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

[US Iceman]

Thanks Iceman, so it is the same as an HFC or CFC system, flash gas in the liquid line, or shortage of gas causes the problem.

The situation is more readily noticed on ammonia TXV's because the volume of flash gas created is usually much higher than what you would see on HFC's or CFC's. It doesn't take very much flash gas to to start the wear patterns. My general recommendations are: if you don't have subcooling on a high pressure ammonia liquid line you ought to be thinking about rebuilding the TXV's every couple of years.

I have never heard it given that name before! I always called it needle and/or orifice seat wear!

Wiredrawing is just the term I have heard used for years to describe this. Probably from the old timers who tried to teach me.