Ball Valve Tapered Shaft Support for Crack-Free Top Entry Assembly
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Solution Overview
Problem
Existing ball valves face issues with the shaft section of the valve disc being hidden during insertion, leading to potential damage from contact with the shaft support hole or excessive load on slide rings, causing cracks or wear.
Innovation Solution
A valve design with a tapered section in the depression of the body guides the projection of the valve disc, ensuring proper axial support by aligning the tip end edge of the projection on the bottom side, preventing contact with the wall and minimizing load on the bearing section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the valve disc is inserted from the upper part of the body (top entry type), then the valve disc can be easily installed, but the shaft section cannot be observed during insertion and may contact the shaft support hole causing cracks
Solution Approach 1:
The tapered section is provided in advance in the shaft support hole to guide the shaft section during insertion. This preliminary structural arrangement ensures that the shaft section is properly aligned and supported before it reaches the support position, preventing contact with the shaft support hole wall and eliminating the risk of cracks while maintaining the top entry installation method
Solution Approach 2:
The tapered section acts as an intermediary element between the shaft support hole and the shaft section. It provides a gradual transition surface that guides the shaft section into proper alignment, preventing direct contact between the shaft section and the shaft support hole wall, thus avoiding damage while facilitating smooth insertion
2Reliability
If a slide ring made of synthetic resin is provided between the shaft section and shaft support hole, then the shaft section can be supported, but excessive load may be applied to the slide ring causing damage
Solution Approach 1:
The tapered section is provided in advance to guide the shaft section during insertion, ensuring proper alignment before the shaft section reaches the slide ring position. This prevents misalignment and concentration of load on the slide ring, allowing the slide ring to bear load uniformly and effectively
Solution Approach 2:
The tapered section serves as a guiding intermediary that ensures the shaft section is properly aligned with the shaft support hole before contacting the slide ring. This prevents excessive or uneven loading on the slide ring by ensuring smooth, aligned insertion, thereby protecting the slide ring from damage while maintaining its support function
Data Source
AI summary
A valve (10) of an embodiment of the present invention has a tapered section (55) on an opening side of a depression (51a) of a body (1). When a projection (4b) of a ball (4) is inserted into the depression (51a), a part of a tip end edge of the projection (4b) is brought into contact with the tapered section (55), and the tapered section (55) guides the projection (4b) so that the entire circumference of the tip end edge of the projection (4b) is located on a bottom side with respect to the tapered section (55).