What does the radiator trap prevent from discharging?

A radiator trap is a crucial component in steam heating systems, primarily designed to manage the flow of condensate, which is the water formed when steam cools and condenses. The trap's main function is to allow condensate (water) to exit the radiator while preventing steam from escaping into the atmosphere.

By permitting only the condensate to discharge, the radiator trap ensures that the steam system remains efficient, minimizing energy loss and maintaining the desired heating performance. The prevention of steam from discharging is vital, as it would otherwise lead to wasted energy, increased operational costs, and potentially disrupt the balance of the heating system.

In this context, the radiator trap effectively performs its role of sealing the steam inside the radiator while allowing the non-useful condensate to flow out, preventing steam loss. This feature enhances the overall efficiency of the steam heating system and ensures that the heat generated is utilized effectively.