The protection measures for compressor
There are two ways to protect the compressor：
1) The measure to protect from a compressed liquid
As we know the liquid can’t be compressed in the compressor (liquid could be the refrigerant liquid and oil). If there is too much liquid inside the cylinder, the connecting rod & piston could break.
#1 compress with oil heater.
#2 equipped with the accumulator (gas-liquid separator) in the suction pipe.
2) Pressure protection for the compressor
#1 high-pressure protection: To avoid the discharge pressure too high
#2 low-pressure protection: To avoid the suction pressure too low.
#3 Compressor with the safety value or films.
#4 oil differential protection. To ensure the compressor has enough oil.
#5 Medium pressure protection in the two-stage compressor.
Related article: The operation of screw compressor unit.
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