Maintenance - ProMinent DHV-U Serie Manual De Instrucciones

5

Maintenance

CAUTION!
Elastomer seals can swell.
Hydrocarbon-based grease and cleaning agents can cause elastomer seals to swell.
– Do not treat elastomer seals with cleaning agents.
– Only grease elastomer seals using silicone-based greases.
CAUTION!
The required maintenance intervals may have to be shortened dependent on the feed chem‐
icals used and operating conditions.
Interval
Bi-annually
Every 2 years
Housing screws tightening torque
Threaded connection
Housing screws DN10 / DN15 /
DN20 / DN25 *
Housing screws DN32 / DN40 *
* greased
Maintenance work
Check the interior parts of the back pressure valve and replace if necessary,
especially the diaphragm and the piston seal.
To do this dismantle the back pressure valve, see "Repairs".
Replace the diaphragm.
Value
6 Nm
8 Nm
Check the tightening torque of the
housing screws after 24 hours' opera‐
tion.
Maintenance
49