If a compressor is said to have a safety head, what does this imply?

A compressor described as having a safety head typically indicates that there is a mechanism in place to prevent the valve plate from being dislodged or damaged due to excessive pressures. This is often achieved through the use of springs that hold the valve plate securely in place while still allowing it to function effectively during normal operation. By ensuring that the valve plate remains properly seated, the safety head helps maintain the integrity of the compressor system and reduces the risk of failure, which can occur if the valve plate becomes dislodged under high pressure conditions.

The other options do not accurately reflect the function of a safety head. While features like safety locks or overload protectors may enhance the safety and reliability of a compressor, they do not specifically relate to the mechanics of holding the valve plate during operation. An automatic shut-off valve is another safety feature aimed at preventing over-pressure situations, but it is not directly connected to the concept of a safety head. Therefore, the role of the safety head is primarily focused on the mechanical stability provided to the valve plate through spring tension.