It is called liquid stroke at the free inlet of liquid in the cylinder of the compressor.
When this happens, the mass of refrigerant and the oil inside the cylinder are
is much larger than that allowed for flow in the valve
discharge, causing some of the internal components of the compressor to break.
(connecting rod, piston, valves, etc.).
To reduce the effects of this situation, it is used to secure the discharge valve assembly
by a spring which compresses from a force, thus allowing passage
coolant and oil.
