Umbrella Check Valve Geometry to Prevent Grit-Induced Backflow
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Solution Overview
Problem
Existing IV check valves are susceptible to grit and particulate lodging, leading to leaks and backflows due to incomplete sealing of inlet ports during reverse flow, which renders them ineffective.
Innovation Solution
The design incorporates an umbrella-shaped valve within a valve chamber with a dome-shaped ceiling and a curved floor, where the valve head deflects to create a gap between the ceiling and the valve surface, preventing grit and particulates from lodging and ensuring secure sealing by conforming to the shape of the ceiling when downstream pressure is applied, thus preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional check valve designs are used, then the structure is simple and manufacturing is easy, but grit and particulates lodge in the valve causing leaks and backflows
Solution Approach 1:
The patent applies curvature by designing the valve chamber with a dome-shaped ceiling and a curved floor that slopes upward toward the inlet port. This curved geometry prevents grit and particulates from lodging in the valve mechanism, as particles naturally roll down the curved floor toward the outlet port rather than becoming trapped. The umbrella-shaped valve head also utilizes curvature in its design to maintain proper sealing contact with the curved ceiling surface, thereby preventing leaks and backflows while managing the complexity through elegant geometric design.
2Reliability
If the valve head seals tightly against the ceiling, then backflow is prevented, but grit lodging prevents complete sealing
Solution Approach 1:
The patent extracts or removes the harmful factor of grit lodging by designing the curved floor that actively directs particulates away from the sealing interface. The curvature creates a self-cleaning effect where grit is continuously moved toward the outlet port and prevented from accumulating at the valve head-ceiling contact point. This extraction of the harmful element allows the valve head to maintain tight sealing contact with the ceiling without interference from lodged particulates, ensuring reliable prevention of backflow.
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 effectively prevents backflow and ensures reliable fluid delivery by securely sealing the inlet port even when grit or particulates are present, enhancing the reliability and reducing the likelihood of leaks in IV check valves.
Implementation Method 1
When an upstream pressure is applied to the valve, the valve head is configured to deflect away from the ceiling of the valve chamber and unseal the inlet port
Implementation Method 2
When a downstream pressure is applied to the valve, the valve head is configured to deflect away from the floor of the valve chamber and seal the inlet port such that the valve head conforms to a shape of the ceiling of the valve chamber
Data Source
AI summary
A check valve includes a housing that includes an inlet port, an outlet port, and a valve chamber. The inlet port extends from a ceiling of the valve chamber to an outer surface of the housing. The outlet port extends from a floor of the valve chamber to the outer surface of the housing. The check valve further includes a valve member supported within the chamber. The valve includes a valve head. When an upstream pressure is applied to the valve, the valve head is configured to deflect away from the ceiling of the valve chamber and unseal the inlet port. When a downstream pressure is applied to the valve, the valve head is configured to deflect away from the floor of the valve chamber and seal the inlet port such that the valve head conforms to a shape of the ceiling of the valve chamber.