Back Pressure Relief Valve Failure Detection Using Pressure Monitoring
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Solution Overview
Problem
Pressure relief valves in fluid systems face challenges with back pressure, leading to potential failures and unintended venting of fluids to the atmosphere, which existing technologies struggle to detect and manage effectively.
Innovation Solution
A back pressure balanced relief valve system that includes a piston, a balancing device (such as a bellows or diaphragm), and pressure sensors to monitor pressure chambers for indications of potential failures, providing alerts and calculating leak rates to mitigate these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure relief valves are used in systems with back pressure, then pressure protection is provided, but potential failures and unintended venting to atmosphere occur that are difficult to detect
Solution Approach 1:
A pressure sensor is introduced as an intermediary device to monitor the pressure chamber between the piston and bellows/diaphragm. The sensor provides indirect detection of balancing device integrity by measuring pressure differentials, enabling early warning of failures before unintended venting occurs.
Solution Approach 2:
The system implements continuous pressure monitoring with feedback to a control system. When pressure differentials indicate potential failure (such as loss of vacuum or unexpected pressure changes), the control system generates alerts, enabling proactive maintenance and preventing catastrophic failures.
2Duration of action of stationary object
If back pressure balanced relief valves operate continuously, then pressure protection is maintained, but undetected failures lead to fluid loss and environmental contamination
Solution Approach 1:
The pressure monitoring system performs preliminary detection of potential failures by continuously measuring pressure differentials in the balancing device. By detecting early signs of bellows or diaphragm degradation, the system enables maintenance before actual fluid loss occurs, preserving substance during continuous operation.
3Difficulty of detecting and measuring
If pressure sensors and monitoring systems are added to detect failures, then failure detection capability is improved, but system complexity increases
Solution Approach 1:
The pressure monitoring system leverages the existing pressure differential that naturally exists in back pressure balanced relief valves during normal operation. The same pressure differential that enables back pressure compensation also serves as the detection mechanism for failures, eliminating the need for separate complex detection mechanisms.
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
The system effectively detects potential failures and malfunctions, preventing fluid venting to the atmosphere and maintaining valve performance by monitoring pressure changes and providing timely alerts and calculations for maintenance.
Implementation Method 1
The pressure sensor can be in fluid communication with the pressure chamber, and can be configured to monitor the pressure in the pressure chamber for indications of a potential failure of the one of the bellows or the diaphragm.
Implementation Method 2
A piston, one of a bellows or a diaphragm, and a pressure sensor. A pressure chamber can be created between the piston and the one of the bellows or the diaphragm.
Data Source
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AI summary
A relief valve (200; 300) comprises a valve body (204; 304) that includes an inlet nozzle and an outlet. A disc holder (208; 308) is configured to move relative to the inlet nozzle to permit or restrict flow from the inlet nozzle to the outlet. A bonnet (212; 312) is coupled to the valve body (204; 304). A spring within the bonnet (212; 312) applies a force to the disc holder (208; 308) to urge the disc holder toward the inlet nozzle. A diaphragm (232; 332) is provided, through which the disc holder (208; 308) extends, wherein an outer portion of the diaphragm (232; 332) is disposed between the valve body (204; 304 and the bonnet 212; 312), and wherein the diaphragm (232; 332) fluidly isolates the bonnet (212; 312) from an interior of the inlet nozzle.