Standard Liquid Ends - ProMinent Sigma X Operating Instructions Manual

12.2

Standard liquid ends:

Interval
After approx. 5,000 oper‐
ating hours
Quarterly
Quarterly*
Check the condition of the metering dia‐
phragm
Tightening torques
Liquid ends with integral relief valve
Maintenance work
Change gear oil - refer to "Changing gear oil" in this chapter.
Check the oil level.
Check that the metering lines are tight at the liquid end and
n
check for leak-tightness.
Check that the suction valve and discharge valve are firmly fixed
n
in place and tightly sealed.
Check that the dosing head screws are tight.
n
Check the condition of the metering diaphragm, see
n
the condition of the metering diaphragm' on page 67 .
Check that the flow is correct: Allow the pump to prime briefly.
n
Check that the electrical connections are intact.
n
* With normal loading (approx. 30% of continuous operation).
With heavy loading (e.g. continuous operation, aggressive feed chemicals
etc.): shorter intervals.
The diaphragm is a wearing part, the service life of which is dependent on
the following parameters:
Back pressure of the system,
n
Operating temperature,
n
Feed chemical properties.
n
The diaphragm service life is reduced when using abrasive feed chemi‐
cals. In these cases, more frequent checking of the diaphragm is recom‐
mended.
Data
Tightening torque for screws:
Ä 'Check
WARNING!
Warning of eye injuries
When opening the relief valve, a spring under high ten‐
sion can jump out.
– Wear protective glasses.
Maintenance
Personnel
Instructed personnel
Technical personnel
Value Unit
7.5±0.5 Nm
67