Mankenberg M XTRA RP 840, Operating Manual

Page: 6 / 42

© 2020 MANKENBERG GmbH
- 4 -
If a pressure-regulating valve has to be dismantled:
The following must be observed at all costs:
First release the tension fully on the spring by turning the setting screw on the spring
module anticlockwise.
When doing so, be sure to follow the notes in Section 7 <Initial start-up>!
Then either seal off the two shut-off valves installed before and after the fitting in
accordance with the MANKENBERG installation recommendation and vent the pressure-
regulating valve or remove the pressure from the section of the system and then remove
the fitting from the pipeline.
If a fitting is removed from a system with a toxic medium and is taken out of the plant:
it must be properly decontaminated before repair.
4 Transport and storage
A fitting must be handled, transported and stored with care:
• The fitting must be transported and stored in its protective packaging until it is installed.
The fitting has moving internal parts.
Even packaged fittings should be transported smoothly without any shocks.
In the case of a fitting that can no longer be transported by hand, the lifting gear must be
attached to a suitable position on the housing (branches).
Under no circumstances may the lifting gear be affixed to any attachments (adjusting
screw, handwheel or accessories).
Pilot-controlled pressure-regulating valves in a sandwich design with slotted discs, in parti-
cular, are especially sensitive to transport damage and dirt.
The protective packaging on the body
must not be damaged during transport and storage.
•
•
When the fitting is stored prior to installation, it should be kept in closed rooms and protected against
harmful influences such as dirt, moisture and frost.
In special cases, the fitting is supplied free of oil, grease or silicone and is marked accordingly.
A fitting such as this must not come into contact with oil/grease/silicone during storage and handling
(particularly when subsequently unpacked).
• A MANKENBERG fitting generally has functional and/or sealing parts made of elastomer materials.
These cannot be stored for an unlimited period.
ISO 2230 describes the storage conditions for elastomers in detail and specifies the
permissible storage period.
Functional and sealing parts must be replaced well before the storage period
expires.
They are available from MANKENBERG as a “service set”.
See also Section 10 <Troubleshooting help>.
MANKENBERG fittings of small and medium nominal diameters are largely made of
stainless steel (high-alloy CrNiMo steel).
If, under exceptional circumstances, fittings are stored in a unpacked state, they
must be
protected against ferritic dust
to avoid corrosion.
danger of
fatalities
caution
caution
note
note
caution
caution