10
Prop. Directional Control Valve
Series D*FB / D*1FB
Operation Manual
Parker Hannifin CorporationParker Hannifin Corporation
D_FB-D_1FB_10-12 5715-669 UK.indd 25.06.19
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 mal-
functions. If the safety components are re-
paired by the user, the manufacturer's war-
ranty is invalidated because the
manufacturer is demonstrably unable to en-
sure that the product is used as specified.
Limits of use
The product may only be operated within the spec-
ified 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 heavi-
ly dependent on the purity and quality of the pres-
sure fluid and depend upon the operating condi-
tions of the hydraulic components. Appropriate filters
must be used and regular inspections of the medi-
um must be carried out to prevent contamination
of the pressure fluid. Permitted level of contamina-
tion 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 sus-
ceptible skin. This can be prevented by taking the
precautions that are usual when handling miner-
al 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 elec-
tromagnetic fields as a result of lightning, they
must be checked to ensure they are still work-
ing 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 tem-
perature above 80 °C, they may malfunction.
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*FB/D*1FB 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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