Inline Drain Line Flapper Access for Bidirectional HVACR Flushing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drain line cleaning methods for HVACR systems require manual operation of shut-off valves, which can lead to human error, damage to the drain line, and obstruction issues, and existing solutions like the Laufenberg device do not allow for full inline access or efficient flushing in both directions.
Innovation Solution
A drain line valve device with a main valve body and flapper assembly that allows inline installation, includes a removable top cover and adapter for pressurized gas or liquid flow, and features an automatic check valve that opens only during pressurized flow, enabling flushing in both upstream and downstream directions without manual operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manual shut-off valve is used to direct pressurized flow during cleaning, then the drain line can be closed off between the valve and clog to enable cleaning, but the valve may be accidentally left closed causing backup, or the rotational force may damage the drain line
Solution Approach 1:
The system uses the pressurized flow itself to operate the valve through a diaphragm mechanism. When pressurized gas or liquid is introduced, it automatically actuates the diaphragm to close the valve and direct flow in the desired direction, eliminating the need for manual operation and preventing human error
Solution Approach 2:
The manual mechanical valve operation is replaced with a pneumatic/hydraulic actuation system using a diaphragm. The pressurized fluid directly acts on the diaphragm to move the valve components, substituting human mechanical action with fluid-powered automation
2Reliability
If access is gained to the upper end of the drain line for pressurized cleaning, then cleaning can be performed effectively, but the drain line must be detached or cut requiring repair that compromises water tight integrity
Solution Approach 1:
The access device is nested within the existing drain line structure. The housing fits inside the drain line, and the valve assembly is contained within the housing, allowing the entire cleaning system to be installed inline without cutting or detaching the drain line from the HVAC equipment
Solution Approach 2:
The access device serves as an intermediary component installed within the drain line. It provides a interface for introducing pressurized cleaning fluid while maintaining the integrity of the original drain line, acting as a mediator between the cleaning operation and the drain line system
3Ease of manufacture
If a permanent inline assembly with manual valve is installed for drain line access, then cleaning can be performed without detaching or cutting the drain line, but the valve must be manually opened after cleaning or it acts as a clog
Solution Approach 1:
The system automatically resets itself after cleaning. When pressurized flow is introduced, the diaphragm mechanism automatically opens the valve to allow flow through the drain line. After cleaning is complete and pressure is released, the valve automatically returns to its default position, eliminating the need for manual operation
Solution Approach 2:
The valve operation is tied to pressure parameters. The valve state changes automatically in response to the presence or absence of pressurized flow, using pressure as the control parameter to switch between closed (during cleaning) and open (during normal operation) states
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 device provides convenient and efficient cleaning of drain lines by allowing pressurized flow in either direction, reducing the risk of human error and damage, while maintaining the integrity of the drain line and ensuring unobstructed access for maintenance and clog removal.
Implementation Method 1
a spring hinge for rotatably urging the flapper away from the flapper seat and into the normally raised position
Implementation Method 2
delivery of pressurized gas or fluid into the drain line forces the flapper against the resistance of the spring hinge and against the flapper seat, thereby sealing off the respective end of the main body and directing the pressurized gas or fluid in the opposite direction
Data Source
AI summary
A drain line access device is provided for flushing HVACR drain lines. The device includes a main body having input and outlet connection ports on opposite ends for inline installation to a drain line, a flapper assembly sized and configured for seated placement in an interior cavity of the main body, and a removable top cover. The flapper assembly includes a flapper holder, a flapper, a flapper seat, and a spring hinge for rotatably urging the flapper into the normally raised position. An injection port is provided on the top cover for delivering a flow of pressurized gas or liquid for flushing out a clog in the drain line. In operation, delivery of pressurized gas or fluid into the drain line forces the flapper against the flapper seat, thereby sealing off one of the respective ends of the main body and directing the pressurized gas into the drain line.