15 Accessories
15.2 Overflow valve
Installing the fluid heating system
Personnel qualification:
o
Fitter
Personal protective equipment:
o
Work clothing
o
Protective gloves
o
Safety boots
Requirement:
ü
Pump unit disconnected from the electrical power supply, deenergized and secured against being
switched back on
ü
Shut-off devices closed
ü
Pump unit cooled down to the ambient temperature
ü
Pump emptied
915.8
424
483
222
915.9
739.10
739.7
739.8
1.
Remove the socket screws
915.9
on the end cover
540.1
of the pump.
2.
Remove the flat gasket
222
and carefully clean the fitting surfaces at the outer housing and end
cover.
3.
Lightly grease the O-ring
739.10
and insert it into the heating cover
483
.
4.
Bond the new flat gasket onto the fitting surface of the outer housing.
5.
Mount the heating cover with O-ring and end cover.
6.
Tighten the socket screws
915.9
with torque.
Commissioning the fluid heating system
1.
Take the required heating-up periods into account
Ä
2.
When setting the pressure and temperature of the heating fluid take the permissible operating
limits of the pump into account
15.2 Overflow valve
1
The installed overflow valve
1
(optional) ensures that very high pressures that could cause housing
parts to burst do not arise.
The overflow valve is purely there as a safety element of the pump and should not be used for control
or regulation purposes such as maintaining pressure. If the valve is kept open for too long under ad-
verse operating conditions (high differential pressures and/or low viscosities) it will only take a few
seconds for the overflow valve to become damaged. As a result, the overflow valve will leak perman-
ently and there will be a corresponding reduction in the delivery rate. In addition to this, circulation
through the overflow valve for too long results in excess heating of the pump. This reduces viscosity
and can ultimately lead to pump failure.
54
OIC 18en-GB Edition 2020-01
Operating instructions
