Electric Valve Multi-Sealing Structure for High-Pressure Stem Leakage
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Solution Overview
Problem
Existing electric valves experience fluid leakage along the axial direction of the valve stem, particularly with high-pressure fluids, which is a technical challenge that needs to be addressed.
Innovation Solution
The electric valve incorporates multiple sealing members and a sealing medium between these members to form a sealing chamber, including a first and second sealing groove with respective sealing members, and a plunger with additional sealing grooves, to prevent fluid leakage along the valve stem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single sealing structure is used, then device complexity is low, but sealing performance deteriorates under high pressure causing fluid leakage
Solution Approach 1:
The sealing structure is divided into multiple independent sealing members (first sealing member, second sealing member, third sealing member) arranged in series along the axial direction. Each sealing member provides a separate sealing interface between the valve stem and valve body, creating multiple barrier layers that collectively prevent fluid leakage under high pressure conditions where single sealing would fail.
Solution Approach 2:
The sealing members are nested within the valve assembly structure, with each sealing member positioned in a dedicated sealing chamber formed by the valve body and valve stem. The sealing members are arranged concentrically around the valve stem, creating a nested configuration where multiple sealing elements occupy progressively smaller radial spaces while maintaining axial separation.
2Reliability
If multiple sealing members are added to prevent leakage, then sealing performance improves, but friction loss increases
Solution Approach 1:
Different sealing members are made from different materials with distinct friction characteristics. The first sealing member uses a material optimized for its specific sealing location and pressure conditions, the second sealing member uses a different material suited for its operating conditions, and the third sealing member (packing) uses a material specifically selected for low friction and self-lubricating properties. This local differentiation of material properties allows each sealing interface to minimize friction while maintaining adequate sealing performance.
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
The multi-sealing mechanism effectively prevents fluid leakage, enhances sealing performance, reduces friction loss, and prolongs the service life of the sealing members by providing a stable oil film and lubrication, thereby improving the operational reliability of the valve.
Implementation Method 1
part of the sealing medium is located between the first sealing member and the second sealing member... providing a stable oil film and lubrication
Implementation Method 2
the plunger is sealed to the valve stem
Implementation Method 3
the first sealing member is pressed between the valve stem and the first sealing groove
Implementation Method 4
the second sealing member is pressed between the valve stem and the second sealing groove
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An electric valve (100) and an assembly method therefor. The provision of multilayered sealing of a first sealing element (5), a second sealing element (6), and a sealing medium located between the first sealing element (5) and the second sealing element (6) along the axial direction of a valve stem (4) is conducive to restricting outward leakage of a fluid along the axial direction of the valve stem (4).