I have a broken Semihermetic Compressor diagnosed for 'Liquid Return' that washed the oil. This are the damages encountered:
1.-Scratched pistons. (I'm not English native so please correct)
2.-Scratched and premature wear of Oil Pump.
3.-Excesive wearing on bearings/bushings.
4.-Overheating of Valve Plates.
5.-Excesive wearing on Tie rods.

Are this damages encountered enough to determine the cause of damage was 'liquid return'?????

Also I thought that the Oil Differential Pressure Control (Jhonson Controls P545NCB-25) had the ability to protect against liquid return, I'm I wrong?

Thank you!