Flow Control Valve Seal Lip Turning-Up Suppression
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Solution Overview
Problem
Existing flow control valves face challenges in maintaining effective sealing due to the potential turning-up of seal lips under fluid pressure, which deteriorates sealing performance.
Innovation Solution
The flow control valve incorporates a seal member with a conical tubular seal lip and an annular rib-shaped protrusion to inhibit turning-up, ensuring the seal lip elastically contacts the valve member and seat, while the rib-shaped protrusion shuts off radial fluid pressure, thereby enhancing sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal lip is formed to allow easy elastic deformation to ensure sealing property, then the sealing performance is improved, but the seal lip may turn up due to fluid pressure acting in the opposite direction, deteriorating sealing performance
Solution Approach 1:
The seal member is designed with non-uniform cross-sectional area along its axial direction, creating different mechanical properties in different regions. The larger cross-sectional area at the base provides structural support and resistance to turning-up, while the smaller cross-sectional area at the seal lip tip maintains elasticity for effective sealing contact.
Solution Approach 2:
The seal member integrates two functional zones with different geometric characteristics into a single component - a robust base portion for structural stability and a flexible seal lip for sealing performance. This composite structure combines the benefits of both rigidity and elasticity within one element.
2Stability of the object's composition
If the seal lip is made rigid to prevent turning-up, then shape stability is improved, but sealing performance deteriorates due to reduced elastic deformation capability
Solution Approach 1:
The seal member is designed with non-uniform cross-sectional area along its axial direction, creating different mechanical properties in different regions. The larger cross-sectional area at the base provides structural support and resistance to turning-up, while the smaller cross-sectional area at the seal lip tip maintains elasticity for effective sealing contact.
Solution Approach 2:
The seal member integrates two functional zones with different geometric characteristics into a single component - a robust base portion for structural stability and a flexible seal lip for sealing performance. This composite structure combines the benefits of both rigidity and elasticity within one element.
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 configuration effectively suppresses seal lip turning-up, improving sealing performance and maintaining pressure control within the fuel tank, while also reducing the size of the valve and simplifying component integration and mounting.
Implementation Method 1
The seal member may be disposed between the corresponding valve member and the corresponding valve seat and may be configured to elastically seal therebetween when the corresponding valve member is in a closing position
Implementation Method 2
a conical tubular seal lip protruding obliquely inwards in an axial direction from the base portion and configured to elastically contact the other of the corresponding valve member and the corresponding valve seat
Data Source
AI summary
A flow control valve including a passage, and first and second valve devices disposed in the passage and comprising first and second valve members, valve seats, and seal members, respectively. Each valve member is movable for opening and closing the passage. Each seal member may seal between the corresponding valve member and seat. The first valve member moves in a first direction toward a closing position of the first valve device. The second valve member moves in a second direction, opposite the first closing direction, toward a closing position of the second valve device. The first or the second seal member may include a base portion attached to one of the corresponding valve member and the corresponding valve seat, a lip extending from the base portion, and a turning-up inhibiting device configured to inhibit the lip from turning up when the corresponding valve member is in the closing position.