Depa DH40-FA - 7 Active Pulsation Damper; Principle of Function; Recommended Installation Schematic

35
DEPA
®
Air Operated Diaphragm Pumps
7.0 Active pulsation damper
7.1 Function
The active pulsation dampers are designed
for in-line installation. The pressure peaks of
theowingproductraisethediaphragmand
compromise the air cushion in the air cham-
ber.
When the displacement pressure in the pipe-
line drops, the diaphragm is pressed down
by the compressed air cushion which keeps
the pressure in the pipeline virtually con-
stant.
The pressure in the air chamber automat-
ically adjusts as a result of the internal air
control if the pressure in the pipeline is in-
creased due to system conditions.
Anyextrapressureneededissupplied
bytheairport;excesspressureescapes
throughthemuer.
We recommend installing the pulsation
damper directly on the discharge manifold of
the pump.
7.2 Recommended installation
schematic
Pulsation dampers can be mounted in any
position, as long as there are not intentions
to install diaphragm breakage monitoring.
Sketch 1
The air supply connection must always be
independent from the pump, so that the air
pressure for the pulsation damper can be
adjusted separately.
To achieve an optimal degree of damping of
the active pulsation damper the operating air
pressure must be determined through trials.
As starting value the pressure is set 0.5 bar
lower than the delivery pressure of the pump.
The optimal degree of damping can subse-
quently be determined by regulating up or
down in 0.1 bar increments.
Sketch 2
6 7 5
6
7
1 8
9 4 7
3
4
8
2
7 9
p1 p2p2p1
1. Pulsation damper
2. Air Operated Diaphragm Pump
3. Start-up valve (pressure
increasing valve)
4. Pressure reducer
5. Needle valve
6. Air supply
7. Pressure gauge
8. Flexible connection
9. Shut-off valve