PONNDORF Gerätetechnik GmbH
Leipziger Strasse 374
D - 34123 Kassel
Operation manual
Hose Pump type
P_high pressure 65
Page 5 of 26
Version 002_GB / 05.2017
2.6
Adjustment of pressure
Ponndorf hose pumps provide the opportunity to change the gap width between the shoes
and the inner surface of the pump housing. At applications with lower required discharge
pressures we recommend to enlarge the gap width in order to achieve a longer hose-
lifetime. On the other hand at high discharge pressures the gap width has to be reduced,
i.e. the contact pressure on the hose has to be increased.
The adjustment of the gap width is being effected by the shims included in delivery. The
shims between the rotor and the shoes have to be assembled or disassembled, always
depending on the required discharge pressure. In the following table you will find the
recommendations for the necessary quantity of shims to be installed, depending on the
discharge pressure.
For assembly and disassembly of the shims the lubricant bath and the casing cover have
to be removed. Each shim is fixed to the rotor by one screw. This screw must be loosened
just a little bit to enable assembling or disassembling of the shims.
Pump type
Pressure
Gap width in mm
Shims per shoe
P_high
pressure 65
0-7,5 bar
33,25
1 piece at 0,75 mm
up to 8 bar
32,5
2 pieces at 0,75 mm
up to 12 bar
31,75
3 pieces at 0,75 mm
up to 15 bar
31
4 pieces at 0,75 mm
Note: The above-mentioned quantities of shims per shoe are guideline values.
Depending on varying application conditions (pipework, varying properties of the
medium to be pumped etc.) it may be necessary to use one shim more or less at
each shoe!
Following pressure limits must be considered for the different hose materials:
Hose material
max. pressure
Natural rubber - NR
15 bar
EPDM
15 bar
Perbunan
– NBR
10 bar
In case of change of the used hose material a corresponding adjustment of pressure must
be made (see above).
The casing cover may only be removed when the drive is switched off and
the power supply is interrupted (remove fuses).
