172-65484MA-04 (JH3S-B/JH5SL-B/JH5SH-B) 7 Jan 2019
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. This allows for the rapid discharge of air
and cold condensate through the vent (A)
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, 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
