TXV's To Adjust or Not to Adjust - That is ....

[Refrigerologist]

[quote=philfridge;100895]

Many engineers' in this industry say "you should never adjust a TXV superheat setting as they are factory set".

This is correct and if you select the right size orifice no adjustment is required . Its all about knowledge and experience , however not everyone knows how to select the correct size orifice they then start messing with the t.e.v ?? why o why just leave them valves alone and get some training

If you read some of my previous posts you will see that I completely disagree. Valve superheat should always be checked and adjusted as per individual system requirements. As I have said, if we are not to adjust the valve then the manufacturer would not bother to fit an adjustment screw I would suggest you look at a selection catalogue for, say Danfoss valves, it will show that an orifice will provide different capacities at differrent conditions and the valve cannot be factory set to cover all of the possible conditions that the valve will need to cover!