working procedure of thermodynamic steam trap

 Thermodynamic steam trap is one kind of steam traps in piping system, today we introduce working procedure of thermodynamic steam trap. Welcome to enjoy it

The thermodynamic steam trap consists of a simple metal disc type valve.

  1. The whole opening and closing procedure of the valve depends on the pressure energy of the steam. As shown in the figure(i),

  2.The disc A is raised off from the seat C when the incoming pressure acting on the disc increases. Air and condensate flows through B when the disc is raised.

  3.Now when the condensate approaches the trap orifice the temperature increases and it flashes to steam.

  4.Due to this the fluid that is flowing through B increases because of an increase in dynamic pressure and reduction in static pressure.

  5.Thus the disc is pulled towards the seat but it will never sit completely.

  6.The steam will continue to escape from around the disc and will accumulate in the control chamber D as shown in the figure (ii).

  7.When the pressure in the chamber D becomes more than the incoming condensate pressure, it acts on the full surface area of the disc and pushes the disc towards the seat.

  8.This makes the disc snap shut over the orifice. The advantage and importance of this snapping action is that it removes an foreign particle that might got stuck to the seat and also ensures that the valve is closely shut without any leakage

  9.After sometime the condensate pressure will again increase, lifting the disc and the cycle will be repeated.

  10.Generally the Thermodynamic steam trap will remain open for around 15-20 seconds, but then it usually depends on the steam pressure and ambient air temperature inside the trap.

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