1) MECHANICAL STEAM TRAPS

Most important characteristic of the mechanical steam traps is that they operate according to the difference of the density of steam and condensate which allows the condensate to flow.

The weight of the float, acting through the lever, keeps the valve closed when the trap is empty. As the condensate enters the trap, it raises the float and opens the valve overcoming the pressure acting on it. If no more condensate load is steady the float sets to produce a continues discharge. The condensate level in body is always above the valve creating perfect water seal the closed float trap is able to discharge the air through thermostatic air venting unit installed inside the body.

2) THERMOSTATIC STEAM TRAPS

Typical characteristics of thermostatic steam traps is to aperate according to the difference in temperature of steam and condensate. As the condensate cool, the liquid condenses lowers the internal pressure of the membrane. The resultant pressure differential will favor the external pressure acting on the membrane to retract and open the orifice, permitting the condensate discharge.

3) THERMODYNAMIC STEAM TRAPS

Thermodynamic steam traps operate periodically according to the difference in dynamic pressure of steam and condensate and discharge the condensate at the same temperature of the steam. Steam entering the trap expands suddenly as it reaches the backside of the disc. The resulting high flow velocity causes a decrease in pressure under the disk. Steam above the disc gets high pressure force and this pressure balance forces the disc onto the seat to close the orifice in other words to trap the steam.

When condensate appears at the trap inlet under and above the disc the pressure force above the disc disappears and allows the condensate discharge.