Expansion Valve for air conditioning system. Uses #6 and #8 male insert o-ring fittings. Replacement is needed when valve is either clogged or evaporator is freezing.
How the valve opens and closes during operation is by refrigerant inside the sensing bulb and capillary tube changing. With the sensing bulb clipped to return line the refrigerant expands with heat causing pressure against the diaphragm which opens the valve. Lower temperatures cause less pressure against the diaphragm and closes the valve.
Evacuate the system using an ac refrigerant recovery system. Remove the cork tape exposing the bulb clamp on the low side line of the coil. Remove bulb clamp to be reused. Remove expansion valve using two wrenches using care to not bend the coils copper tube. Lubricate the #8 o-ring with refrigerant oil before installing the new valve. Clean the copper tube and reinstall the bulb clamp and cork tape. Pull vacuum on the system and wait 30 minutes to insure that the vacuum pressure remains the same which will verify there is no leaks at the new valve before charging the system.
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