18
3. Operation
Step 1 (Figure 5)
The APT14, APT14HC and
APT14SHC automatic pump trap
operates on a positive displacement
principle. Condensate enters the
body through the inlet swing check
valve causing the float to rise.
The float is connected to the trap
mechanism via a multi-link pivot.
If the upstream system pressure
PS is sufficient to overcome the
backpressure PB (Figure 4), the
build up of condensate will be
discharged through the opening two
stage trap mechanism.
In this way, the float will
automatically modulate according to
the rate of condensate entering the
unit, controlling the rate of opening
and closure of the trap.
Step 3 (Figure 7)
However, with the APT14, APT14HC and
APT14SHC, the condensate simply fills
the main chamber - lifting the float until the
changeover linkage is engaged, opening
the motive inlet and closing the exhaust
valve.
Step 2 (Figure 6)
With some temperature controlled
equipment, it is possible for the
system pressure PS to be lower
than the backpressure at PB
(Figure 6).
If this occurs a standard trap will
stall allowing the condensate to
flood the equipment being drained.
Fig. 5 APT14 shown
Fig. 6 APT14 shown
Fig. 7 APT14 shown
Condensate
inlet PS
Exhaust
Condensate
outlet PB
Condensate
inlet PS
Exhaust
Condensate
outlet PB
Motive
steam
inlet
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