172-65237A-01 (J10) 11 Mar 2021
5
Operation
Principles of air and condensate discharge:
1. Valve Opening & Initial Condensate
Discharge
At start-up, when a large quantity of condensate
flows into the trap, the float (A) rises by buoyancy,
opening the pilot orifice (E). Condensate flows
through the pilot orifice (E) into the control
chamber (F), increasing the pressure there. The
increased pressure causes the piston (D), and
accordingly the main valve (B), to move up. The
orifice on the main valve seat (C) is then opened
to discharge condensate.
2. Valve Closing & Water Seal
When condensate has been discharged, the float
(A) falls, closing the pilot orifice (E). Pressure in
the control chamber (F) decreases due to
leakage through small holes. The main valve (B)
moves downward, closing the orifice of the main
valve seat (C). The orifices are completely water-
sealed during operation, permitting no steam
leakage.
3. Regular Operation
After the large quantity of initial condensate
formed at start-up has been discharged, the
equipment reaches a thermally balanced state,
forming condensate in accordance with the load.
The trap then discharges condensate by a
modulating float dynamic principle.
Float Dynamic Principle
When a large quantity of condensate flows into the
trap, the float (A) rises immediately, opening the
pilot orifice (E) wide. Condensate passes through
the pilot orifice at a high velocity into the control
chamber (F), where the pressure increases rapidly
due to flashing condensate. The rapid expansion
causes a force to be exerted on the main valve
(B), opening the large orifice on the main valve
seat (C) instantly. As condensate discharges
through the main valve seat orifice at a high
velocity, condensate in the equipment and trap
inlet pipe is also discharged.
Steam
Condensate
A
E
B
C
D
F
A
E
B
C
D
F
A
E
B
C
D
F
E
B
C
F
D
