Refrigerant Service Port Valve with Flashback and Leak Protection
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Solution Overview
Problem
There is a need for a refrigerant service port valve that reduces the risk of refrigerant leakage and flashback in automotive air conditioning systems, particularly when retrofitting to use hydrocarbon refrigerants like HCR188C, which is not approved for direct replacement of CFC-12 but can be used as a replacement for HFC-134a, while ensuring safety against fire and explosion risks in the event of a crash.
Innovation Solution
A refrigerant service port valve with a valve body and a slider mechanism that includes a one-way check valve and a flame arrestor, designed for inline insertion in air conditioning systems, featuring a male quick connect fitting and a setscrew for locking, which aligns passages to allow servicing while preventing flashback and backflow, and is color-coded for EPA approval for hydrocarbon refrigerants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a service port valve is installed to allow servicing of the air conditioning system, then the system can be maintained and refilled with refrigerant, but the risk of refrigerant leakage and flashback into the passenger compartment increases
Solution Approach 1:
A service port valve is installed as an intermediary component between the refrigerant system and the external service environment. The valve includes a body with a service passage that can be opened or closed to control refrigerant flow during servicing operations, thereby enabling maintenance while preventing uncontrolled leakage.
Solution Approach 2:
The service port function is extracted as a separate, isolated component from the main refrigerant circuit. The valve can be closed off completely when not in use, effectively removing the potential hazard pathway while maintaining the ability to access the system when needed for servicing.
2Object-affected harmful factors
If a check valve is installed to prevent flashback, then safety is improved, but the device complexity increases
Solution Approach 1:
The check valve function is merged with the service port valve body into a single integrated component. The check valve is installed within the valve assembly to prevent flashback during servicing operations, thereby improving safety without requiring a separate, additional device that would increase overall system complexity.
Solution Approach 2:
The service port valve is designed to perform multiple functions simultaneously: it controls refrigerant flow during servicing, prevents flashback through the integrated check valve, and can be closed to isolate the system. This multi-functionality reduces the need for separate components and simplifies the overall valve assembly.
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 valve effectively reduces the risk of refrigerant leakage and flashback, ensuring safety by preventing backflow and ignition in the event of an accident, while allowing safe servicing and retrofitting of existing air conditioning systems to use hydrocarbon refrigerants.
Implementation Method 1
A one-way check valve and a flame arrestor may be disposed in the main fluid passage
Implementation Method 2
A one-way check valve and a flame arrestor may be disposed in the main fluid passage
Implementation Method 3
a valve body defining a main fluid conduit adapted for insertion into a coolant line using compression fittings at opposite ends of the conduit
Data Source
AI summary
The refrigerant service port valve for air conditioners has a valve body defining a main fluid conduit adapted for insertion into a coolant line using compression fittings at opposite ends of the conduit. A pedestal is mounted on the exterior conduit wall. The pedestal has a bore therethrough forming a lower service passage that enters the main fluid conduit, and an internally threaded blind bore parallel to the lower service passage. A slider is mounted on the pedestal, the slider having a male quick connect fitting defining an upper service passage. The upper service passage may be aligned with the lower service passage in an open position to service the system, or the slider may be moved to align the upper service passage with the blind bore to access a setscrew, which is raised partially into the upper service passage to lock the valve in a closed position.