Valve Operator Leak Detection Using a Sealed Sensor Cavity
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Solution Overview
Problem
Current fugitive emission detection methods for industrial valves are labor-intensive, limited in accuracy, and time-consuming, often requiring skilled labor and empirical data, and fail to detect all leaks, especially those not causing measurable temperature differentials or being influenced by external factors.
Innovation Solution
An integrated fugitive emissions detection system within the valve operator, comprising a sealed cavity with sensors to measure pressure and temperature, and a processor to monitor changes, providing direct detection of leaks by comparing these parameters, which can be locally or remotely processed and integrated into a network for continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual detection methods (audible noise, gas leak spray, traditional inspection) are used, then detection can be performed with simple equipment, but labor intensity increases and detection accuracy is limited
Solution Approach 1:
The patent replaces manual mechanical detection methods with an automated sensor-based system. Pressure sensors and temperature sensors automatically monitor the cavity conditions, eliminating the need for manual inspection while improving detection accuracy through continuous electronic measurement and comparison of parameter changes.
2Extent of automation
If Infrared Temperature measurement tools are used, then detection can be automated, but not all leaks can be detected and external temperature factors reduce accuracy
Solution Approach 1:
The patent introduces a sealed cavity as an intermediary between the valve stem passage and the external environment. This cavity isolates the detection system from external temperature influences while still allowing fugitive emissions to enter and be detected through pressure and temperature parameter changes, thereby improving measurement precision.
3Adaptability or versatility
If Acoustic Emissions systems are used, then indirect leakage indication can be obtained, but extensive tailoring and empirical data are required
Solution Approach 1:
The patent creates a universal detection system that can be applied to various valve types without extensive customization. The sealed cavity design and parameter comparison method work across different valve configurations, eliminating the need for extensive empirical data and tailoring while reducing system complexity.
4Measurement precision
If Ultrasonic Stethoscopes are used, then leak paths can be identified, but skilled operators are required and nearby noise must be filtered
Solution Approach 1:
The patent implements a self-service detection system where the sensors automatically monitor and compare pressure and temperature parameters without requiring skilled operators. The system autonomously identifies leaks through parameter changes, eliminating the need for expert interpretation while maintaining high detection precision.
5Reliability
If continuous monitoring is implemented, then prompt leak detection is achieved, but system complexity and cost increase
Solution Approach 1:
The patent uses a simplified approach by monitoring parameter changes (pressure and temperature) rather than implementing complex continuous analysis systems. The sealed cavity acts as a simplified model that amplifies leak effects into measurable parameter changes, enabling reliable continuous monitoring with minimal system complexity.
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 solution enables efficient, accurate, and direct detection of fugitive emissions at a convenient location, reducing labor requirements, minimizing external noise interference, and providing prompt notification for timely repairs, thus reducing environmental contamination and maintenance costs.
Implementation Method 1
a processing unit communicably connected to the input and configured to receive the data from the input and monitor changes in the amount of substance within the cavity by comparison of changes in temperature and pressure within the cavity
Data Source
AI summary
A valve operator for a valve includes a valve operator housing defining at least one cavity and positioned to be at least partially contiguous with a valve stem passage of the valve. The cavity has a fixed volume and is sealed from the exterior environment. The valve operator includes a fugitive emissions detector having at least one sensor for measuring the pressure and temperature of the fluid within the interior of the cavity. The detector also includes a processor having an input for receiving data from the at least one sensor, a processing unit connected to the input to receive the data from the input and monitor changes in the amount of substance within the cavity by comparison of changes in temperature and pressure within the cavity and an output for providing an indication of fugitive emissions when the processor indicates an increase in substance within the cavity.