Those types of valves are uncommon in comfort cooling. We are here to learn from one another. The guy made a simple error in identifying what he was dealing with. Big deal. To all of you piling on the OP for posting what he found, you can all bite me. You all need a lesson in humility. Instead of acting like professionals and providing some real guidance, a handful of hacks tried to humiliate the OP and suggested he ought to know better. Well guess what? It’s gonna happen to you too. I really felt for the guy. Here he was at a call at 7PM on a Friday trying to solve a problem for a customer, found something rare and decided to share it and he was lambasted by some members of this sub. He ended up deleting his post which is a real shame because it took away an opportunity for others to learn from what he was dealing with. If it was up to me, members that display this type of behaviour in this sub would be booted out. But why would that matter? Apparently you all know everything about HVAC anyways.…