Float Drain Valve for Hermetic Radon Sump Covers
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Solution Overview
Problem
Existing radon mitigation systems with sump hole suction face challenges in managing liquid accumulation around the sump cover, particularly due to hermetic sealing which can lead to undesired liquid accumulation in the basement from events like groundwater infiltration or sewer backups.
Innovation Solution
An automatic drainage device is introduced, featuring a base platform with a valve opening, a support structure, and a floatable mechanism that automatically opens to allow liquid drainage when a certain level is reached, ensuring hermetic sealing and easy resetability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sump cover is hermetically sealed to prevent radon gas leakage, then radon mitigation efficiency is improved, but liquid accumulation in the basement increases
Solution Approach 1:
The sump cover system is segmented into two functional components: a hermetically sealed radon mitigation portion and a separate drainage portion. The drainage device includes a float valve mechanism that can independently open to allow liquid drainage while the radon seal remains intact, thus resolving the contradiction between maintaining radon sealing efficiency and preventing liquid accumulation.
Solution Approach 2:
A float valve mechanism acts as an intermediary between the hermetic seal and the drainage function. The float valve remains closed during normal operation to maintain hermetic sealing for radon mitigation, but automatically opens when liquid reaches a certain level, allowing drainage without compromising the radon seal integrity.
2Reliability
If the sump cover is hermetically sealed to prevent internal air leakage, then radon extraction efficiency is improved, but the complexity of the sealing system increases
Solution Approach 1:
The drainage function is extracted as a separate, independent mechanism from the hermetic sealing system. The float valve drainage device operates independently from the radon seal, allowing the sealing system to remain simple and effective for radon extraction while the drainage capability is added as a distinct functional element.
3Quantity of substance
If a manual drainage valve is installed to prevent liquid accumulation, then liquid drainage capability is improved, but the ease of operation decreases
Solution Approach 1:
The float valve mechanism is designed to operate automatically based on liquid level, eliminating the need for manual intervention. When liquid accumulates to a predetermined level, the float rises and automatically opens the valve to drain the liquid. When the liquid level drops, the float descends and automatically closes the valve, providing self-service drainage functionality.
Solution Approach 2:
The float valve system incorporates feedback through the float mechanism that responds to liquid level changes. The float rises with increasing liquid level, triggering valve opening, and falls with decreasing liquid level, triggering valve closing. This feedback mechanism ensures automatic, convenient operation without requiring user intervention.
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 automatic drainage device effectively manages liquid accumulation by automatically opening to drain excess liquids, maintaining hermetic sealing during normal conditions and preventing backflow, while being easily resettable and adaptable to various outlet shapes.
Implementation Method 1
The floatable body is operable to pivot the pivot body in the first pivot direction in response to a liquid acting on the floatable body
Data Source
AI summary
A sump cover having a receptacle and an automatic drainage device disposed in the receptacle. The drainage device includes a base platform defining a valve opening in communication with an outlet of the receptacle, a support structure attached to the base platform, a valve stem assembly, and a float assembly. The support structure includes a guide portion defining a slot in alignment with the valve opening. The valve stem assembly is slidingly disposed in the slot and includes a sealing member for selectively closing the valve opening. The valve stem assembly is moveable into a closed position, sealing the valve opening, and moveable into an open position, unsealing the valve opening. The float assembly includes a pin to selectively lock the valve stem assembly in the closed position and releases the valve stem assembly to the open position when a certain amount of liquid is present in the receptacle.