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1.5 PRINCIPLE OF OPERATION
HP & LH pumps have 2 rotors which turn in
opposite directions. Fluid enters the pump from
the inlet port and fills the space between the
rotors. This fluid is carried around the outside of
the rotors and is forced out of the discharge port
as the rotor lobes mesh together see Figure 1.
Each rotor is supported on a shaft and when the
pump is running within its operating limits, the
rotors never touch the inside of the rotor case, or
each other.
Figure 1 - Principle of operation (Showing vertical
mounting)
1.6 INTENDED USE
The pump should only be used for pumping the
media it was selected for and within the limits
specified in the technical datasheets. Any other
application
beyond
conversion
of
the
agreement with the manufacturer shall be
deemed to be not in accordance with the
intended use.
The pump may only be started up for the first
time if it has been ensured that all safety devices
the
intended
use
pump
without
written
are completely fitted and functional.
If any areas are subject to have the risk of
explosion, the relevant explosion-proof designed
pumps should be used.
Intended use also covers compliance with the
conditions
maintenance specified by the manufacturer.
The pump is only to be put into operation filled
with medium to be pumped.
Before starting up pay attention to:
- Open the valves on the suction side completely
to avoid cavitation and,
- Open the valves on the discharge side
completely to avoid exceeding the permitted
differential pressure of the pump
- Discharge-side safety measures should be done
(e.g. safety valve) to protect the pump from non-
permitted excess pressure
- Protection against contact for hot, cold and
moving parts must not be removed during
operation
1.7 TYPE DESIGNATION
The type designation can be found on the pump
name plate and also on both the order
confirmation and customer invoice.
Example (an X in the code denotes a special
version):
Type: HP/44-213/114
or
HP: pump series
44: pump type
213: Speed of the pump when the motor
operates at 50Hz
11: motor power in kW multiplied by ten (11 =
1.1 kW)
of
operation,
servicing
and
5
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