Copeland 998-0510-11 Valve Kit

Good morning. I would like to add oil on semi hermetic compressor, and I would like to have description of 998-0510-11 valve kit how it’s works. I now I have isolated compressor and reducing pressure in crank case before adding oil that way I asked description of valve. Thank you in advance.

It is an 1-3/8" service valve where you can close it when you service the compressor. There are at least two service valves on the compressor however one is the suction and the other one is the discharge.