Compact Shut-off Valve Abutment Stop Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional shut-off valves for water distribution systems face challenges in achieving a compact design without a neck, while maintaining an effective end-of-stroke stop for the shutter rotation, which is crucial for precise angular positioning and efficient water flow control.
Innovation Solution
A compact shut-off valve design featuring a one-piece valve body made of brass, with a spherical shutter and a pin passage, utilizing a groove and abutment stop mechanism for precise end-of-stroke positioning, eliminating the need for an external neck and enabling precise control of the shutter's angular positions through machining techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional shut-off valve design with an external neck and stop wall is used, then the end-of-stroke stop function is achieved, but the valve size increases and compactness is reduced
Solution Approach 1:
The invention merges the stop wall and pin structures directly into the valve body, eliminating the need for an external neck. The stop wall is formed as an integral part of the valve body, and the pin is positioned within the valve body's pin passage, combining multiple functions into a unified compact structure that maintains the end-of-stroke stop function while reducing overall valve size.
Solution Approach 2:
The invention repositions the pin from an external location on the neck to an internal location within the valve body, utilizing the internal space along the body axis. This dimensional reorganization allows the stop mechanism to function within the existing valve body envelope, eliminating the need for external protrusions and achieving compactness.
2Loss of substance
If the valve body is made compact without a neck, then material cost is reduced, but the end-of-stroke stop mechanism becomes more difficult to implement
Solution Approach 1:
The stop wall and pin positioning structures are merged into the valve body as integral features formed during the same manufacturing process. This eliminates the need for separate neck components and reduces the number of assembly steps, actually simplifying manufacturing while reducing material usage.
Solution Approach 2:
The valve body is designed to perform multiple functions: it provides the fluid passage, houses the shutter, contains the pin passage for positioning, and incorporates the stop wall for end-of-stroke limitation. This multi-functionality eliminates the need for separate dedicated stop mechanisms, reducing both material cost and manufacturing complexity.
3Measurement precision
If the shutter rotation range is precisely controlled, then angular positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The valve body's own structure provides the stop function through its integrated stop wall and pin passage. The pin, positioned within the valve body, automatically limits the shutter rotation range through the stop wall without requiring external control mechanisms. This self-containing design achieves precise angular positioning while minimizing device complexity.
Solution Approach 2:
The positioning and limiting functions are merged into the valve body's structural features. The pin passage and stop wall work together as an integrated system that automatically controls the shutter rotation range, eliminating the need for separate positioning mechanisms and reducing overall device complexity.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A valve body (2) of a shut-off valve (1) for water distribution systems is provided with a first conduit (4), a second conduit (8) and a shutter seat (6). The shutter seat (6) has an abutment stop (50) which realizes an end of stroke for the rotation of the shutter (20). The abutment stop forms a step with the bottom surface (6a) of the shutter seat (6).