Valve Housing Flow Deflection to Protect Soft Seals
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Solution Overview
Problem
Existing fluid flow control devices face challenges in achieving effective shut-off and durability due to direct fluid impingement on seals, especially when abrasive particles are present, leading to wear and reduced reliability.
Innovation Solution
A fluid flow control device with a soft seal positioned downstream of a convex curved surface on the housing, which deflects the fluid flow away from the seal, reducing wear and allowing the seal to be exposed directly for improved sealing performance without additional protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the soft seal is positioned in the direct fluid flow path to ensure effective sealing contact with the valve member, then sealing performance is improved, but the seal experiences direct fluid impingement and abrasive particle wear, reducing durability
Solution Approach 1:
The convex curved surface acts as an intermediary element between the fluid flow and the soft seal. It deflects the fluid flow away from the seal, preventing direct impingement while allowing the seal to maintain its positioning for effective sealing contact with the valve member during shut-off.
Solution Approach 2:
The housing internal surface is segmented into distinct functional zones: a convex curved surface for flow deflection, a seal protection zone where the soft seal is positioned downstream of the flow path, and a sealing contact zone where the valve member contacts the seal. This segmentation allows each zone to perform its specific function optimally.
2Duration of action of stationary object
If additional protective structures are added to shield the seal from fluid flow, then seal durability is improved, but device complexity increases
Solution Approach 1:
The flow deflection function and seal protection function are merged into a single integrated convex curved surface structure on the housing. This eliminates the need for separate protective components while achieving both flow diversion and seal protection, thereby maintaining device simplicity.
Solution Approach 2:
The convex curved surface performs multiple functions simultaneously: it deflects fluid flow away from the seal, protects the seal from abrasive particle impingement, and maintains the pressure differential needed for effective sealing. This multi-functionality reduces the need for additional components.
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
The solution enhances the reliability and durability of the fluid flow control device by shielding the soft seal from direct fluid impact, reducing wear and enabling the use of seals based on sealing properties rather than durability, thus improving shut-off performance.
Implementation Method 1
the convex curved surface is shaped to separate the flow of fluid through the valve aperture away from the surface of the housing such that the fluid does not impinge directly on the soft seal
Data Source
AI summary
A device for controlling the flow of a fluid through a conduit from an upstream side of the device to a downstream side of the device. The device includes a housing defining a valve aperture and a mounting member arranged on the downstream side of the valve aperture. A valve member is movably mounted on the mounting member and is arranged to selectively open and close the valve aperture to control the flow of fluid. A soft seal is arranged on the housing for substantially sealing the valve aperture when the valve member contacts the housing. The soft seal is located downstream of a convex curved surface of the housing which is shaped to separate the flow of fluid through the valve aperture away from the surface of the housing such that the fluid does not impinge directly on the soft seal.