Multi-piece Valve Stem Segmentation for Aerosol Dispensing
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Solution Overview
Problem
The assembly of valve stems in aerosol dispensers is hindered by the challenge of matching the size of the valve stem head with the hole through the valve seal, leading to issues such as inadequate sealing or ejection, particularly when the head is too large or too small.
Innovation Solution
The valve stem is designed with a decoupled configuration, comprising separate upper and lower stem portions and a disc, allowing for adjustable assembly through threaded connections or friction fits, enabling flexibility in manufacturing and accommodating various seal geometries, thus decoupling the diameter of the disc, head, and seal hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve stem head diameter is increased to improve sealing, then sealing reliability improves, but the risk of ejection increases and manufacturing complexity increases
Solution Approach 1:
The valve stem is divided into multiple segments: a lower stem portion, an upper stem portion, and a disc, which can be assembled in different configurations. This segmentation allows optimization of each component's dimensions independently, enabling reliable sealing without requiring a uniformly large head diameter that would increase ejection risk and manufacturing complexity.
2Reliability
If the valve stem head diameter is decreased to reduce ejection risk, then ejection risk reduces, but sealing reliability deteriorates
Solution Approach 1:
By segmenting the valve stem into separate components (lower stem portion, upper stem portion, disc), the design allows the sealing surface dimensions to be optimized for reliable sealing, while the overall head diameter can be reduced to minimize ejection risk. Each segment can be dimensioned independently based on its specific functional requirements.
3Ease of manufacture
If traditional molding operations are used for valve stem manufacturing, then manufacturing simplicity is maintained, but adaptability to different seal geometries is limited
Solution Approach 1:
The valve stem is designed as separable components (lower stem portion, upper stem portion, disc) that can be manufactured using conventional molding operations and then assembled. This segmentation enables adaptation to different seal geometries by selecting and configuring appropriate components, while still maintaining manufacturing simplicity through the use of standard molding techniques for each segment.
Solution Approach 2:
The modular valve stem design with interchangeable components creates a universal system that can accommodate various seal geometries and housing configurations. The same basic components can be configured differently to suit multiple applications, providing versatility without requiring entirely new manufacturing processes for each variant.
Data Source
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AI summary
A multi-piece valve stem (31). The multi-piece valve stem (31) allows for interchangeability of component parts, without requiring several stems to fit related valves (28), as are commonly used for aerosol dispensers (20). The multi-piece valve stem (31) also provides for assembly of valve stems (31) having a larger head (33), and thus more seal area, than can occur with a single piece valve stem, as is conventionally used. Smaller stem bore diameters are also possible with a multi-piece valve stem (31).