See my photo

[A.Mortezania]

Dear Friends,

Find my photo at attachment.
I took a photo form somewhere. Would you please let me know why someone installed check valve on equalizer line of expansion valves ????

I know that expansion valve should be near the distributor and also all of expansion valve such as power and body must be under insulation foam, My question is just : Why someone installed check valve on equalizer line ? Is it true ? I asked him, He told me I have two valves (after and before of expansion valve) and check valve on equalizer line. When I want to change orifice I close these two valves and check valve do not let R22 to go out form equalizer line of system.

Is this think OK ?

Sincerely your.

14736

[monkey spanners]

Thats no good, a ball valve would be better, or just pump the system down. Its not like you need to work on the expansion valve that often.

[RANGER1]

If it is a check valve, then it should be removed.
It senses pressure near expansion valve for correct operation, check valve prevents that
as the way described no pressure would reach TX valve.

[PaulZ]

Hi A
As MS said get rid or it. Because it is installed in the vertical for it to operate it would need a spring and that would need a pressure differential to open so the pressure either side of the valve would probably be different, kind of defeats the purpose of having an equaliser line to a degree.
I would ask how often the orifices have to be changed and if it is very often I would be looking for other issues in the system.
Regards
Paul