Can refrigeration compressors compress liquid refrigerant?

No, in reciprocating compressors with linear displacement or piston, liquid in the
cylinder walls reduce the effectiveness of lubrication. If droplets of the coolant remain at the end of the compression remain to be vaporized, the liquid that is incompressible may force the damaging volume limit and damage valves. For this reason and others, the refrigeration cycle is modified so that the compressor only works with steam, it is the so-called dry compression.