High-Copper Alloy Valve with Welded Press Connection
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Solution Overview
Problem
Current drinking water components, particularly those made from non-ferrous metal alloys with high copper content, face challenges in corrosion resistance, machinability, and compliance with strict heavy metal ion limits, leading to high production costs and potential health risks due to the release of harmful substances like lead and nickel.
Innovation Solution
A copper alloy with a Cu content of over 80% by weight, combined with Si and Zn, which allows for welding and is suitable for prefabrication and efficient assembly, offering improved corrosion resistance, machinability, and reduced heavy metal ion release, enabling cost-effective and durable building fittings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If lead-free copper alloys with up to 79% copper content are used, then heavy metal ion release is reduced, but corrosion resistance becomes insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the copper alloy by increasing copper content to 80-98% by weight and precisely controlling silicon (2-5%) and zinc (3-18%) content, which simultaneously improves corrosion resistance and maintains low heavy metal ion release
Solution Approach 2:
The patent creates a composite copper alloy material combining copper with silicon and zinc in specific proportions, where silicon provides corrosion resistance and zinc improves machinability, achieving a balance between durability and processability while meeting drinking water safety requirements
2Ease of manufacture
If traditional gunmetal alloys with lead and nickel are used, then machinability is improved, but harmful lead and nickel are released into drinking water
Solution Approach 1:
The patent extracts and removes harmful lead and nickel from the alloy composition entirely, replacing them with safe alternatives (silicon and zinc) that provide similar or superior functional properties without contaminating drinking water
Solution Approach 2:
The patent uses readily available and cost-effective copper, silicon, and zinc materials instead of expensive special alloys, achieving economical production of drinking water safe components with good machinability
3Adaptability or versatility
If copper alloys with less than 80% copper content are used, then alloying elements can be added to improve properties, but welding becomes difficult or impossible
Solution Approach 1:
The patent changes the base metal composition by using high copper content (80-98%) as the foundation, which inherently provides good weldability, while adding controlled amounts of silicon and zinc to achieve the desired balance of corrosion resistance, machinability, and welding performance
4Device complexity
If complex casting and machining processes are used for lead-free alloys, then component complexity is reduced, but production costs increase significantly
Solution Approach 1:
The patent segments the manufacturing process into two independent stages: casting the fitting housing and casting the press connection separately, allowing each component to be optimized for its specific requirements and assembled through simple welding, thereby reducing overall production complexity and cost
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 high-tightness, long-lasting welded connections that meet stringent drinking water standards with minimal release of harmful substances, reducing production costs and ensuring compliance with regulatory limits.
Implementation Method 1
the corrosion resistance of this alloy is only insufficient
Implementation Method 2
the fitting housing and the press connections can be prefabricated separately and independently of one another and only then connected in a cohesive manner by welding
Data Source
Figure 1~2
Figure 3~4
AI summary
Building fitting comprises a press connection (20, 200) welded to a housing (1) in a fluid-tight manner. An independent claim is also included for a method for the production of the building fitting.