What role does a steam trap perform?

A steam trap is a critical component in steam systems, serving the primary function of removing condensate and non-condensable gases while effectively preventing the loss of steam. When steam travels through piping systems, it can come into contact with cooler surfaces, leading to condensation. If this condensate accumulates, it can lead to water hammer, decreased efficiency, and potential damage to the system.

Steam traps are designed to open to allow condensate and gases to escape, while remaining closed to steam, thereby ensuring efficient operation. By doing so, steam traps help maintain optimal pressure and temperature within the system without losing valuable steam energy.

The other options, while they may relate to aspects of steam systems, do not accurately represent the main function of a steam trap. Decreasing steam pressure or maintaining high-temperature steam are more relevant to the functions of control valves or pressure regulators, and adding water to the steam system pertains to feedwater systems rather than the operation of a steam trap. Therefore, the correct answer accurately reflects the critical role steam traps play in maintaining system efficiency and integrity.