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Types of steam trap:
 

Thermostatic (operated by changes in fluid temperature) -

The temperature of saturated steam is determined by its pressure. In the steam space, steam gives up its enthalpy of evaporation (heat), producing condensate at steam temperature. As a result of any further heat loss, the temperature of the condensate will fall. A thermostatic trap will pass condensate when this lower temperature is sensed. As steam reaches the trap, the temperature increases and the trap closes.

*Liquid expansion steam trap
*Balanced pressure steam trap
*Bimetallic steam trap
 

Mechanical (operated by changes in fluid density) -

This range of steam traps operates by sensing the difference in density between steam and condensate. These steam traps include 'ball float traps' and 'inverted bucket traps'. In the 'ball float trap', the ball rises in the presence of condensate, opening a valve which passes the denser condensate. With the 'inverted bucket trap', the inverted bucket floats when steam reaches the trap and rises to shut the valve. Both are essentially 'mechanical' in their method of operation.

*Ball float steam trap
*Inverted bucket steam trap
 
 

Thermodynamic (operated by changes in fluid dynamics) -

Thermodynamic steam traps rely partly on the formation of flash steam from condensate. This group includes 'thermodynamic', 'disc', 'impulse' and 'labyrinth' steam traps.

*Thermodynamic steam trap
*Impulse steam trap
*Labyrinth steam trap
*Fixed orifice traps
 
 

 

 

 
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