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Parker Hannifin Corporation
Proportional DC Valves
Series D*FC, D*1FC
Operation Manual
D_FC 5715-686 UK 07.02.2019
Use of the product
The product must only be used if it is perfect in
working order. Problems that may impair safety
must be corrected.
This product is a safety component that may
only be repaired by the manufacturer if it
malfunctions. If the safety components are
repaired by the user, the manufacturer's war-
ranty is invalidated because the manufac-
turer is demonstrably unable to ensure that
the product is used as specified.
Limits of use
The product may only be operated within the speci-
fied limits of use. The relevant details can be found
in „Technical data“.
Ambient conditions must be observed. Un-
authorized temperatures, shocks, the effects
of aggressive chemicals, radiation, unauthor-
ized electromagnetic emissions may result in
disruptions and failures. Observe the limits
of operation set out in „Technical data”.
Contaminations
Function and service life of the valve are heavily
dependent on the purity and quality of the pressure
fluid and depend upon the operating conditions of
the hydraulic components. Appropriate filters must
be used and regular inspections of the medium
must be carried out to prevent contamination of the
pressure fluid. Permitted level of contamination is
set out in the „Technical data“.
Be aware of three important sources of con-
tamination:
• Contaminations entering during installation
• Contaminations occurring during operation
• Dirt entering from the surroundings
Remaining risks
Allergic reactions
Hydraulic oil can cause allergic reactions on
susceptible skin. This can be prevented by taking
the precautions that are usual when handling min-
eral oil products and by using personal protective
equipment.
Leaking plugs
Leaking plugs can cause a malfunction. That
is why the plugs must be checked for leaks
at the regular maintenance interval. Leaking
plugs may constitute a safety hazard, so the
valve must be returned to Parker for repair.
Lightning
If electronic components are exposed to
electromagnetic fields as a result of lightning,
they must be checked to ensure they are still
working perfectly. If there is a malfunction,
the product must be returned to Parker.
Temperature
The surface of our product may heat up in use.
The service temperatures may exceed the
temperature threshold for burn injury, 70 °C.
Above this threshold, even brief contact with
the surface may result in a burn. The only way
to consistently prevent burn injuries is to use
personal protective equipment and to remain
safety-conscious at all times.
If integrated electronics are exposed to a
temperature above 80 °C, they may malfunc-
tion.
Power failure
In a power failure the valve piston returns to
the spring centred starting position. You must
check whether this creates potential hazards
when the system/machine is used.
Hydraulic
D*FC/D*1FC valves are tested and approved with
an even flow. If the flow becomes asymmetrical,
the safety function of the valve may be compro-
mised. You should therefore carry out tests before
commissioning to verify that the valve is in good
working order.
If the valve piston has been under pressure and
stationary in the end position for an extended pe-
riod, oil particles may cause the piston to seize. For
this reason the valve should be actuated regularly.
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