172-65419MA-05 (FJ32D-B+BD2) 1 Oct 2021
5
Operation
Principles of air and condensate discharge:
1.
Air and Cold Condensate Discharge at
Startup
At startup, before steam is supplied, the
system is cold and the bimetal plate is
flexed downward, keeping the air vent
valve (A) open. This allows for the rapid
discharge of air through vent (A) and cold
condensate through orifice (B) when
steam is first supplied to the system.
2.
Condensate Discharge
After the discharge of initial air and cold
condensate, the heat of the inflowing
steam and condensate cause the bimetal
plate to flex upward, closing the air vent
valve (A). The rising condensate level
causes the float to rise due to buoyancy,
opening the orifice (B) and allowing
condensate to be discharged.
The flexed bimetal keeps the valve closed
while in normal operation.
3.
Discharge of Large Quantities of
Condensate
Increases in the condensate inflow rate
cause the condensate level in the trap to
rise. The float consequently rises and
enlarges the opening of the orifice (B),
allowing more condensate to be
discharged. In this manner, continuous
condensate discharge occurs while the
opening size of the orifice varies
depending on the condensate flow rate.
4.
Closed Position
When the condensate flow rate
decreases, the float falls as condensate is
discharged, closing off the orifice (B). A
water seal is maintained at all times over
the orifice (B) to prevent steam loss.
Air
Steam
Condensate
