Hi,

Need some advice from those who use Emerson EXV.

Few years back, there were some problems with Emerson EXV in some installations here. All of themhave same problems: Valve can't shut properly after some times in operations. In all installations, refrigerant are R22. Some oil type were POE, some were polyesther.

Back then, there were speculations that the valve seat suffers corrosion cause by R22, as some installation using R404A is not having these problems.

Some says corrosion cause by oil type.

Does anyone knows or encountered this kind of problem?

I am about to design an EXV system using R507, with RL68 grade of lubricant. My worry is if oil is going to be an issue, I'll scrap the idea of using Emerson valve.

Please advice.

Lai