What is the significance of back pressure in steam traps? Is a higher or lower back pressure tolerance preferable? Why?

The back pressure of a steam trap refers to the pressure at the outlet end of the steam trap under operating conditions.

The back pressure tolerance of a steam trap should be as high as possible.

The higher the back pressure tolerance, the higher the pressure allowed at the outlet end of the steam trap during actual operation. In other words, steam traps with higher back pressure tolerance are more suitable for high back pressure working conditions.