Watson-marlow Bredel 265 User Manual download pdf (Page 18)

DESCRIPTION

4.4 Pump hose

4.4.1 General

A: Outer extruded layer made of natural rubber

B: Four nylon reinforcement layers

C: Inner extruded liner

The pump hose liner material should be chemically

resistant with the product to be pumped. Dependent on

the specific requirements of your application a

corresponding pump hose must be selected. For each

pump model various hose types are available.

The material of the inner liner of the pump hose

determines the hose type. Each hose type is marked by

a unique colour code.

The Bredel pump hoses have been carefully machined,

therefore there are minimum tolerances in wall

thickness. It is very important to guarantee the correct

compression of the pump hose, because:

• When the compression is too high, it creates a

too high load of the pump and pump hose,

which may result in a reduction of the life of the

pump hose and bearings.

• When the compression is too low, this will result

in loss of yield and backflow. Backflow results in

a reduction of the life of the pump hose.

B C

Hose type Material Colour code

NR Natural rubber Purple

NBR Nitrile rubber Yellow

EPDM EPDM Red

CSM CSM Blue

Consult your Bredel representative for

more detailed information about the chemi-

cal and temperature resistance of pump

hoses.

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Watson-marlow Bredel 265 User Manual Page 18