Tapered Needle Plug for Float Pneumatic Valve Sealing
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Solution Overview
Problem
Existing float operated pneumatic valve assemblies require high forces to seal the bleed port, making them less reliable and limiting coupling options, and lack externally adjustable block and bleed valve arrangements.
Innovation Solution
A tapered needle plug is used for the bleed port in a float operated pneumatic valve assembly, with a switch magnet and needle plug mechanism that reduces sealing forces and allows for a block and bleed valve arrangement that is externally adjustable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pad or flap is used to control the pneumatic valve, then the valve can be operated, but large forces are required to seal the port
Solution Approach 1:
The patent changes the geometric parameters of the sealing interface by using a tapered needle plug instead of a flat pad or flap. The tapered geometry concentrates the sealing force along a smaller contact area, reducing the total force required while maintaining effective sealing. This parameter change in the sealing mechanism geometry directly resolves the contradiction between sealing reliability and force requirement.
Solution Approach 2:
The needle plug employs a curved, tapered surface instead of a flat sealing surface. This curvature allows for more uniform stress distribution and better sealing contact, achieving reliable sealing with reduced force requirements compared to flat pad or flap designs.
2Adaptability or versatility
If a powerful magnet is used in magnet coupling, then the float can be coupled to the pneumatic valve, but the device complexity and coupling force requirements increase
Solution Approach 1:
The patent replaces the direct mechanical linkage between float and valve with a magnetic coupling system. The magnetically actuated needle plug eliminates the need for mechanical connections, reducing friction and wear while providing smoother operation. This substitution allows for more coupling options including weaker magnetic couplings that would be insufficient with mechanical linkages.
3Ease of operation
If the block and bleed valve is fixed, then the structure is simpler, but operational flexibility is reduced
Solution Approach 1:
The patent transforms the fixed block and bleed valve into an adjustable system. The needle plug can be positioned at different locations along the valve body, and the bleed port position can be adjusted externally. This dynamic capability allows operators to optimize performance for different operating conditions while maintaining relatively simple overall structure through modular design.
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 tapered needle plug reduces the force required for sealing, enhances reliability, and provides more coupling options, while the externally adjustable block and bleed valve improves operational flexibility.
Implementation Method 1
Some existing devices couple the float to the pneumatic valve using a magnet couple
Implementation Method 2
Large forces are required to seal such a pad or flap, requiring the use of a powerful magnet where magnet coupling is used
Data Source
AI summary
A float operated liquid level switch having a body, a float assembly, a switch magnet, and a needle plug. The float assembly may be pivotally attached to the body at a pivot axis. The float assembly may have a first end and a second end opposite the first end, where the pivot axis is located between the first end and the second end. The float assembly may further comprise a float attached to the first end and a float magnet attached to the second end, such that raising the float causes the float magnet to lower and lowering the float causes the float magnet to rise. The switch magnet may be responsive to movement of the float magnet, and the needle plug may be responsive to movement of the switch magnet.