hhhhhhhhhhmmmmmmmmffffffff

hi mr.reefer mechanic i want to ask something because i have new overhaul compressor so i installed in my unit all the system is clean i use nitro and r-141 and i vacuum the system and then i replace a new filter dryer, i operate the unit, after 30mins i see a abnormal movement of my oil compressor because i see in the sight glass that will become empty so no oil come back in my crankcase right???!!so maybe i have a defective TEV may i right??? pls help me

thank you so much