Dielectric Fitting with Segmented Flange to Reduce Bulk and Cost
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dielectric fittings used to connect dissimilar metals in plumbing systems are often bulky and costly due to the need for a large flange to accommodate an O-ring, and they may not provide sufficient protection against galvanic corrosion, which can lead to installation errors and non-compliance with building codes.
Innovation Solution
A compact dielectric fitting design where the bulge of the second fitting does not pass through a hole in the nut, allowing for separate components with a smaller flange and dielectric gaskets to provide electrical isolation and sealing, reducing bulk and cost while maintaining effective corrosion prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large flange is used to accommodate the O-ring in existing dielectric fittings, then the O-ring can be properly positioned and sealed, but the fitting becomes bulky and increases in size
Solution Approach 1:
The invention divides the fitting into separate components: the bulge with O-ring groove is integrated into the second fitting (street elbow), while the first fitting (street tee) has a smaller flange. This segmentation allows each component to be optimized independently, eliminating the need for an oversized flange to accommodate the O-ring while maintaining sealing capability.
2Reliability
If a large flange is used to accommodate the O-ring, then proper sealing is achieved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the fitting into two separate components with the O-ring groove integrated into the second fitting, the first fitting can be manufactured with a smaller, less expensive flange. This reduces material usage and manufacturing complexity while maintaining the sealing function through the integrated groove design.
3Ease of operation
If dissimilar metals are directly connected to form a fluid flow path, then installation is simple, but galvanic corrosion occurs
Solution Approach 1:
The invention uses dielectric gaskets as intermediary materials positioned between dissimilar metals (e.g., copper and iron-based metals). These gaskets provide electrical isolation preventing galvanic corrosion while allowing the fittings to be installed using standard threading and assembly procedures, maintaining installation simplicity.
4Reliability
If dielectric gaskets are used to isolate dissimilar metals, then galvanic corrosion is prevented, but the device complexity increases
Solution Approach 1:
The invention merges the dielectric gasket function with the structural components of the fitting. The gaskets are positioned within the assembly where they work together with the flanges and threaded connections, integrating the corrosion prevention function into the existing fitting structure rather than adding separate isolation components.
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 design results in a smaller, more cost-effective dielectric fitting that effectively prevents galvanic corrosion and allows for easier assembly and potential repair, while maintaining electrical isolation and sealing capabilities.
Implementation Method 1
dielectric gaskets are positioned to either side of the flange of the copper portion... the iron-based metal components compress against the dielectric gaskets and the iron-based metal components do not contact the copper flange or the copper portion
Implementation Method 2
the copper portion of the dielectric fitting includes an O-ring that is positioned to engage against an outer surface of the copper piping from the plumbing system
Implementation Method 3
the iron-based metal components are screwed together to capture the flange of the copper portion, the iron-based metal components compress against the dielectric gaskets
Data Source
AI summary
A dielectric fitting includes a nut having inner threads and an axial compression surface, and a hole having a first diameter. A mating component includes outer threads that engage with the inner threads including a second axial compression surface. A first fitting includes a circumferential flange captured between the first axial compression surface and the second axial compression surface, the first fitting having a first wall that extends axially and passes through the first hole and includes first fitting threads. A second fitting includes second fitting threads that engage with the first fitting threads, the second fitting having a second wall and a bulge portion that radially projects to a second diameter and includes an O-ring. The nut and the mating component are dielectrically isolated from the first fitting and the second fitting, and the second diameter is larger than the first diameter.