Quote Originally Posted by taz24
They are pre set to about 6k superheat.
For 95% of all applications you do not need to touch them.
Only on rare occasions do you need to adjust.

If the valve and orifice are sized correctly then there is no need to adjust, from experience the problems occur when there is a miss match in valve, evap and system design.
I agree with taz. Except for the part about ouch them.

If the valves are properly selected for the installed application, then by all means check the superheat. I think you will find they are pretty darn accurate with the factory setting.

I think I may have started this by saying don't adjust the TXV's. I will stand by that comment.

In practice what I mean is don't try adjusting the valve on a service call. It either works or does not. If it has failed then change it.

Too many people adjust these to get some desired effect such as higher or lower suction pressure, trying to get rid of bubbles in a site glass, or heaven knows what else.

When you truly do have to adjust a TXV it is usually because someone else was there adjusting it before you.