Finned Check Valve Plunger for Low Pressure Drop Medical Gas Flow
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Solution Overview
Problem
Current check valve designs in medical gas networks create a large pressure drop, making it difficult to meet the minimum flow rate required by codes such as NFPA99, especially in modular systems with rotational joints and connecting arms, which affects gas flow and pressure metrics.
Innovation Solution
The check valve features a movable plunger with a finned frustoconical inlet and outlet end, reducing turbulence and improving flow performance by directing gas flow against these elements, thereby enhancing aerodynamics and flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional check valve is used in modular medical gas systems, then the check valve provides basic flow control and prevents backflow, but it creates a large pressure drop that makes it difficult to meet the minimum flow rate required by NFPA99 codes
Solution Approach 1:
The plunger is designed with a frustoconical shape featuring curved surfaces that guide gas flow smoothly through the valve. The frustoconical geometry with optimized angles reduces flow separation and turbulence, thereby minimizing pressure drop while maintaining reliable backflow prevention functionality
Solution Approach 2:
The invention optimizes geometric parameters of the plunger including the frustoconical angle, fin dimensions, and surface curvature to balance flow performance with sealing effectiveness. By adjusting these parameters, the valve achieves low pressure drop characteristics while ensuring adequate backflow prevention
2Ease of manufacture
If a conventional check valve design is used, then the structure is simple and easy to manufacture, but the internal flow path creates turbulence at higher medical gas pressures
Solution Approach 1:
The frustoconical plunger with curved surfaces and optimized angles guides gas flow smoothly, reducing flow separation and turbulence. The aerodynamic shaping minimizes chaotic flow patterns while remaining compatible with standard manufacturing processes
Solution Approach 2:
The plunger incorporates fins that segment the gas flow into controlled streams. These fins are strategically positioned to manage turbulence without requiring complex manufacturing, as they can be formed through standard machining or molding processes
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 achieves a higher flow rate at a given pressure drop compared to conventional check valves, allowing hoses to be removed or replaced without gas loss or system shutdown, while ensuring compliance with NFPA99 codes.
Implementation Method 1
The plunger comprises a finned frustoconical inlet end having one or more fins (which may be referred to herein as 'inlet fins') and a finned frustoconical tip at its outlet end having one or more fins (which may be referred to herein as 'outlet fins') in order to reduce inlet and outlet turbulence at higher medical gas pressures by reducing the gas flow turbulence within the flow channel.
Data Source
AI summary
A check valve for high flow medical gas applications is disclosed. The check valve includes a valve body that defines a flow channel through the valve body from an inlet to an outlet. A movable plunger is in the flow channel of the valve body, with the plunger being constrained in the flow channel between the inlet and the outlet. The plunger comprises a finned frustoconical inlet end a finned frustoconical tip at its outlet which act as flow directing elements which reduce inlet and outlet turbulence at higher medical gas pressures by reducing the gas flow turbulence within the flow channel.