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7.
Switch off the system, let the pressure decrease, depressurize any provided
pressure accumulators, if applicable. Remove the temporarily installed pressure
gauge and seal the additional M port using the plug screw. Tightening torques,
see table 13.
8.
Return any other pressure relief devices which are installed in the system and
have an impact on channel P and which you have deactivated or removed before
to the normal operating state.
As an alternative to the procedure described above, the safety valve may also be
removed and set to the desired lower response pressure on a test stand.
9.3 Operation with counter pressure in the discharge line
In principle, the safety valve should be operated without counter pressure in the
discharge line, if possible.
The following applies to valves with external pilot oil discharge (i.e. valves with
Y port) without counter pressure in pilot oil return line:
Admissible counter pressure in the discharge line (port T) < 10 bar.
The following applies to valves with internal pilot oil discharge (i.e. valves without
Y port) without counter pressure in the discharge line (port T):
With internal pilot oil return, the system pressure increases by the counter pressure
in the discharge line (port T) with increasing flow (observe AD2000 - data sheet A2 -
item 6.3).
To ensure that this increase in system pressure caused by the flow does not exceed
10% of the set response pressure, the admissible flow has to be reduced dependent
on the counter pressure in the discharge line (port T).
RE 25880-B/10.18, DBA...1X/...E, Bosch Rexroth AG
Operation
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