Steam Trap – Bimetallic; 

The Bimetallic Steam Trap uses the Thermostatic principle of the unequal expansion of two metals (Bimetallic) at high temperatures to open and close the Condensate drain valve . When high-temperature Steam comes in, the Bimetal disk will heat and bend. Causes the stem to move upwards to close the valve, but if condensate water gets trapped in a steam trap , the condensate ‘s water temperature will gradually decrease until the Bimetal disk comes back straight and causes the stem to slide down to open Valve.