Fluid Control Valve Inward Lip Sealing Design
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Solution Overview
Problem
Existing fluid control valves face issues with secure sealing when pressure is applied to either chamber, leading to stress concentration and suction of the sealing surface, which can result in unstable valve operation and potential damage.
Innovation Solution
The fluid control valve design features a lip portion that protrudes inwardly from the rim of the valve body towards its center, reducing the circumference of the sealing area and preventing suction, allowing for secure sealing with reduced operational force and minimizing the risk of deformation or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a V-shaped lip portion protrudes outwardly from the rim portion to seal the valve, then sealing performance is improved, but the lip portion is sucked to the sealing surface due to vacuum pressure, causing unstable valve operation
Solution Approach 1:
The lip portion is inverted to protrude inwardly from the rim portion toward the center of the valve body, rather than outwardly. This reversal prevents the formation of vacuum pressure that causes suction, eliminating the instability issue while maintaining sealing effectiveness through the inwardly directed lip geometry
2Reliability
If the V-shaped lip portion is pressed against the sealing surface by pressure from either side, then sealing is achieved, but stress concentrates on the fork portion, risking breakage
Solution Approach 1:
The sealing structure is modified locally by directing the lip portion inwardly, creating a sealing configuration that distributes pressure away from the vulnerable fork portion. The inwardly protruding lip creates a sealing path that reduces stress concentration on the fork portion while maintaining effective sealing against the sealing surface
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances sealing performance by distributing pressure effectively, preventing fluid leakage and allowing smooth operation with reduced torque requirements, while maintaining the lip portion's integrity.
Implementation Method 1
In a state where a pressure is generated in a first surge space 107a, a tip end of the outwardly directed lip portion 119s structuring the V-shaped cross section is pushed to the sealing surface 113 to seal the valve body and the sealing surface 113
Data Source
AI summary
A fluid control valve which includes a body (12) forming a fluid passage (6P) and including a sealing surface (13a, 13b) positioned in the fluid passage (6P), a valve body (14) configured to rotate between an open position and closed position within the fluid passage (6P), an elastic sealing member (17) provided at a rim portion of the valve body (14), and a lip portion (19) extended from the elastic sealing member (17) to be directed towards a center portion of the valve body (14). The lip portion (19) contacts the sealing surface (13a, 13b) and a surface of the lip portion (19) facing the sealing surface (13a, 13b) is exposed to the fluid passage (6P).