Buoyancy Vent Valve Segmented Spring Centering
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Solution Overview
Problem
Contemporary vent valves for buoyancy compensation devices in SCUBA diving suffer from reliability issues due to uneven spring force causing misalignment, jerky operation leading to valve plug displacement, and inability to maintain dual flow rates for over-pressure and manual dump functions, with limitations in pneumatic and hydraulic actuation, and lack of fail-safe mechanisms.
Innovation Solution
A vent valve design featuring a spring fully restrained for more than 50% of its length, with a centering mechanism to prevent lateral or angular movement of the valve plug, allowing for both manual and powered actuation, and incorporating a piston to manage flow rates, ensuring reliable operation and fail-safe closure in case of power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a compression spring is used to apply force to the valve plug, then the valve can be actuated, but the spring applies uneven force causing the valve plug to move at an angle to the valve seat, reducing reliability
Solution Approach 1:
The spring is segmented into multiple sections with different stiffness characteristics. The first section has a first stiffness and the second section has a second stiffness, allowing the spring to apply more uniform force distribution to the valve plug while maintaining actuation capability. This segmentation resolves the contradiction by enabling both valve actuation and reliable seating.
Solution Approach 2:
Different sections of the spring are designed with different local properties (stiffness values). The first section has different stiffness characteristics than the second section, creating localized force distribution that ensures uniform contact between the valve plug and valve seat. This local quality variation solves the uneven force application problem while preserving actuation function.
2Stability of the object's composition
If a deeper channel is used to keep the spring in position, then the spring can be retained, but the valve plug remains free to move at an angle to the seat, causing incorrect seating
Solution Approach 1:
The spring is divided into sections with different stiffness values, where the first section provides positional stability in the channel while the second section ensures proper force application to the valve plug. This segmentation allows the spring to be restrained without compromising valve plug alignment, resolving both stability and reliability concerns.
Solution Approach 2:
The stiffness parameter of the spring is varied along its length, with the first section having a first stiffness and the second section having a second stiffness. This parameter change enables the spring to maintain position stability while simultaneously ensuring proper valve plug orientation and seating reliability.
3Adaptability or versatility
If a pneumatic piston is added to drive the valve plug, then the valve can be actuated by a buoyancy controller, but the sharp edge of the plug and uneven spring force reduce reliability
Solution Approach 1:
The spring is designed with non-uniform local quality, having different stiffness in its first and second sections. This local variation compensates for the sharp edge effect of the valve plug and ensures uniform force distribution even when actuated by a pneumatic piston, maintaining reliability while enabling powered actuation.
Solution Approach 2:
The spring stiffness parameter is changed along its length, with the first section having different stiffness than the second section. This parameter gradient ensures that even with the sharp edge geometry required for pneumatic actuation, the spring applies sufficient and uniform force to ensure reliable valve seating.
4Device complexity
If a single vent valve is used for over-pressure relief, then the structure is simple, but it cannot provide both high flow rate for over-pressure and low flow rate for automatic control simultaneously
Solution Approach 1:
The valve is designed with dynamic flow rate capability, where the flow rate can vary between high (for over-pressure relief) and low (for automatic control) based on operating conditions. The spring's segmented stiffness and the valve plug geometry enable this dynamic adaptation, providing dual functionality in a single valve structure.
Solution Approach 2:
The single vent valve is designed to perform multiple functions: over-pressure relief requiring high flow rate and automatic buoyancy control requiring low flow rate. The segmented spring design and valve geometry enable this universal functionality, allowing one valve to replace what would traditionally require multiple specialized valves.
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 a highly reliable vent valve with consistent seating, dual flow rates, and fail-safe operation, ensuring safe and efficient gas management during SCUBA diving, including over-pressure relief and manual control, even in the absence of pneumatic or hydraulic power.
Implementation Method 1
a spring (5) configured to apply a force to the valve plug (29) to close the valve seat (30)
Implementation Method 2
a piston (27) configured to apply a force to the valve plug (29) to open the valve seat (30)
Data Source
AI summary
A vent valve for a buoyancy control device suitable for divers, where the valve may be opened by any combination of over-pressure, manual pressure relief or a powered means, where a force to a valve plug is applied by means of a spring that is constrained to prevent entirely lateral and angular movement but in which movement of the plug in the axis of the seat is unconstrained.