Spring-Loaded Safety Valve Dynamic Testing With Pressure and Stem Sensing
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Solution Overview
Problem
Current methods for testing the dynamic characteristics of spring-loaded safety valves lack accuracy and efficiency, particularly in monitoring inlet pressure, valve stem displacement, and gas mass flow, which are crucial for ensuring the accurate opening, stable emission, and rapid return of safety valves.
Innovation Solution
A test device comprising a gas supply system, air pressure stabilizer, quick start and stop device, pipeline air pressure and gas mass flow detecting devices, safety valve stem displacement sensor, and an acquisition system, which includes sensors and a PLC system for real-time data collection and processing, enabling precise control and stabilization of pressure and flow during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional test methods are used for safety valve dynamic characteristics, then the test structure is simple, but the test accuracy is low and test functions are limited
Solution Approach 1:
The test device is divided into multiple independent functional modules: gas supply device with double cylinder air compressor, air pressure stabilizer with electric valve, quick start and stop device with electromagnetic valve, multiple detecting devices (pipeline air pressure, gas mass flow, safety valve stem displacement), and acquisition system. Each module performs a specific function, allowing the system to achieve high measurement precision through specialized sensors while maintaining manageable complexity through modular design.
2Measurement precision
If multiple parameters are monitored simultaneously for accurate dynamic characteristics testing, then test accuracy improves, but device complexity increases
Solution Approach 1:
The acquisition system serves multiple functions: it collects data from all detecting devices (air pressure sensors, gas mass flow sensor, displacement sensor), processes the signals, and provides comprehensive analysis of dynamic characteristics. This multi-functional integration allows simultaneous monitoring of multiple parameters without proportionally increasing overall system complexity, as the acquisition system handles all measurement tasks centrally.
Solution Approach 2:
The acquisition system acts as an intermediary between the various detecting devices and the control/display systems. It receives signals from multiple sensors, processes and standardizes the data, and provides unified output for analysis. This intermediary role allows multiple detecting devices to work together seamlessly without requiring complex direct connections between each sensor, thereby managing system complexity while achieving high measurement precision.
3Stability of the object's composition
If electric valve is used for pressure stabilization with feedback control, then pressure stability improves, but device complexity and control system complexity increase
Solution Approach 1:
The air pressure stabilizer uses a feedback control mechanism where air pressure sensors continuously monitor the gas pressure in the pressure vessel and send signals to the electric valve. Based on the feedback signal, the electric valve automatically adjusts its opening degree to maintain stable pressure. This feedback loop achieves excellent pressure stability without requiring complex manual control systems, as the automated feedback mechanism handles pressure regulation dynamically.
4Speed
If electromagnetic valve is used for quick start and stop control, then response speed improves, but device complexity increases compared to manual valves
Solution Approach 1:
The quick start and stop device replaces manual mechanical valve operation with an electromagnetic valve that can be controlled electrically. This substitution of mechanical control with electromagnetic actuation achieves rapid response speed for starting and stopping gas flow, as electromagnetic valves can open and close much faster than manual valves. The increased complexity is offset by the automated control capability and rapid response performance.
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 solution provides high accuracy and abundant test functions, enabling the precise evaluation of safety valve dynamic characteristics, including accurate opening, stable emission, and timely return, thereby enhancing the performance and reliability of safety valves.
Implementation Method 1
an air pressure sensor A4, a pressure relief valve 5 and a pressure gauge 6. The left end of the connecting pipe B19 is connected with the right end of the ball valve 17 through the thread; the left end of the electric valve 3 is connected with the right end of the connecting pipe B19 through a flange
Implementation Method 2
The quick start and stop device is an electromagnetic valve 14 arranged on the right end of the pressure vessel 15 and used for controlling the outflow of gas in the pressure vessel 15
Implementation Method 3
a laser displacement sensor 9 for monitoring the change of the displacement of a safety valve stein 41 in real time
Implementation Method 4
a pipeline gas mass flow detecting device, a safety valve stein displacement detecting device
Implementation Method 5
The spring-loaded safety valve uses the force generated by the compression of the spring to balance the pressure on a valve flap and seal a contact surface between the valve flap and a valve seat
Data Source
AI summary
A test device and a test method for dynamic characteristics of a spring-loaded safety valve are mainly used for testing opening, emission and return seat characteristics of the safety valve. The air pressure stabilizer is used for stably adjusting gas pressure in a pressure vessel. The quick start and stop device is used for controlling opening and closing of the pressure vessel. The pipeline gas mass flow detecting device is used for detecting the mass flow of the gas in a pipeline. The safety valve stem displacement detecting device is used for detecting the displacement change of a safety valve stem. The acquisition system is used for collecting, processing and saving experimental data. The device of the present invention has simple structure and high precision, and provides guarantee for the test of the dynamic characteristics of the safety valve.