Drain Valve Flapper With Pressure Equalization for Gas Backflow
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Solution Overview
Problem
Traditional floor drain valves, such as gooseneck traps, face issues with space constraints, inaccessibility, and inefficiency in preventing backflow of gases while allowing liquid drainage, leading to potential blockages and health hazards.
Innovation Solution
The development of improved drain valve designs featuring a pressure equalization conduit with a ball valve, a securing and sealing system, and a flapper mechanism that ensures one-way flow, allowing liquids to flow while preventing backflow of gases, and incorporating features like elastomeric hinges and expandable rings for secure installation and pressure testing without removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gooseneck traps are used to prevent backflow of gases, then gas barrier function is improved, but space requirements increase and accessibility deteriorates
Solution Approach 1:
The valve body is divided into separate components including a flapper, hinge mechanism, and valve seat, allowing for compact installation while maintaining effective gas barrier function. The segmented design enables easier access to individual components for maintenance without requiring complete removal of the entire trap assembly.
2Reliability
If gooseneck traps are used to prevent backflow, then gas barrier function is improved, but installation space requirements increase
Solution Approach 1:
The flapper and hinge mechanism are nested within the valve body housing, creating a compact configuration that minimizes installation space requirements while maintaining effective gas barrier function. The nested design allows components to be housed efficiently within the available drain space.
3Productivity
If traditional drain valves are used to allow liquid drainage, then fluid flow is permitted, but pressure equalization is insufficient causing delayed opening
Solution Approach 1:
A pressure equalization port is introduced as an intermediary element that allows air to pass through the flapper, equalizing pressure on both sides of the valve. This mediator mechanism enables the flapper to open quickly in response to even small amounts of water by eliminating pressure differential resistance.
4Reliability
If drain valves are installed to prevent backflow, then gas barrier function is improved, but removal for pressure testing becomes difficult
Solution Approach 1:
The flapper is designed with dynamic characteristics that allow it to respond to pressure changes during testing. The hinge mechanism provides controlled movement that enables easy removal and reinstallation for pressure testing while maintaining effective backflow prevention during normal operation.
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
These designs enhance the effectiveness, manufacturability, and reliability of drain valves by ensuring unimpeded fluid flow, preventing backflow, and allowing for pressure testing without removing the valve, thus addressing the limitations of traditional systems.
Implementation Method 1
the ball valve structure being used to close the pressure relieving conduit for pressure testing of the drain or sewer below the valve
Implementation Method 2
permitting liquids to flow downwardly into the drain or sewer
Implementation Method 3
various drain valve embodiments described herein are configured to provide a drain valve that permits equalization of pressure above and below the valve so that even small quantities of water upon the upper surface of the valve will cause it to open and drain
Data Source
AI summary
A drain valve allows for drainage of fluids while preventing backflow of gases from a drainage system through the drain valve. A drain valve can have a first, sealed position in which a component of the valve seals an opening through the valve and a second, open position in which the component of the valve is separated from the opening to allow a fluid to drain through the valve. When the fluid has drained through, the component of the valve can return to the closed position. The valve can include a pressure relief conduit to help equalize pressure across the valve and permit unrestrained draining of fluid through the valve.