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What are the two most common types of pressure relief devices for refrigeration systems?

  1. Spring loaded relief valve and fusible plugs

  2. Bellows type valve and diaphragm valve

  3. Electro-mechanical safety valves and manual valves

  4. Thermal expansion valves and safety cut-off valves

The correct answer is: Spring loaded relief valve and fusible plugs

The two most common types of pressure relief devices for refrigeration systems are spring loaded relief valves and fusible plugs. Spring loaded relief valves operate based on a pre-set spring tension, which allows the valve to open and release excess pressure when it exceeds a certain threshold. This mechanism is essential for protecting the system from overpressure conditions that could lead to equipment failure or hazards. Fusible plugs, on the other hand, are designed to melt at a specific temperature, allowing refrigerant to escape and reduce pressure in the system if it overheats. This plays a critical role in preventing catastrophic failures due to excessive heat and pressure buildup. Overall, the combination of these two devices effectively mitigates the risks associated with pressure changes in refrigeration systems, ensuring safety and operational integrity. Other options do not include the most commonly used devices relevant to pressure relief in refrigeration, emphasizing why the chosen answer stands out as the correct one.