Quote Originally Posted by NH3LVR
I need to think about that awhile. The few cases I have seen the TX valve shut down when the head failed.
This is a little bit of a stretch I know. But as you have stated already, if the fans shut down the TXV should close also.

This is the only way I can think of where the valve might tend to leak liquid sometimes (although I don't think it would not be a great amount by any means).