172-65176MA-03 (UFO3 Series) 27 Aug 2015
5
Operation
Principles of air and condensate discharge:
1. Start-up Air and Cold Condensate
Discharge
At start-up, The UFO is on the launching
pad and initial air is discharged. When air
flows in with cold condensate, the UFO
floats off of the launching pad. However,
the bimetal is contracted due to the low
temperature. This holds the UFO away,
preventing it from closing against the
drain-jet allowing the discharge of all initial
air and cold condensate.
2. Entry of Steam
When steam flows in, the higher
temperature causes the bimetal to
expand, releasing the UFO. This allows
the UFO to float up and close off the
drain-jet.
3. Entry and Discharge of Condensate
As hot condensate enters replacing the
steam, the UFO looses buoyancy and
sinks back down to the launching pad,
allowing condensate discharge through
the drain-jet. When steam flows in again,
the UFO will once more rise and close off
the drain-jet.
Air
Steam
Condensate
