Pneumatic Process Valve Partial Stroke Testing With Pressure Feedback
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Solution Overview
Problem
Existing process valve apparatuses lack a reliable method to detect the functioning and wear of the valve, which can compromise safety and efficiency in process automation.
Innovation Solution
The process valve apparatus is equipped with a control device that detects pressure information during a partial stroke test, using variables such as breakaway pressure values and drive pressure ranges to determine the status of the valve, thereby enhancing safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If partial stroke test is performed without pressure information detection, then the testing process is simple and quick, but the reliability of status determination is insufficient
Solution Approach 1:
The control device detects pressure information from the pneumatic actuation system during partial stroke testing and uses this feedback to determine the functioning status and wear of the valve apparatus. This feedback mechanism enables reliable status assessment without requiring complex additional testing equipment.
Solution Approach 2:
The existing pneumatic actuation system's pressure information is utilized for self-diagnosis purposes. The control device monitors pressure variables already present in the system during normal operation and testing, eliminating the need for separate diagnostic equipment and reducing overall system complexity.
2Reliability
If pressure information detection is implemented, then the status information determination becomes more reliable, but the device complexity increases
Solution Approach 1:
The control device performs multiple functions: it controls the pneumatic valve device for actuation, monitors pressure information during operation and testing, and determines status information based on this data. By making the control device multi-functional, no additional dedicated monitoring equipment is required, thus avoiding increased device complexity while improving reliability.
3Measurement precision
If comprehensive pressure variables are monitored, then the measurement precision of status assessment is improved, but the loss of information processing increases
Solution Approach 1:
The control device extracts and monitors specific critical pressure variables (such as breakaway pressure, maximum drive pressure, minimum drive pressure) from the overall pressure information during partial stroke testing. By focusing on these key parameters rather than processing all possible pressure data, measurement precision is maintained while data processing load is minimized.
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
By utilizing pressure information, the control device can more reliably assess the status of the process valve apparatus, leading to increased safety and improved operational efficiency.
Implementation Method 1
a pneumatic valve drive (3) for actuating the valve member (2), and a control device (4) with a pneumatic valve device (5) for pneumatically actuating the valve drive (3)
Implementation Method 2
The control device (4) is configured to detect pressure information related to the pneumatic actuation of the valve drive (3) during the partial stroke test
Data Source
AI summary
A process valve apparatus includes a process fitting, a pneumatic valve drive and a control device with a control unit. The control device is configured to carry out a partial stroke test. The control unit is configured to control a valve device of the control device with an electrical control signal in order to effect a pneumatic actuation of the valve drive. The control device is configured to perform a plurality of partial stroke tests and the control unit is configured to provide the electrical control signal with the same control signal values for each partial stroke test.