Watson-Marlow SP40 - Manual (Page 20)

DESCRIPTION
17
The Bredel pump hoses have been carefully machined,
with minimum tolerances in wall thickness. To ensure
the correct compression of the pump hose, because:
•
When the compression is too high it creates an
excessive load on the pump and pump element,
resulting in reduced hose life and bearing life.
•
When the compression is too low, this will result
in loss of capacity due to backflow. Backflow
results in a reduction of hose life.
4.6.2 Hose compression force adjustment
(shimming)
In order to achieve optimal life of the pump hose, the
compression force of the pump hose can be adjusted by
placing a number of shims under the pressing shoes.
The shims are fitted between the rotor and the pressing
shoe. The number of shims will vary depending on the
operating speed and pressure. Refer to section 11.1.8.
4.6.3 Lubrication and cooling
The pumphead is filled with a special lubricant. The
lubricant lubricates the movement between the hose
and the pressing shoes and transfers the generated
heat from the hose to the pump housing and the cover.
The Bredel CIP pump needs to be filled with twice as
much lubricant compared to a standard pump of this
size. The lubricant is food grade. The user is
responsible to ensure chemical compatibility with the
fluid to be pumped (refer to section 11.1.4).
4.6.4 Gearbox
The hose pump types described in this manual use
various types of gearbox units. The gearboxes are fitted
with a foot rest.
Caution
Always apply the advised amount of
shimming for optimum hose performance.
Shim both shoes identically.