Four pages ... - and you know
how live switching functions!
Pressures and flows are important
Two columns are connected in series, and a pressure of
P
A
is connected to the beginning. Atmospheric pressure
is present at the end. The pressure distribution and
flows are then as shown on the right.
Conclusion:
In the straight operating mode shown here, the pressure
P
M
is present in the middle between the two columns.
Four pages ... - and you know howlive switching functions!
NOTE:
In reality, the pressure drops are not linear, they are curved.
Time for reflection
The pressure P
M
read on the Y-axis in the above figure
is now applied between the two columns. The input of
column A is left open. This results in a pressure dis-
tribution and flows as shown on the right.
Conclusion:
Backflushing is now being carried out in column A.
The solution: the back T-piece
If we connect the two columns using the back T-piece
and add the two solenoid valves MV
Back
and MV
Back
_____
we have completed the backflush circuit!
Straight operating mode
MV
Back
is open, MV
Back
_____
closed. The figure at the top
fits again.
Backflush operating mode
MV
Back
is closed, MV
Back
_____
open. The center figure fits
here.
P
P
A
M
Atm.
Column A
Column B
P
M
Atm.
Column A
Column B
MV
P
A
P
M
BACK
MV
BACK
Column A Column B
Back T-piece
Four pages ... - and you know how live switching functions!
6 - 4
live.chp, Issue August 17, 1999
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