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Bosch Rexroth H-4WEH...XE Series Operating Instructions Manual page 12

4/2 and 4/3 directional valves, internally pilot-operated, externally pilot-operated
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Safety instructions
Bosch Rexroth AG, H-4WEH...XE..., RE 24751-XE-B/04.16
non-compliance with functional safety!
The valve controls movements in machines or systems. In case of mechanical and
electric faults, e.g. failure of the energy supply, persons may be caught by the
system, kicked away or bruised.
When setting up your circuit, observe functional safety e.g. according to
EN ISO 13849.
Penetrating water and humidity!
In case of use in humid or wet environments, water or humidity may penetrate at
electrical connections or the valve electronics. This case may lead to malfunctions
at the valve and to unexpected movements in the hydraulic system which may result
in personal injury and damage to property.
Only use the valve within the intended IP protection class or lower.
Ensure before the assembly that all seals and caps of the plug-in connections
are tight and intact.
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.
The valve described has surface protection (see Data sheet "24751-XE"). If the
valve is used in a damp environment, the valve and the valve mounting screws may
corrode, which may reduce the preload force of the screw connection. To prevent
the valve from becoming loose and causing a risk of injury:
Exchange valves with corrosion damage at an early stage.
Check the surface protection at the valve and the valve mounting screws at
regular intervals.



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