Hey guys. I'm an engineering student working on a small liquid chiller project. I'm trying to find a couple R-22 expansion valves in the 1/3 to 1/2 ton range and I need them to have a bleed port since my compressors are PSC type rotaries. I'm scrounging around ebay since I don't want to spend a fortune on retail priced valves and it has proved very difficult to find them with a bleed port (either that or nobody properly identifies the valve numbers). Is there any reason why I couldn't just braze in a length of small diameter cap tubing parallel with the valve to act as an external bleed port, choosing a small enough dia/long enough length so as to not significantly affect valve operation, but large enough to be able to recycle the compressor after a couple minutes? Seems to me like a simple way around the problem.
Thanks in advance!