MSG11-5715-662 DCV UK.indd 21.07.22
Directly operated and pilot operated directional control valves
Series D1VW / D1DW / D3W / D3DW / D31DW / D41VW / D81VW / D91VW
6
Translation from German
Parker Hannin Corporation
Pressure uids
Certain rules apply to valve operation using dier-
ent pressure uids:
Mineral
oil
No restrictions
HFA
Oil in water
emulsions
Mandatory check
HFB
Water in oil
emulsions
Mandatory check
HFC Water glycols
Possible restric-
tions, recommend-
ed check
HFD
Anhydrous uids
(phosphate ester)
Possible restric-
tions, recommend-
ed check
The details of the various pressure uids
are provided for information only and do
not replace in-house testing under the
applicable operating conditions. In par-
ticular, the details cannot be interpreted
as a guarantee of media compatibility.
For detailed information about pressure
uids, see VDMA sheet 24317 and DIN
51524 51502. Special sealing materials
are supplied depending on the uid used.
Please ask the factory if you are unsure.
After a certain period of service, the hydraulic uid
must be replaced. The frequency of the change
depends on the following:
• Type and grade of pressure uid (ageing)
• Filtration
• Operating temperature and ambient conditions
Flushing
With large central pressurised oil stations
in particular, you are recommended to
ush the long pipes by short circuiting
the pressure and return lines. This pre-
vents the dirt occurring during installa-
tion from being carried to the valve.
Product support
If you require further support about the product,
about order processing or about solutions to prob-
lems, please contact your relevant sales company.
2. General notes on safety
Use of operating instructions
We would again like to remind you that
the commissioning and use of our prod-
uct must be based on these operating
instructions. They must
• be followed in full at all times,
• be kept in close proximity to the in-
stalled product, and be accessible at
all times,
• be passed on to any later owners,
• always be used in the version supplied.
The personnel whose job is to work with
this product must have read the operating
instructions – in particular the section en-
titled "General notes on safety" – before
starting work. This specically applies
to personnel who will only work with the
product occasionally (e.g. setting up,
maintenance).
Compliance with other rules and instructions
Carry out transport and installation/repair activities
only in accordance with the valid and applicable
safety and accident prevention regulations issued
by the trade associations.
The valve contains hydraulic oil. The normal lo-
cal environmental protection requirements must
therefore be met when handling the product.
The particular circumstances of each place of in-
stallation mean that instructions must be followed
in order to install and use the product safely.
Any health and safety warnings attached
to the product must be observed and
must be maintained in a legible state.
Air Bleeding of Hydraulic System
During initial startup, after an oil change as well as
after the opening of lines or valves the hydraulic
system must be air bleeded.
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