Fluid Valve Positioner Redundant Transducers Safety
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Solution Overview
Problem
Process control systems face increased downtime and undesirable operating conditions due to valve failures or degradation, which can be mitigated by implementing redundant safety systems in fluid valves.
Innovation Solution
A positioner apparatus with an actuation module and a trip circuit, featuring redundant transducers to control fluid pressure and valve position, ensuring reliable operation during safety events by providing redundancy to venting and charging functionalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant safety systems are implemented in fluid valves, then reliability is improved, but device complexity increases
Solution Approach 1:
The positioner system is segmented into distinct functional modules: actuation module with first transducer, trip circuit with second transducer, and fluid supply line. This segmentation allows redundancy to be implemented through modular components that can independently fail without compromising the entire system, thereby improving reliability while managing complexity through organized modularity.
Solution Approach 2:
The trip circuit is designed with beforehand cushioning through the second transducer that can independently actuate the valve to a safe state if the primary actuation module fails. This preventive redundancy ensures that potential failures are compensated for in advance, maintaining reliability without requiring complex real-time monitoring systems.
2Reliability
If transducers are made redundant to prevent failure, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The redundant transducers are segmented into different functional roles: the first transducer in the actuation module for normal operation and the second transducer in the trip circuit for safety backup. This functional segmentation allows each transducer to be optimized for its specific role, potentially reducing individual component costs while achieving overall system reliability through redundancy.
Solution Approach 2:
The trip circuit with the second transducer serves as a simplified copy of the primary actuation function. Rather than duplicating the entire actuation module, the trip circuit implements a comparable but potentially less complex transducer-based safety mechanism that provides redundancy at lower manufacturing cost.
3Reliability
If the trip circuit is placed between the actuation module and actuator, then safety function is improved, but device complexity increases
Solution Approach 1:
The trip circuit acts as an intermediary layer between the actuation module and the actuator. The second transducer in the trip circuit serves as a mediator that can independently control fluid flow to the actuator, providing a safety backup path without requiring complex integration with the primary actuation system. This intermediary structure simplifies the redundancy implementation while maintaining safety function 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
The positioner apparatus enhances the robustness of fluid valves by ensuring continued safe operation even if individual transducers fail, reducing downtime and maintaining system integrity during valve actuation.
Implementation Method 1
the actuation module having a first transducer to change one or more parameters of the fluid
Implementation Method 2
the trip circuit having a second transducer to change the one or more parameters of the fluid
Data Source
AI summary
Methods, apparatus, systems and articles of manufacture are disclosed for a positioner apparatus for use with fluid valves. An example apparatus includes a fluid valve, an actuator operatively coupled to the fluid valve, and a positioner fluidly coupled to the actuator to control a position of the fluid valve via a fluid provided from a fluid supply line, the positioner having first and second transducers configured to increase or decrease a pressure of the fluid in the actuator, the positioner to enable the first and second transducers to change the position of the fluid valve during a safety event.