Butterfly Valve Seat Ring Structure for Sealability and Easy Assembly
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Solution Overview
Problem
The existing butterfly valve seat rings face challenges in maintaining sealability and ease of assembly due to deformation and movement issues during valve operation, which affect the operation torque and sealing efficiency.
Innovation Solution
The butterfly valve seat ring features an arcuate projection on its outer peripheral surface, spaced apart from through-holes, allowing for easy assembly and preventing movement in the flow passage axis direction, while maintaining sealability through uniform compression and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bush is inserted into the through-hole to prevent fluid leakage, then sealability is improved, but the seat ring cannot be compressed and deformed in the valve stem direction, making assembly difficult
Solution Approach 1:
The invention removes the bush component that was previously inserted into the through-hole to prevent fluid leakage. Instead, it uses an arcuate projection on the outer peripheral surface of the seat ring that is spaced apart from the through-holes, eliminating the need for the bush while maintaining sealability and allowing the seat ring to be compressed during assembly.
Solution Approach 2:
The invention transitions from a radial arrangement (bush in through-hole) to a circumferential arrangement (arcuate projection on outer peripheral surface spaced from through-holes). This dimensional change allows the seat ring to be compressed in the valve stem direction during assembly while maintaining sealability through the arcuate projection's positioning.
2Reliability
If the seat ring is compressed to improve sealability, then sealing efficiency is improved, but the seat ring moves in the flow direction due to friction and fluid pressure, reducing sealability
Solution Approach 1:
The arcuate projection on the outer peripheral surface of the seat ring, spaced apart from the through-holes, provides preliminary resistance against movement in the flow direction. This projection maintains sealability through uniform compression while preventing the seat ring from moving due to friction and fluid pressure 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 design facilitates easier assembly and maintains sealability by preventing seat ring movement and deformation, reducing operation torque and enhancing sealing efficiency.
Implementation Method 1
an arcuate projection being formed on an outer peripheral surface of the seat ring... preventing movement in a flow passage axis direction
Implementation Method 2
maintaining sealability through uniform compression and pressure distribution
Data Source
Figure 1
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AI summary
A seat ring (15) for a butterfly valve (11) is mounted on an inner peripheral surface of an internal flow passage extending along the flow passage axis in a valve body (13) of the butterfly valve (11), so that an outer peripheral edge surface of a valve element (17) supported to be rotatable in the internal flow passage by a valve stem (19) supported by the valve body (13) abuts on the seat ring (15). The seat ring (15) includes a ring body (15a) having a cylindrical shape and extending in the center axis direction, and the ring body (15a) is formed at positions opposite to each other in a radial direction of the ring body (15a) with a pair of through-holes (15c, 15c) for allowing the valve stem (19) to pass through. On an outer peripheral surface of the ring body (15a), arcuate projections (23, 23) extending in a circumferential direction are formed apart from the pair of through-holes (15c, 15c).