function of steam trap- It is a device is used in steam pipe line to discharge condensate and gasses, prevent to escape of steam through the line. It ensures that steam is not wasted. This is a self contained valve which automatically drains the condensate from a steam containing device. This is generally provided in steam drains or before steam drain valve.
Types of steam trap:-

Mechanical trap – Works in the principle of difference in density between steam and condensate. This type of trap operate according the condensate level in the port if the condensate level increase the float operates and allow to condensate pass through the pipe ,when condensate level decrease is close the valve and doesn’t allow the condensate. Types of mechanical trap i) Float type, ii)Float with lever type, iii)Inverted bucket type, iv)Open bucket type.
Thermodynamic type steam trap - Works in the principle of difference in between thermodynamic property of steam and condensate.This types of traps operate due to velocity change in flow of compressible and non compressible fluids.As the steam starts condensate there is a temperature difference which allow the trap to operate. Types of Thermodynamic type steam trap   i) Disc type ii) orifice type.
Thermostatic type steam trap-  This trap works in the principle of difference of temperature in between  steam and condensate. Types of Thermostatic type steam trap i) Bimetallic type, ii) Metallic expansion type.   _{Your Comment}