Valve Assembly Multi-Mode Safety Response
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Solution Overview
Problem
Existing valve assemblies are not adequately designed to respond to multiple modes of failure, such as leaks or external pressures, and are not suitable for high-pressure gas applications, limiting their safety and operational effectiveness.
Innovation Solution
A valve assembly with a primary and secondary passageway system, where the valve is movable between open and closed positions in response to pressure differences between the two passageways and the environment, incorporating a spring-loaded ball and piston mechanism, along with a fusible plug for temperature-induced safety modes, ensuring fluid isolation in various failure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-mode safety valve is used, then the valve can respond to one specific failure mode, but it cannot respond to multiple different failure modes (leaks, external pressures, temperature extremes)
Solution Approach 1:
The valve assembly is divided into multiple independent safety mechanisms: a primary pressure-responsive valve for pressure failures, a thermal fuse for temperature failures, and a secondary check valve for leak detection. Each segment responds to a specific failure mode, collectively providing multi-mode safety coverage without requiring a complex single mechanism.
Solution Approach 2:
The valve assembly integrates multiple functions into a single device: pressure regulation, temperature response, leak detection, and flow control. This multi-functional design allows one valve assembly to respond to various failure modes (pressure spikes, temperature extremes, leaks) that would otherwise require separate devices.
2Stress or pressure
If existing valves are used for high-pressure gas applications, then standard valve designs can be implemented, but they are not suitable for high-pressure gas and lack adequate safety responses
Solution Approach 1:
The valve is designed with specific parameter optimizations for high-pressure gas: the spring-loaded mechanism uses high-strength springs calibrated for gas pressures, the thermal fuse uses materials with appropriate melting points for high-temperature gas environments, and the valve body uses pressure-rated materials and geometries. These parameter changes enable safe operation in high-pressure gas applications where standard valves would fail.
3Device complexity
If a simple valve design is used, then the device complexity is low, but it cannot independently manage different failure modes and environmental conditions
Solution Approach 1:
The valve assembly uses simple, discrete components for each safety function: a spring-loaded valve element, a thermal fuse, and a check valve. Each component is mechanically simple and can be independently analyzed, yet together they provide sophisticated multi-mode safety responses. The segmentation allows each simple component to excel at its specific function without requiring complex integration.
4Extent of automation
If passive safety mechanisms are used, then the valve responds automatically to failures, but the response is limited to single failure modes
Solution Approach 1:
The passive safety system incorporates multiple automatic response mechanisms: pressure changes automatically actuate the spring-loaded valve, temperature changes automatically melt the thermal fuse to close the valve, and leaks automatically trigger the check valve. Each mechanism is purely passive and automatic, yet the combination provides comprehensive safety coverage for multiple failure modes without requiring active control systems.
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 valve assembly effectively closes in response to leaks, external pressure changes, and temperature extremes, providing enhanced safety and reliability in high-pressure gas applications by independently managing different failure modes and environmental conditions.
Implementation Method 1
The valve is movable between a first position where the primary passageway is open and fluid communicates between the first end and the second end of the primary passageway, and a second position where the primary passageway is closed and fluid is prevented from communicating between the first end and the second end of the primary passageway. The valve is adapted to be movable to the first and second positions in response to the second pressure in the secondary passageway.
Implementation Method 2
A fusible plug is disposed on the secondary passageway. When a temperature is below a predetermined temperature the fusible plug is adapted to isolate the second fluid line from the environment. When the temperature is above predetermined temperature the fusible plug is adapted to at least partially communicate the second fluid line with the environment.
Data Source
AI summary
A valve assembly adapted to be used in an environment having an environment pressure includes a body having an end adapted to connect to a pipe having a first fluid line at a first pressure and a coaxial second fluid line at a second pressure. A primary passageway defined through the body is adapted to be connected to the first fluid line. A secondary passageway defined in the body is adapted to be connected to the second fluid line. A valve is disposed on the primary passageway. The valve is movable between a first position where the passageway is open and a second position where the passageway is closed in response to the second pressure in the secondary passageway. The first pressure in the primary passageway is greater than the second pressure in the secondary passageway, and the environment pressure is greater than the second pressure in the secondary passageway.