Double Eccentric Valve Seal Layout for Lower Sliding Resistance
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Solution Overview
Problem
The double eccentric valve experiences increased sliding resistance and abrasion of the rubber seal part due to friction, leading to deterioration in sealing performance during valve opening and closing operations.
Innovation Solution
The valve design incorporates a reduced interference area between the valve seat and element by using a cutout portion, elliptical shape, or grooves, which minimizes contact and repulsion forces, and can include a rubber seal part with specific configurations to reduce sliding resistance while maintaining sealing effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber seal part is provided in the valve seat to enhance sealing property, then sealing strength between valve seat and valve element is improved, but sliding resistance increases due to frictional force of rubber seal part
Solution Approach 1:
The rubber seal part is provided only in specific regions (first region and second region) rather than uniformly across the entire valve seat. The first region has the rubber seal part extending in the radial direction, while the second region has it extending in the axial direction, creating different local sealing characteristics to balance sealing performance with reduced sliding resistance.
Solution Approach 2:
The valve seat is divided into multiple regions (first region and second region) with different rubber seal part configurations. This segmentation allows different portions of the valve seat to have optimized sealing characteristics, reducing overall sliding resistance while maintaining sealing effectiveness in critical areas.
2Reliability
If rubber seal part is provided to enhance sealing strength, then sealing property is improved, but eccentrical abrasion of rubber seal part occurs resulting in deterioration of durability
Solution Approach 1:
The rubber seal part is strategically positioned in specific regions rather than uniformly distributed, concentrating sealing functions in areas that require it while minimizing abrasion in other areas. This localized approach reduces overall wear on the rubber seal part.
Solution Approach 2:
Dividing the valve seat into regions with different rubber seal configurations allows critical sealing areas to have enhanced rubber presence while non-critical areas have reduced or no rubber, thereby reducing total abrasion and extending durability.
3Reliability
If interference between valve seat and valve element is increased to improve sealing, then sealing property is enhanced, but sliding resistance and wear increase
Solution Approach 1:
Interference is concentrated in specific regions (first region with radial extension and second region with axial extension) rather than uniformly distributed. This localized interference provides effective sealing at the sealing surface while minimizing overall sliding resistance during valve operation.
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 reduces sliding resistance and extends the durability of the rubber seal part, enhancing the sealing performance and reducing wear, thereby improving the overall operational efficiency of the valve.
Implementation Method 1
either the valve seat or the valve element is provided with a rubber seal part formed with either the seat surface or the seal surface
Data Source
AI summary
In a double eccentric valve, a valve seat or valve body includes a rubber seal part in which a seat surface or seal surface is formed. An interference between the valve seat and the valve body is made minimum at a position of a rotary-shaft-directional end of the valve body in the radial direction of the valve body which is parallel to an extending direction of the axis of a rotary shaft.