Combination Air Release Valve Layout for Contaminated Fluids
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Solution Overview
Problem
Conventional air release valves made of plastic materials are unsuitable for applications involving contaminated fluids, as they are prone to contamination and corrosion, compromising their integrity and functionality.
Innovation Solution
A combination air release valve design featuring a stainless steel bottom float and increased standoff distance between internal components and contaminated fluid, along with concentrically arranged flow restrictors and seals, to enhance corrosion resistance and prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plastic materials are used for the float and flow restrictors to reduce weight and operating force, then the valve is easier to operate, but the materials are prone to contamination and corrosion when exposed to contaminated fluids
Solution Approach 1:
A stainless steel screen is introduced as an intermediary component between the contaminated fluid and the plastic float/flow restrictors. The screen acts as a protective barrier that allows fluid communication while preventing direct contact between contaminants and the plastic components, thus resolving the contradiction between ease of operation (plastic materials) and contamination resistance.
Solution Approach 2:
A flexible stainless steel mesh screen is used to create a protective barrier that maintains fluid flow while blocking contaminants. The thin film structure of the mesh allows it to function as both a protective shield and a flow passage, enabling the plastic components to operate without direct exposure to contaminated fluids.
2Device complexity
If the float and flow restrictors are positioned close to each other to compact the valve design, then the device complexity is reduced, but the plastic components are more exposed to contaminated fluid
Solution Approach 1:
The stainless steel screen serves as an intermediary barrier positioned between the float and flow restrictors, allowing them to remain in close proximity for compact design while preventing contaminated fluid from directly contacting the plastic components. The screen creates a protected zone for the plastic parts.
Solution Approach 2:
The protection strategy moves from spatial separation (distance) to a different dimension by introducing a protective barrier layer (the stainless steel screen). This allows the components to remain close in three-dimensional space while the screen provides a protective interface that prevents contamination.
3Reliability
If stainless steel materials are used for the float and flow restrictors to resist corrosion, then the reliability in contaminated environments improves, but the weight and operating force increase
Solution Approach 1:
The valve employs a composite material strategy where stainless steel components (screen, inlet restrictor, outlet restrictor) provide corrosion resistance in contaminated environments, while plastic components (float, body) provide lightweight properties. This composite approach allows the valve to achieve both corrosion resistance and light weight by strategically assigning materials to different functional components.
Solution Approach 2:
Different materials are assigned to different parts of the valve based on local requirements: stainless steel is used where corrosion resistance is critical (inlet/outlet restrictors, screen), while plastic is used where weight is more important and corrosion exposure is minimized (float, valve body). This local quality differentiation resolves the contradiction between weight and corrosion resistance.
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 design effectively prevents contamination and corrosion, ensuring reliable operation even in sewage environments by minimizing contact between internal components and contaminants, while maintaining pressure control and preventing vacuum damage.
Implementation Method 1
A combination air release valve features a stainless steel bottom float
Implementation Method 2
A first flow restrictor within the cavity, the first flow restrictor defining a first flow restrictor opening
Data Source
AI summary
A valve assembly for a combination air release valve includes a stem having a first end and a second end, a float supported on the first end of the stem, a seal holder on a second end of the stem, a seal supported on the seal holder, a first flow restrictor defining a first flow restrictor opening, a nozzle received within the first flow restrictor opening, the nozzle defining a flow channel therethrough, the seal configured to abut against the nozzle and seal the flow channel, and a second flow restrictor defining a second flow restrictor opening.