Valve Wear Diagnosis via Drive Chamber Pressure Analysis
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Solution Overview
Problem
Existing valve arrangements for controlling process medium flow in pipelines face challenges in diagnosing operating states due to high maintenance requirements and sensitivity to contamination, particularly in the pilot valve arrangement, leading to potential system failures and operational standstills.
Innovation Solution
A method and valve arrangement that utilize a pressure sensor to measure pressure in the drive chamber and analyze pressure changes over time to determine the flow and ratio of drive chamber volume to effective opening cross section, allowing for monitoring of the valve arrangement's operating state without additional sensors or position sensor data, using a single pressure sensor and specific formulas to assess the system's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors and position sensor data are used to monitor the valve arrangement's operating state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple monitoring functions (pressure measurement, flow determination, operating state assessment) into a single integrated evaluation unit that processes data from one pressure sensor. This merging approach maintains comprehensive monitoring capability while reducing the number of separate sensors and simplifying the overall system architecture.
Solution Approach 2:
The evaluation unit is designed to perform multiple functions using a single pressure sensor: measuring pressure, determining flow rates, calculating the ratio of drive chamber volume to effective opening cross section, and assessing the overall operating state. This multi-functional approach eliminates the need for multiple specialized sensors while maintaining comprehensive monitoring.
2Reliability
If additional sensors are added to the valve arrangement for diagnostic purposes, then reliability of diagnosis is improved, but ease of operation deteriorates
Solution Approach 1:
The patent merges diagnostic functions into the existing control system's evaluation unit, which already processes control signals and position data. By integrating pressure measurement and diagnostic analysis into this existing multi-functional unit, the system achieves reliable diagnostics without adding separate operational interfaces or complicating the operator's workflow.
3Device complexity
If a single pressure sensor is used to determine flow and operating state, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent uses the pressure sensor as an intermediary to indirectly determine flow rates and operating state. Instead of directly measuring flow, the system measures pressure and uses the known relationship between pressure, drive chamber volume, and effective opening cross section to calculate flow. This indirect measurement approach maintains accuracy while simplifying the sensor system.
Solution Approach 2:
The system monitors changes in pressure over time (dp/dt) to determine flow rates and operating state. By focusing on pressure dynamics rather than static pressure values, the evaluation unit can accurately assess valve operation, seal integrity, and potential faults using a single pressure sensor.
4Reliability
If comprehensive monitoring of drive chamber pressure and flow is implemented, then reliability of operation is improved, but loss of energy increases
Solution Approach 1:
The evaluation unit utilizes existing system resources (power supply, processing capability, existing pressure sensor) to perform monitoring functions. The system essentially monitors itself using components already present in the valve arrangement, minimizing additional energy consumption while maintaining comprehensive operational reliability.
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 enables reliable and simple monitoring of the valve arrangement's operating state, reducing maintenance needs and preventing system failures by determining faults and changes in the valve mechanism without influencing the valve's movement, thus ensuring continuous operation.
Implementation Method 1
measuring in a pressure sensor (16) the pressure in at least one of the drive chamber (11) and a pneumatic part operatively connected to the drive chamber (11)
Implementation Method 2
analyzing the measured pressure in the evaluation unit (15) with respect to a pressure p and a pressure change dp(t) over time to determine at least one of the flow into/from the drive chamber (11)
Data Source
AI summary
A method and valve arrangement are provided for controlling the flow of a process medium through a pipeline. A pneumatic actuator moves a valve element, which is accommodated in a valve housing, and switches the flow of the process medium, in accordance with a positioning control system by means of a control piston, to at least one side of which control pressure is applied in a drive chamber. An electronic evaluation unit connected to the positioning control system monitors the operating state. A pressure sensor measures the pressure in the drive chamber, and the evaluation unit analyzes the measured pressure value with respect to a pressure p and the pressure change dp(t) over time to determine the flow into/from the drive chamber and/or the ratio (V/A) of the drive chamber volume to the effective opening cross section of the valve arrangement as a measure of the operating state of the valve arrangement.