Refrigeration Plant Operator B Practice Test

What action does the safety head take when high pressure is detected in the cylinder?

1. Stops the compressor

2. Relieves pressure through an overflow

3. Lifts to pass liquid refrigerant into the discharge line

4. Forces the compressor to vent

The correct answer is: Lifts to pass liquid refrigerant into the discharge line

When high pressure is detected in the cylinder, the safety head is designed to protect the system by managing and alleviating excess pressure. In this instance, it lifts to allow liquid refrigerant to pass into the discharge line, which effectively helps in decreasing the pressure within the cylinder. This action is crucial for preventing potential over-pressurization, which could lead to mechanical failure or leaks. The primary function of this mechanism is to maintain safe operating conditions by automatically adjusting the refrigerant flow and enabling safe disposal of excess pressure, thereby ensuring the overall efficiency and safety of the refrigeration system. Properly functioning safety heads are essential components in refrigeration systems, ensuring they can handle variations in pressure without compromising system integrity or safety.