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Bosch Rexroth H-4WEH...XE Series Operating Instructions Manual page 35

4/2 and 4/3 directional valves, internally pilot-operated, externally pilot-operated
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Checking electrical
connections
Bleeding the
hydraulic system
Performing a leak test
Proceed as described in the following sections to commission the valve:
Have the electrical connections checked for proper condition by or under the
guidance and supervision of a specialized electrician before the initial or any
re-commissioning.
Observe the operating instructions of the device and/or system into which the
valve is installed.
Before the actual operation, switch the valve several times with reduced pressure
(50% operating pressure). This will press out any remaining air from the valve.
Thus, mechanical damage caused by inadmissibly high acceleration of the fluid
and the valve control spool is avoided and the life cycle of the valve is extended.
Do not switch the valve under operating pressure as this may cause damage.
You can also achieve the switching movement of the valve control spool
necessary for the bleeding procedure by manual actuation of the manual
override, see chapter 9.2 "Operating the manual override (only relevant for
type H-4WEH./.NXE.)".
Ensure that during operation, no hydraulic fluid leaks at the valve or at the
connections.
Check whether there is internal leakage. This must be done according to the
possibilities provided by the hydraulic system.
Seals are subject to a natural aging process and for this reason, check seals
for damage and replace them, if necessary, every time you open the terminal
box. This check has to be carried out at least every 3 years from the date of
manufacture of the valve. For order details for seal kits, please refer to chapter
10.6 "Spare parts".
Valve-specific internal leakage may occur but does not have any influence on the
functionality of the valve.
RE 24751-XE-B/04.16, H-4WEH...XE..., Bosch Rexroth AG
Commissioning
35/52

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