What is the purpose of the safety head in a refrigeration compressor?

The purpose of the safety head in a refrigeration compressor is specifically to relieve pressure that may build up due to liquid entering the cylinder. This situation can occur when liquid refrigerant flows into the compressor during operation, which can lead to what is known as a liquid slugging condition. Liquid slugging can damage the compressor as these machines are designed to compress gas, not liquid.

The safety head functions as a protective device that allows excess pressure to be released safely rather than allowing it to reach dangerous levels within the compressor. By releasing this pressure, it helps maintain the integrity of the compressor and contributes to the overall safety and reliability of the refrigeration system. Thus, its role is critical in preventing damage and ensuring proper operation.

The other functions listed, such as increasing cooling efficiency, maintaining a constant temperature, and regulating lubricant flow, are essential to the overall function of refrigeration systems but do not pertain specifically to the role of the safety head.