Watson-Marlow PD/40 - Manual (Page 9)

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When the discharge pressure drops, the pulsation damper hose collapses and compensates for the
released volume of the pressing shoe in the discharge line. Hereby the pulse will be reduced.
Dependant on the application the damper can reduce the pulse down to 10%. The damper is most
effective above 500 kPa discharge pressure. The pulsation dampers can be applied up to a operating
pressure of 1600 kPa. The pulsation dampers are safeguarded for over-pressure by a pressure-relief
valve.
4.3 Pulsation damper hose
The pulsation damper hose liner material should be chemically resistant to the product to be pumped.
Dependent on the specific requirements of your application, a matching hose should be selected.
A. Outer extruded layer made of natural rubber
B. Four nylon reinforcement layers
C. Inner extruded liner
For each pulsation damper, various hose types are available. The material of the inner liner of the
hose determines the hose type. Each hose type is marked by a unique colour code.
Hose
type Material Colour
code Article number:
PD/40 PD/65 PD/100
NR Natural rubber Purple P040020 P065020 P100020
NBR Nitrile rubber Yellow P040040 P065040 P100040
EPDM EPDM Red P040075 P065075 P100075
Consult your Bredel representative for Hose Pumps for more detailed
information about the chemical and temperature resistance of pulsation
damper hoses.
Store the pulsation damper hose in a cool, dry place and do not subject
it to sunlight.
A B
C