Pressure Relief Valve Spring Force Containment Assembly
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Solution Overview
Problem
Pressure relief valves with spring-powered mechanisms face risks of unpredictable energy release during disassembly or component failure, leading to potential accidents.
Innovation Solution
A secondary spring force containment assembly is introduced, which includes a canister and hollow rod to capture and control the spring force, ensuring it is directed safely during disassembly and potential failures, by compressing the spring to a force less than the pressure relief setting and securing it between proximal and distal seats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compression spring is used to maintain the valve in closed condition, then the valve can effectively hold pressure below the pre-determined level, but the spring can release stored energy in unpredictable directions during disassembly or component failure
Solution Approach 1:
A stem extension with a nut is introduced as an intermediary mechanism between the compression spring and the valve closure member. This intermediary allows controlled compression and secure containment of the spring, preventing unpredictable energy release while maintaining the valve's pressure holding capability. The nut acts as a mediator that safely manages the spring's stored energy.
Solution Approach 2:
The spring is compressed and secured in a predetermined, controlled state before the valve is assembled or during maintenance. The stem extension and nut are used to pre-compress and contain the spring at a safe position, ensuring that the spring's energy is controlled before any potential failure or disassembly occurs.
2Manufacturing precision
If the spring is compressed to set the correct height during assembly, then the valve closure member is properly positioned, but removing the setting component during service can cause accidental spring force release
Solution Approach 1:
The design allows the spring compression state to be dynamically adjusted and secured using the stem extension and nut during assembly, and then locked in place for safe maintenance. The system transitions from a static, potentially dangerous compression method to a dynamic, controllable compression mechanism that can be safely adjusted and then secured.
Solution Approach 2:
The stem extension and nut provide a beforehand cushioning mechanism that prevents accidental spring release during maintenance. By securing the spring in a controlled compressed state before any disassembly occurs, the design cushions against potential harmful energy release during service operations.
3Manufacturing precision
If the stem passes through the center of the coil spring for height setting, then the spring compression is controlled, but stem breakage or component failure can release spring force in unpredictable directions
Solution Approach 1:
The stem is segmented into multiple components: the original stem and an additional extension portion with a nut. This segmentation allows the spring to be compressed and secured independently of the main stem structure, so that even if the stem breaks, the spring remains contained and controlled by the extension and nut.
Solution Approach 2:
The stem extension with nut serves as an intermediary that decouples the spring containment function from the stem's primary valve actuation function. This intermediary ensures that spring force control is maintained even if the stem fails, as the extension and nut provide an independent containment mechanism.
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 secondary spring force containment assembly effectively reduces the risk of accidental release of spring forces, ensuring safe operation and maintenance of pressure relief valves by capturing and controlling the spring energy during disassembly and potential failures.
Implementation Method 1
Pressure relief valves typically use a compression spring to maintain the valve in a closed condition. When the pressure in the tank exceeds a pre-determined level, the spring force holding the valve in the closed condition is overcome
Implementation Method 2
the spring can release stored energy in unpredictable directions
Data Source
AI summary
A valve having secondary spring force containment includes a valve body featuring an opening with a valve closure member sized to close the opening. A stem has a first end connected to the valve closure member. A proximal spring seat is positioned adjacent to the valve body, A distal spring seat is mounted on the second end of the stem. A spring is positioned between the proximal and distal spring seats so that the valve closure member is urged into a position where the valve body opening is closed. A hollow rod is attached between the proximal and distal spring seats to provide secondary spring force containment with the stem passing through the hollow rod.