Plastic Valve Body with Cast Metal Threaded Insert
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Solution Overview
Problem
Existing shut-off elements for pipelines face challenges in achieving robust and durable connections between the base body and threaded inserts while maintaining cost-effectiveness, as detachable coupling arrangements are not durable and producing the entire element from metal or ceramic is costly.
Innovation Solution
The threaded insert is positively connected and cast into the base body, allowing for cost-effective production, with a saddle and stabilizing elements to secure the insert, and the base body can be made from temperature-resistant plastic, eliminating the need for additional coupling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the threaded insert is detachably coupled to the base body, then assembly is simplified, but the connection durability and robustness deteriorate
Solution Approach 1:
The patent merges the threaded insert and base body into a single integrated component. The threaded insert is embedded directly into the base body during the injection molding process, eliminating the need for separate coupling elements. This integration ensures that the threaded insert and base body move as one unit, preventing twisting or loosening while maintaining assembly simplicity through the molding process itself.
Solution Approach 2:
The patent uses composite construction by combining a plastic base body (made through injection molding) with a threaded insert (made of metal or ceramic). This composite approach allows each material to contribute its optimal properties: the plastic provides cost-effective molding and sealing capabilities, while the metal or ceramic insert provides the necessary thread strength and durability for reliable valve stem engagement.
2Strength
If the entire shut-off element is made from metal or ceramic, then the thread strength and durability are improved, but the manufacturing cost increases
Solution Approach 1:
The patent applies local quality by using different materials for different parts of the shut-off element based on their specific functional requirements. The base body is made from plastic because it requires sealing capabilities and cost-effective mass production through injection molding. The threaded insert is made from metal or ceramic only where thread engagement strength is critical. This localized material selection optimizes both cost and performance.
Solution Approach 2:
The patent employs composite materials by combining plastic for the base body with metal or ceramic for the threaded insert. This allows the majority of the component (the base body) to be manufactured cost-effectively through injection molding, while only the critical threading portion uses expensive but high-strength materials. The injection molding process integrates the insert into the plastic matrix, creating a durable yet cost-efficient hybrid component.
3Stability of the object's composition
If additional coupling elements are used to secure the threaded insert, then the connection stability is improved, but the device complexity and assembly time increase
Solution Approach 1:
The patent eliminates additional coupling elements by merging the threaded insert and base body into a single integrated component. The threaded insert is embedded directly into the base body during injection molding, creating a monolithic structure where the insert and base body function as one unit. This eliminates the need for separate flanges, screws, or other coupling elements, reducing component count while maintaining connection stability.
Solution Approach 2:
The injection molding process itself serves the dual function of creating the base body and securing the threaded insert simultaneously. The molding process embeds the insert into the plastic matrix, creating inherent mechanical interlocking and stabilization. This self-service approach to securing the insert eliminates the need for additional fastening operations or coupling elements, simplifying both the device structure and assembly process.
Data Source
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AI summary
The element (1) has an opening (6) holding a slider spindle (7) that stands in contact with a thread-insert (8). A base body (5) is connected with the thread-insert in a form-fit manner. The thread-spindle is molded in the base body, which has a saddle (17) that stabilizes a position of the thread-insert, where the saddle is in form of a shell. The insert is made of metal or ceramic material, and the base body is made of plastic. A supporting plate (14) is made of metallic material, and sealing elements (4) are made of plastic and/or elastomer.