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Contaminated hydraulic fluid!
Contamination in the hydraulic fluid may cause functional failures e.g. jamming
or blocking of nozzles of the valve. In the worst case, this may result in unexpected
system movements and thus constitute a risk of injury for persons.
▶
Ensure adequate hydraulic fluid cleanliness according to the cleanliness classes
of the valve over the entire operating range.
Leakage in case of incorrect working temperatures!
Use of the valve outside the approved temperature ranges may lead to permanent
leakage at the valves. Thus, hydraulic fluid in the form of a leaking hydraulic fluid jet
may injure persons, lead to damage to property and endanger the environment.
▶
Only use the valve within the intended environmental and hydraulic fluid
temperature range.
▶
In case of leakage, immediately exchange damaged seal rings or the valve.
Corrosion!
The valve described has a surface protection (refer to "Data sheet 22047-XD"). Use
of the valve in humid environments still holds the danger of corrosion on the valve
and on the valve mounting screws and thus a reduction of the preload force of the
screw connection. To avoid loosening of the valve and mitigate the associated risk:
▶
Exchange the valves with corrosion damages as soon as possible.
▶
Check the surface protection at the valve and the valve mounting screws
at regular intervals.
Contact with salt water leads to increased corrosion at the valve. This
can lead to chemical corrosion of individual components of the valve.
Therefore, take suitable corrosion protection measures.
2.7 Notices on the valve use
Observe the following information during the project planning:
▶
In case of bank assembly, only one solenoid of all valves may be energized
at a time.
▶
When operating 4/2 directional seat valves to control differential cylinders, the
annulus area of the cylinder must only be connected with connection A of the
valve. Otherwise, pressure peaks will be created while switching, which will
exceed the maximum operating pressure.
▶
If due to the operating conditions to be expected during the switching processes,
flows have to be anticipated that exceed the valve's performance limits that can
be seen from the characteristic curve, a valve with throttle insert must be used
in channel P for flow limitation.
▶
In order to switch the valve safely or maintain it in its spool position, the pressure
at the respective ports must satisfy the following condition: P ≧ A ≧ T for the
3/2 directional seat valve, and/or P ≧ A ≧ B ≧ T for the 4/2 directional seat valve.
Safety instructions
CAUTION
RE22047-XD-B/02.19, M-.SE 6 ...XD..., Bosch Rexroth AG
15/52
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