Protection Valve Flow Comparison for Leak Detection in Pipe Loops
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Solution Overview
Problem
Existing safety shutoff valves in district heating and hydraulic systems are unreliable in detecting leaks distant from the valve, prone to false alarms, and require external power, failing to effectively prevent fluid leakage and maintain system functionality.
Innovation Solution
A protection valve arrangement with separate fluid transit chambers and flow measuring means that detect deviations in fluid flow rates using mechanical force coupling, allowing the valve to automatically block fluid flow without external energy, ensuring reliable leak detection and prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known safety shutoff valves are used to detect leaks, then the valve can block fluid flow in case of pressure drop, but the valve is unreliable for distant leaks and prone to false alarms
Solution Approach 1:
The system is divided into multiple independent monitoring zones with individual protection valves at different locations along the pipe loop. Each valve monitors its specific section independently, allowing accurate localization of leaks without false alarms from distant pressure changes. This segmentation enables reliable detection while maintaining system operation in unaffected zones.
Solution Approach 2:
A centralized control unit acts as an intermediary that receives flow rate data from all protection valves and coordinates system-wide responses. The control unit analyzes patterns across multiple valves to distinguish actual leaks from temporary flow variations, preventing false alarms while maintaining high reliability in leak detection.
2Reliability
If safety shutoff valves are installed to prevent fluid leakage, then leak prevention is possible, but the valves require external power supply which reduces reliability
Solution Approach 1:
Each protection valve is equipped with local flow rate sensors and an integrated control mechanism that operates autonomously without external power. The valve monitors its own section's flow rate and automatically closes when a leak is detected, making the system self-sufficient and highly reliable even during power outages.
Solution Approach 2:
The system replaces electrically actuated valves with mechanically operated protection valves that use spring-loaded closing mechanisms and pneumatic actuators driven by pressure differential. This mechanical substitution eliminates dependency on external power supplies while maintaining rapid response capability for leak prevention.
3Speed
If pressure drop-based shutoff valves are used, then the system can respond to leaks, but devices farther from the valve experience delayed or missed detection
Solution Approach 1:
The pipe loop is divided into multiple monitoring sections with protection valves positioned at strategic locations. Each valve monitors flow in its immediate vicinity, enabling rapid local response to leaks regardless of their position in the system. This eliminates the distance-related detection delays inherent in centralized pressure drop valves.
Solution Approach 2:
Protection valves are pre-positioned at multiple locations along the pipe loop before leaks occur. Each valve is pre-configured with flow sensors and closing mechanisms ready to activate immediately upon detecting abnormal flow patterns in its section, ensuring rapid response without waiting for pressure waves to travel from distant leak points.
4Reliability
If centralized safety shutoff valves are used, then the system can block fluid flow, but all devices are shut down when a leak occurs
Solution Approach 1:
The system uses multiple independently operated protection valves positioned at different locations, each controlling its own section of the pipe loop. When a leak is detected, only the specific valve in that section closes, isolating the problem area while allowing the rest of the system to continue operating normally, thus maintaining productivity while ensuring safety.
Solution Approach 2:
Each protection valve is designed to operate independently based on local flow conditions in its specific section. The valve closing action is localized to only the necessary area, allowing different parts of the system to have different operational states - shut down where needed for safety, running where safe - optimizing both reliability and productivity simultaneously.
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 solution effectively detects leaks in pipe loops by comparing inflow and outflow rates, preventing further fluid flow and maintaining system integrity without power supply, reducing false alarms and ensuring safety against high-pressure fluid leaks.
Implementation Method 1
flow measuring means (3, 3') that detect deviations in fluid flow rates using mechanical force coupling
Implementation Method 2
whose drag force produced by fluid flow through said fluid transit chamber is a function of the rate of the fluid flow
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a protection valve (1) to avoid severe leakage of a fluid in a pipe loop (101) with an inlet and an outlet. The protection valve (1) comprises a first and a separate second fluid transit chamber (2, 2') each with a flow measuring means (3, 3') that provides a mechanical force as a function of the rate of fluid flow through the respective fluid transit chamber (2, 2'), wherein the two flow measuring means (3, 3') are force-coupled and configured for the force coupling to remain stationary when the rate of fluid flow through both transit chambers (2, 2') fulfil a predefined fluid flow ratio. The protection valve (1) further comprises a first valve (9) to selectively block the fluid flow through the first fluid transit chamber (2), wherein the first valve (9) is linked to the force coupling to be moved from an open to a closed position in case the force coupling is actuated due to a deviation from said predefined fluid flow ratio. The invention also relates to an arrangement of a protection valve (1) according to the invention and a closed pipe loop (101), wherein fluid before entering the closed pipe loop (101) at its inlet is routed through the first fluid transit chamber (2) of the protection valve (1) and the fluid when leaving the pipe loop (101) at its outlet is routed through the second fluid transit (2') chamber of the protection valve (1).