Pilot-Operated Relief Valve Flow Estimation from Pressure Signals
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Solution Overview
Problem
Conventional methods for measuring the flow capacity of pilot-operated relief valves are inaccurate and often require intrusive or costly retrofitting of sensor equipment, particularly when dealing with modulating valves where pressure is relieved at less than maximum lift, leading to overestimation of fluid relief and increased regulatory compliance issues.
Innovation Solution
A pilot-operated relief valve assembly with a pressure detection system that calculates a valve lift factor based on pressure measurements without directly measuring piston displacement, using predetermined correlations to estimate flow capacity during runtime operations, 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 are used to measure flow capacity, then measurement can be performed, but measurement precision is poor and device complexity increases due to intrusive sensor retrofitting
Solution Approach 1:
The patent replaces direct mechanical measurement of valve lift with pressure-based measurement. Pressure sensors measure dome pressure and inlet pressure, and the controller calculates valve lift factor and flow capacity from these pressure readings using predetermined correlations, eliminating the need for linear position transducers and direct mechanical sensors on the valve
Solution Approach 2:
The patent uses pressure as an intermediary parameter to indirectly determine valve lift and flow capacity. Instead of directly measuring valve position or flow, the system measures dome pressure and inlet pressure, then uses these intermediate pressure measurements to calculate the desired flow capacity information through predetermined correlations
2Measurement precision
If intrusive sensor equipment is installed to measure valve lift, then measurement precision improves, but ease of operation deteriorates due to maintenance and certification requirements
Solution Approach 1:
The patent enables the relief valve assembly to self-report flow capacity information using its existing pressure sensing components (dome pressure sensor and inlet pressure sensor) that are already part of the valve's normal operation. The controller within the assembly performs the calculations using predetermined correlations stored in memory, eliminating the need for external intrusive sensors and their associated maintenance and certification
3Measurement precision
If direct measurement of piston displacement is performed, then measurement precision improves, but device complexity increases due to additional instrumentation
Solution Approach 1:
The patent replaces direct mechanical measurement of piston displacement with pressure-based measurement. The system uses pressure sensors to measure dome pressure and inlet pressure, then the controller calculates valve lift factor (which correlates to piston displacement) from these pressure readings using predetermined correlations, eliminating linear position transducers and direct mechanical displacement sensors
Solution Approach 2:
The patent changes the measurement parameter from direct mechanical displacement to pressure. By measuring dome pressure and inlet pressure and using predetermined correlations to calculate valve lift factor, the system obtains accurate piston displacement information through a different physical parameter that requires less intrusive instrumentation
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, supporting compliance with environmental and safety regulations by determining flow capacity based solely on pressure measurements, reducing operational complexity and costs.
Implementation Method 1
a pressure detection assembly 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.