relief flow can be determined based on pressure measurements gathered by the pressure detection assembly.