Butterfly Valve Contour Segmentation for Leakage Prevention
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Solution Overview
Problem
Conventional valve devices experience fluid leakage due to incomplete coverage of the valve shaft and improper positioning of contact surfaces, which hinder the rotation and closure of butterfly valves, especially in high-temperature fluid applications like engine exhaust systems.
Innovation Solution
A valve device configuration featuring a butterfly valve with first and second contour parts that form a smaller outer contour, secured to the valve shaft to close the passage at positions apart from the valve shaft hole, flanking a straight line parallel to the valve shaft, and utilizing seal parts and a relief part to ensure complete closure and prevent leakage, along with a biasing member to support the valve shaft for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact surfaces are disposed at positions overlapping with bearing holes of the valve shaft, then the butterfly valve can be brought into contact with the sheet parts during closure, but fluid leakage occurs in the region where sheet parts and covering part are not present
Solution Approach 1:
The invention transitions from a single sealing surface to a two-dimensional sealing system with multiple contour parts (first, second, third, and fourth contour parts) positioned at different locations around the valve shaft. This multi-dimensional arrangement ensures complete coverage of the valve shaft circumference, preventing fluid leakage while maintaining rotation and closure capabilities.
2Ease of operation
If the stepped surface is disposed at a position set apart from the bearing hole and the butterfly valve is secured at a position deviating from the rotation center, then the butterfly valve can rotate to closing position, but fluid leakage occurs in the region where the stepped surface is not present
Solution Approach 1:
The sealing system is segmented into multiple distinct contour parts (first, second, third, and fourth contour parts) that are positioned at different angular locations around the valve shaft. Each contour part provides sealing at a specific sector, and together they form complete circumferential coverage, eliminating leakage paths while preserving rotational movement.
Data Source
AI summary
This valve device includes a body having passages and valve shaft holes, a valve shaft passed through the valve shaft holes in a rotatable manner, and butterfly valves. The butterfly valves include first contour parts and second contour parts forming outer contour parts that are smaller than the first contour parts. The first and second contour parts are fixed to the valve shaft in order to close off the passages at positions set apart from the valve shaft holes toward the downstream side (upstream side) of the passages, and are disposed flanking a straight line parallel to the valve shaft to form prescribed outer contour parts. The body includes first seal parts with which the first contour parts are brought into contact and second seal parts with which the second contour parts are brought into contact within the passages. Fluid leakage in a closed state can thereby be reliably prevented.