Fog, other than the valve, how're you doing - it's been a while-?
The imediate concern is to somehow plug the leak to prevent any damage to the system (sounds like it's a suction side valve). All my advice from EZ's ? still stands, tefloned screw, etc - including the fact that I have the replacement part sitting in front of me (EZ never took me up on my offer to send it to him, do you want it?). Or you can do the Google search that Evan gave and find one.

Good luck with it, if you need any other help, ask away!