Thermostatic Mixing Valve Ring Isolation for Lower-Cost Housing
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Solution Overview
Problem
The high cost of manufacturing thermostatic mixing fittings due to the need for a fitting housing made of materials suitable for drinking water, which requires avoiding contact between liquids and the housing.
Innovation Solution
A thermostatic mixing fitting design where the second liquid channel is partially surrounded by a ring that prevents contact with the housing, allowing the use of cost-effective materials like die-cast zinc for the housing, and a method involving a liquid guide and a deformable ring to ensure the second liquid does not come into contact with the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is made of material suitable for drinking water (e.g., brass), then the liquid contact safety is ensured, but the manufacturing cost increases significantly
Solution Approach 1:
The valve body is divided into functional zones: a first liquid channel made of inexpensive material (e.g., die-cast zinc) for cold water that does not require drinking water contact certification, and a second liquid channel made of expensive material (e.g., brass) for hot water that requires such certification. This segmentation allows cost reduction while maintaining safety where required.
Solution Approach 2:
Different materials with different properties are applied to different regions of the valve body based on local requirements. The region contacting drinking water (second liquid channel) uses high-quality brass material, while non-drinking water regions (first liquid channel) use cost-effective die-cast zinc material.
2Reliability
If the entire valve body is made of expensive drinking water-safe material, then the liquid contact safety is ensured, but the manufacturing cost increases
Solution Approach 1:
The valve body is segmented into multiple liquid channels with different material requirements. The first liquid channel (non-drinking water) and second liquid channel (drinking water) are structurally separated, allowing selective material application.
Solution Approach 2:
Material quality is optimized locally according to functional requirements. Only the portions of the valve body that actually contact drinking water are made from expensive certified materials, while other portions use economical alternatives.
3Ease of manufacture
If a complex multi-material construction is used to reduce costs, then the manufacturing cost decreases, but the device complexity increases
Solution Approach 1:
The valve body is segmented into distinct liquid channels that can be manufactured separately using different processes (e.g., die-casting for zinc parts, precision casting for brass parts) and then assembled, simplifying the manufacturing of each component while reducing overall complexity through modular construction.
Solution Approach 2:
Multiple liquid channels with different material requirements are combined into a single integrated valve body structure, eliminating the need for separate housings for each channel and reducing overall assembly complexity.
Data Source
Figure 1
Figure 2~4
AI summary
Thermostatic mixing valve (1), comprising at least: - a valve body (2) with a first inlet (3) for a first liquid and a second inlet (4) for a second liquid; - a thermostatic mixer (5) for mixing the first liquid and the second liquid to form a mixed water; - a first liquid channel (6) by means of which the first liquid can be conveyed from the first inlet (3) to the thermostatic mixer (5); and - a second liquid channel (7) by means of which the second liquid can be conveyed from the second inlet (4) to the thermostatic mixer (5), wherein the second liquid channel (7) is at least partially surrounded by a ring (8) that prevents contact between the second liquid and the valve body (2). Furthermore, a method for manufacturing such a thermostatic mixing valve (1) is also proposed.