Watson-Marlow PD/40 - Manual (Page 8)

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4 DESCRIPTION
4.1 Identification of the product
The pulsation damper and pulsation damper hose can be identified by the contents of the
identification plate on the pulsation damper housing and the hose label.
The identification plate of the pulsation damper contains the following information, relevant for
identification:
A. Type
B. Serial number
C. Identification number of Notified
Body (PD/65 and PD/100 only)
D. Year of manufacture
The hose label on the pulsation damper hose contains following information:
A. Re-order number
B. Internal diameter
C. Type of material of inner liner
D. Maximum permissible working pressure
E. Production code
4.2 Operation of the pulsation damper
The Bredel pulsation damper reduces the pulses created in the discharge line by the hose pump. This
is achieved by means of a thick-walled, reinforced rubber hose which is mounted in a carbon steel,
cylindrical pressure vessel. The hose is surrounded by compressed gas (air or nitrogen).
Pulses are created when a pressing shoe leaves the pump hose, while rotating. Instantly the volume
in the discharge line will increase with the volume of the pressing shoe. This will result in a pressure
drop in the discharge line.