Resin Seal Ring Protrusion for Valve Sealing Under Flatness Loss
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Solution Overview
Problem
Resin seal rings in valve devices often experience deterioration in flatness due to sink marks or deformation during molding, leading to a decrease in surface pressure and compromised sealing properties when the valve is fully closed.
Innovation Solution
A resin seal ring design featuring a ring main body with a protrusion that extends in the circumferential direction and protrudes into an outer peripheral groove, ensuring contact with the groove side surfaces even when the ring main body's flatness is compromised, thus maintaining surface pressure and sealing effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin seal ring is used to cover the valve body, then gas leakage is suppressed and dimensional tolerances are alleviated, but the flatness deteriorates due to sink marks or deformation during molding
Solution Approach 1:
The seal ring is designed with a protrusion at a specific location (the sealing surface) that compensates for flatness deterioration. This local structural modification ensures that the critical sealing area maintains proper contact with the valve body even when other areas of the seal ring exhibit sink marks or deformation, thus preserving sealing reliability while accepting manufacturing imperfections.
2Adaptability or versatility
If the seal ring is made of resin, then dimensional tolerances are alleviated, but surface pressure decreases due to flatness deterioration
Solution Approach 1:
The protrusion creates a localized high-pressure zone at the sealing interface. By concentrating the sealing function at this protruding section, sufficient surface pressure is generated at the critical contact point with the valve body, compensating for the overall reduction in surface pressure caused by flatness deterioration across the entire seal ring surface.
Solution Approach 2:
The protrusion introduces a curved or raised geometric feature that concentrates force and pressure at the sealing contact point. This geometric modification ensures adequate surface pressure is applied to the valve body sealing surface, maintaining effective sealing despite the resin material's tendency to deform and reduce overall surface pressure distribution.
Data Source
AI summary
A seal ring is made of resin, applied to a valve body that changes an opening degree of a fluid passage through which a fluid passes, and that seals, when the valve body fully closes the fluid passage, between an inner peripheral surface defining the fluid passage and an outer peripheral edge of the valve body. The seal ring includes a ring main body fitted in an outer peripheral groove formed on the outer peripheral edge.