Shut-off Element Wear-Resistant Insert Corrosion Protection
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Solution Overview
Problem
Existing shut-off elements with rubber coatings on cast iron base bodies suffer from corrosion damage due to the relative movement of the threaded nut, leading to potential damage and corrosion, especially under load conditions.
Innovation Solution
A shut-off element with a wear-resistant insert made of materials like glass-fiber-reinforced polyamide is embedded between the base body and the threaded nut, preventing direct contact and reducing friction-induced damage, while a surrounding elastomer casing protects against corrosion, and guide projections with wear-resistant plastics further enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threaded nut moves relative to the base body under load, then the shut-off element can function properly, but the sheathing can be damaged leading to corrosion
Solution Approach 1:
A wear-resistant insert is introduced as an intermediary element between the threaded nut and the elastomer sheathing. This insert absorbs the mechanical stress and friction from the moving threaded nut, preventing direct contact with the sheathing and thereby eliminating the harmful factor of corrosion damage while maintaining the functional movement of the threaded nut.
Solution Approach 2:
The wear-resistant insert is pre-installed in the receptacle of the base body before the threaded nut is assembled. This beforehand cushioning measure ensures that the sheathing is protected from potential damage before the threaded nut begins its moving operation under load, preventing corrosion from occurring in the first place.
2Stability of the object's composition
If the sheathing is made thin to allow flexibility, then the base body can be more flexible, but the sheathing is more susceptible to damage from the threaded insert
Solution Approach 1:
The wear-resistant insert serves as a protective intermediary that allows the sheathing to remain thin and flexible while preventing it from bearing the mechanical load and friction. The insert takes over the load-bearing function, enabling the sheathing to maintain its flexibility without sacrificing damage resistance.
3Ease of operation
If the threaded nut is allowed to move under load, then the shut-off function can be achieved, but friction and stress can damage the sheathing
Solution Approach 1:
The wear-resistant insert acts as a mediator that enables the threaded nut to move freely for shut-off operation while absorbing the friction and stress generated during this movement. This prevents the friction-induced damage that would otherwise occur between the threaded nut and the elastomer sheathing.
Solution Approach 2:
The wear-resistant insert is designed as a sacrificial component that can withstand friction and wear over time. While the insert may eventually wear out, it protects the more valuable base body and sheathing from damage, making it economically advantageous to replace the insert rather than the entire shut-off element.
Data Source
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AI summary
The invention relates to a shut-off element (1) for a shut-off valve comprising a base body (2), a casing (7) surrounding the base body (2), and a threaded nut (5) arranged in a receptacle (4) of the base body (2). To achieve improved protection against corrosion damage, an insert (9) made of a wear-resistant material is arranged between the base body (2) and the threaded nut (5), embedded in the casing (7).