172-65461MA-03 (JH7.5R-B) 18 Nov 2020
5
Operation
Principles of air and condensate discharge:
1. Start-up Air and Cold Condensate Discharge
At start-up, before steam is supplied, the system is
cold and the bimetal plate is contracted (flexed
downward), keeping the air vent valve (A) open.
When steam is first supplied to the system, air is
discharged through the vent (A) while cold
condensate is discharged through the orifice(B).
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 inflowing condensate causes
the float to rise due to buoyancy, opening the orifice
(B) and allowing condensate to be discharged. The
air vent valve will remain closed throughout normal
operation due to the high operating temperatures.
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 with the orifice opening size varying
depending on the condensate flow rate.
4. Closed Position
When the condensate flow rate decreases, the float
falls, closing off the orifice opening (B). A water
seal is maintained at all times over the orifice (B) to
prevent steam loss.
Air
Steam
Condensate
