Valve Plug Stepped Channels for Polyurethane Bonding Strength
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Solution Overview
Problem
Current cast polyurethane sealing disks in fluid control devices often lack sufficient bonding strength at high pressure drops and low flows, leading to bonding failure and compromised performance, and mechanical methods to secure them are complex and costly.
Innovation Solution
A valve plug design featuring a cylindrical body with an annular flange and multiple holes that create channels with stepped portions, allowing for a continuous and horizontal bond with a sealing member, providing increased strength and durability for severe applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cast polyurethane sealing disks are used, then sealing function is provided, but bonding strength is insufficient at high pressure drops and low flows
Solution Approach 1:
The valve plug is segmented into multiple functional zones: an annular flange for bonding, a body for fluid flow, and integrated channels with stepped portions that create bonding surfaces. This segmentation allows the sealing member to form continuous and horizontal bonds across different regions, significantly enhancing bonding strength under high pressure drops and low flows without requiring complex external mechanical fastening systems.
Solution Approach 2:
The sealing member is nested within the valve plug structure, with the sealing member positioned inside the valve plug body and secured through the integrated channels and stepped portions. This nesting arrangement allows the sealing member to be firmly retained within the valve plug, providing reliable bonding strength while maintaining a compact and simple overall structure.
2Reliability
If mechanical methods are used to secure the sealing disk, then bonding strength is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The valve plug design merges the bonding function directly into the valve plug structure itself through the annular flange and integrated channels with stepped portions. The sealing member is bonded to the valve plug body through these integrated features, eliminating the need for separate mechanical fastening components. This merging of functions simplifies manufacturing while ensuring reliable bonding strength under severe operating conditions.
3Ease of manufacture
If simple bonding is used, then manufacturing is easier, but bonding strength is insufficient under severe conditions
Solution Approach 1:
The valve plug incorporates local quality variations through the annular flange with specific bonding surfaces and the channels with stepped portions. These localized structural features create optimal bonding zones that enhance bonding strength precisely where needed under severe conditions, while the rest of the valve plug maintains a simple geometry that is easy to manufacture. The local quality enhancements are achieved through standard machining operations rather than complex processes.
Data Source
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AI summary
A valve plug comprising a cylindrical body having an annular flange with a top surface, a bottom surface, and a circumference is disclosed. The valve plug further comprises an annular recess disposed in the bottom surface of the flange, and a plurality of holes disposed in the top surface of the flange. Each hole extends into the recess to create a plurality of channels extending between the bottom and top surfaces of the flange. Each channel of the plurality of channels includes a stepped portion. A polyurethane sealing member is disposed within each channel and includes: a top portion forming a continuous bond on the top surface and along the circumference of the flange; a central portion forming a horizontal bond on each stepped portion; and a bottom portion forming a sealing surface adapted to sealingly engage a seating surface of the seat.