Insert Molded Evacuation Valve Seal
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Solution Overview
Problem
Existing metering devices for liquid lubricants face issues with inconsistent surface finishes and labor-intensive assembly processes due to the use of sheet stock materials for evacuation valves, leading to poor sealing and potential contamination.
Innovation Solution
The development of an insert molded evacuation valve with a seal holder and seal block, where the seal is molded within the carrier using a polished die to ensure a smooth, flat, and perpendicular sealing surface, preventing rotation and contamination, and utilizing a durable material for the holder and a pliable material for the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sheet stock material is used for the seal and adhesive bonding is employed, then the manufacturing process is simple, but the surface finish consistency is poor and sealing reliability deteriorates
Solution Approach 1:
The seal is integrated directly into the evacuation valve body through insert molding, merging two previously separate components (seal and valve body) into a single unified structure. This eliminates the adhesive bonding process and ensures consistent sealing surfaces without the variability associated with sheet material handling and manual assembly.
Solution Approach 2:
The mechanical adhesive bonding process is replaced with an insert molding process where the seal is molded directly into the valve body. This substitution eliminates the need for adhesives and manual bonding operations, providing superior and consistent sealing surfaces through direct integration.
2Quantity of substance
If sheet stock material is used for the seal, then material cost is low, but labor intensity increases and productivity decreases
Solution Approach 1:
The seal and valve body are combined into a single integrated component through insert molding, eliminating multiple assembly steps including cutting, cleaning, positioning, and adhesive bonding. This integration dramatically reduces labor intensity and increases production efficiency while maintaining material effectiveness.
Solution Approach 2:
The seal is pre-formed and integrated into the valve body during the molding process itself, rather than being attached later through separate assembly operations. This preliminary integration of the sealing component eliminates subsequent manual assembly steps and inspections, significantly improving productivity.
3Ease of manufacture
If adhesive bonding is used to attach the seal, then assembly is straightforward, but contamination risk increases and manufacturing precision deteriorates
Solution Approach 1:
The seal is merged with the valve body through insert molding, creating a permanent integral connection that eliminates adhesive bonding. This integration ensures precise seal positioning and orientation is built into the molding process itself, eliminating the positioning variability and contamination risks associated with adhesive application.
Data Source
AI summary
An evacuation valve for a metering device for a liquid medium is disclosed. The valve includes a seal holder having a chamber formed therein and a seal. An elastomeric material fills the chamber to form the seal. The seal includes a smooth, flat sealing surface located above the seal holder. The inclusion of a lip in the chamber retains the seal; a non-circular lip prevents rotation of the seal.