Ball Valve Torque Sensing and Leak Diagnostics
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Solution Overview
Problem
Industrial ball valves face challenges in detecting malfunction and component failures, particularly in measuring on-stem valve torque and position, valve seat leaks, stem packing leaks, and pipeline pig position, which hinders efficient maintenance and performance monitoring.
Innovation Solution
A diagnostic and performance monitoring system is integrated into ball valves, featuring sensors, a logic solver, and communication devices to quantify and measure these parameters, including a seat leak flow apparatus, stem packing leak detectors, and pipeline pig location sensors, enabling real-time data logging and remote evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional valve designs are used without diagnostic systems, then the valve structure remains simple and cost-effective, but the ability to detect malfunction and component failures is insufficient
Solution Approach 1:
The diagnostic system is nested within the valve structure by integrating sensors into the valve body, stem, and actuator components. The sensors are housed within existing valve cavities and passages, allowing the diagnostic functionality to be embedded without adding external complexity to the overall valve assembly.
Solution Approach 2:
The valve stem serves multiple functions: it transmits actuator motion to the ball, supports the torque sensor, and provides a mounting structure for the position sensor. This multi-functionality reduces the need for separate diagnostic components, thereby limiting the increase in device complexity.
2Measurement precision
If multiple sensors are integrated into the valve to measure torque, position, and leaks, then measurement precision improves, but device complexity increases
Solution Approach 1:
The torque sensor and position sensor are combined in the valve stem assembly, with the torque sensor integrated into the stem structure and the position sensor mounted on the same assembly. This merging of measurement functions into a single location reduces the number of separate sensor systems required and simplifies the overall integration process.
Solution Approach 2:
A magnetic coupling mechanism serves as an intermediary between the moving ball and the stationary sensor, allowing non-contact measurement of valve position. This intermediary approach enables precise measurement without requiring direct mechanical contact between the sensor and the moving parts, thereby reducing mechanical complexity.
3Ease of operation
If diagnostic systems are added to monitor valve performance in real-time, then maintenance accessibility improves, but the device complexity and cost increase
Solution Approach 1:
The diagnostic system provides continuous feedback on valve performance parameters including torque, position, and leak detection. This feedback mechanism enables real-time monitoring of valve condition, allowing maintenance personnel to assess valve health and plan maintenance activities proactively, thereby improving maintenance accessibility and reducing unplanned downtime.
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 enhances maintenance accessibility, detects leaks and misalignments, and monitors valve performance, preventing damage and ensuring optimal operation by providing precise data on valve conditions and performance deviations.
Implementation Method 1
a first hall-effect sensor aligned with the first magnet and mounted in the actuator flange; a second hall-effect sensor aligned with the second magnet
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A ball valve is described for use in industrial plants. The valve includes: a valve body; a valve stem (509) extending from the valve body through a valve gland (500), a valve-actuator interface flange (502), and an actuator flange (450); a first magnet (452) and a second magnet (456, 480) mounted on the valve stem; a first hall-effect sensor (454) aligned with the first magnet and mounted in the actuator flange; a second hall-effect sensor (455, 481) aligned with the second magnet; and an electronic control system in communication with the first hall-effect sensor and the second hall- effect sensor, the electronic control system configured to estimate torque exerted on the valve stem.