Quintuple-Offset Butterfly Valve for Low-Wear Sealing
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Solution Overview
Problem
Existing butterfly valves, even with triple eccentric types, suffer from severe wear and friction between the disk and seat, leading to increased torque and potential water leakage due to non-uniform contact pressure and deformation.
Innovation Solution
A quintuple offset structure is implemented, where the disk is designed with specific offset distances and angles to reduce friction and contact area, allowing for a full circular shape that minimizes pressure concentration and enhances wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a central type butterfly valve is used, then the structure is simple and easy to manufacture, but abrasion due to friction between the disk and seat is severe and torque cannot be reduced
Solution Approach 1:
The patent applies asymmetry by implementing a quintuple offset structure where the disk center, seat center, and rotation shaft center are deliberately misaligned by specific offset distances (L1, L2, L3, L4, L5). This asymmetric configuration prevents direct contact between the disk and seat during operation, eliminating friction-induced wear while maintaining manufacturing feasibility through precise dimensional specifications.
2Area of stationary object
If the disk is manufactured in an elliptical shape to increase contact area, then contact area increases but pressure concentration increases causing deformation and water leakage
Solution Approach 1:
The patent explicitly specifies that the disk shall be manufactured as a full circle shape with the outer peripheral surface forming a precise arc, rather than an elliptical shape. This circular geometry, when combined with the quintuple offset structure, distributes contact pressure uniformly across the sealing surface, preventing pressure concentration that would cause deformation and leakage.
Data Source
AI summary
A butterfly valve having a quintuple offset structure includes a valve body having a flow path formed therein and provided to connect neighboring pipes; a seat coupled to an inner surface of the valve body; and a disk including a disc body provided to open or close the flow path. A hinge coupling part is formed on one surface of the disk body and coupled with a rotation shaft which hinge-couples the disk body and the valve body so that the disk body is rotatable to the valve body.