Butterfly Valve Seat Cover Deformation Gap
Solution Overview
Problem
Butterfly valve assemblies face issues with seat deformation and leakages due to cycling between open and closed positions, leading to potential fluid flow obstruction and reduced sealing efficiency.
Innovation Solution
The valve assembly design includes a valve body with an inward and outward ridge system and a seat assembly comprising a seat and seat cover with a radial alignment rib, which is positioned within a groove to create a deformation gap, minimizing movement and enhancing sealing by eliminating additional elements that could cause leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve cycles between open and closed positions, then the valve can control fluid flow, but the seat deforms from its original shape causing leakage
Solution Approach 1:
The seat assembly is segmented into multiple components: the seat body, seat cover, and alignment rib. This segmentation allows each component to perform its specific function - the alignment rib maintains positioning while the seat cover provides sealing, resolving the contradiction between flow control and sealing reliability.
Solution Approach 2:
The alignment rib is pre-positioned within the groove during assembly, establishing the correct radial and axial position of the seat before operation begins. This preliminary positioning prevents deformation during cycling, maintaining sealing efficiency while enabling flow control.
2Reliability
If additional elements are added to the seat assembly to prevent deformation, then sealing efficiency improves, but the number of potential leak lines increases
Solution Approach 1:
The alignment rib is integrated directly into the seat assembly structure rather than being a separate component. This merging reduces the number of discrete elements and potential leak lines while still providing the necessary positioning function to prevent seat deformation and maintain sealing efficiency.
Solution Approach 2:
The alignment rib serves multiple functions simultaneously: it provides radial alignment, prevents axial movement, and maintains the seat's original shape during cycling. This multi-functionality eliminates the need for additional separate elements, reducing device complexity while improving sealing reliability.
Data Source
AI summary
A valve assembly can include a valve body, a seat, and a seat cover. In one aspect, the valve body can include an inner surface and an outer surface. The inner surface can define a body bore and a valve body groove having a bottom groove surface. The seat can include an inner surface defining a seat bore and an outer surface defining a seat alignment rib configured to be positioned in the valve body groove. In one aspect, the valve body groove can define a deformation gap between the bottom groove surface and an outer surface of the seat alignment rib. The seat cover can include an inner surface defining a seat cover bore. In one aspect, the seat cover can be mounted on the seat with an outer surface of the seat cover facing the inner surface of the seat.