What is a possible cause for the suction valves snapping off when the compressor head is removed?

Liquid slugging occurs when a significant amount of liquid refrigerant enters the compressor instead of being vaporized, which can lead to severe operational issues. When the compressor is removed, the pressure change can cause the liquid to vaporize rapidly, creating a shockwave that can snap off the suction valves. This scenario typically arises from improper system operation, such as a malfunctioning expansion device or excessive refrigerant charge, resulting in liquid refrigerant directly entering the compressor.

In contrast, overheating generally affects the entire compressor and does not specifically lead to the snapping of suction valves upon removal of the compressor head. Electrical failure pertains to issues with the compressor’s motor and does not connect to the mechanical failure of the suction valves. Low refrigerant levels would typically result in inadequate cooling performance and wouldn't create the conditions conducive to breaking suction valves during compressor head removal.