172-65452MA-04 (JH5RL-B/JH5RH-B) 18 Nov 2020
5
Operation
Principles of air and condensate discharge:
1. Initial Air and Cold Condensate Discharge
At startup, before steam is supplied the system is
cold and the bimetal plate is 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 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, closing off the orifice (B) opening. A water
seal is maintained at all times over the orifice (B) to
prevent steam loss.
Air
Steam
Condensate
