Butterfly Valve Seat Ring Geometry for Stable High-Pressure Sealing
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Solution Overview
Problem
Double eccentric butterfly valves face issues with wear and breakage of the valve seat portion due to increased surface pressure, which can lead to tilting and deformation when the spherical valve member seat surface contacts the valve seat portion, compromising sealing performance.
Innovation Solution
The butterfly valve features a valve seat portion with a triangular cross-section, where the bisector of the vertex angle is perpendicular to the tangential line at the point of contact, reducing deformation and wear by applying force perpendicularly, thus enhancing sealing performance and preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the projection amount of the valve seat portion into the internal flow passage is increased to increase surface pressure and improve sealing performance, then sealing performance is improved, but the valve seat portion becomes easy to tilt and wear occurs or breakage happens
Solution Approach 1:
The invention changes the geometric parameters of the valve seat portion by specifying a triangular cross-section with particular angle relationships. The vertex angle is set between 60-120 degrees, and the bisector is made perpendicular to the tangential line of the spherical valve seat surface at the contact point. This parameter optimization allows the valve seat portion to maintain high surface pressure for sealing while distributing contact forces to prevent tilting and wear.
2Reliability
If the valve seat portion is made to abut against the spherical valve member seat surface with increased pressure, then sealing performance is improved, but the valve seat portion tilts and becomes easy to wear
Solution Approach 1:
The invention changes the geometric parameters of the valve seat portion to a triangular cross-section with specifically controlled angles. The vertex angle is optimized to be between 60-120 degrees, and the orientation is precisely defined so that the bisector of the vertex angle is perpendicular to the tangential line of the spherical valve seat surface at the contact point. This geometric configuration ensures that the valve seat portion remains stable and resists tilting under pressure while achieving effective sealing.
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 reduces deformation and wear of the valve seat portion, increases surface pressure for improved sealing, and suppresses breakage, leading to enhanced sealing performance and reliability.
Implementation Method 1
the spherical valve member valve seat surface of the valve member is brought into pressure contact with the valve seat portion formed in an inner peripheral edge portion of the sheet member to define a sealing plane
Implementation Method 2
the valve seat portion having a convex curved surface... the valve seat portion is pushed by the spherical valve member valve seat surface to become easy to tilt
Data Source
AI summary
A butterfly valve includes a valve body with an internal flow passage extending in a direction of a flow passage axis, a disk-shaped valve member supported in the internal flow passage rotatably about a rotation axis perpendicular to the flow passage axis and having a spherical valve seat surface in an outer peripheral portion, an annular recessed portion surrounding the internal flow passage on the side surface of the valve body in a direction of the flow passage axis, and a seat ring attached to the annular recessed portion such that a valve seat portion provided in an inner peripheral edge portion thereof projects into the inner flow passage. The valve seat portion has a triangular cross section and is formed such that a bisector of a vertex angle in the triangular cross section of valve seat portion is perpendicular to a tangential line to the valve seat surface.