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Operation
Bosch Rexroth AG, DB(W)...5X/...E, RE25802-B/09.19
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 11.
8.
Return any other pressure limiting 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): Avoid counter pressure!
The following applies to valves with internal pilot oil discharge (i. e. valves without
Y port): In case of counter pressure in the discharge line T, the maximum possible
flow is reduced. There is a relationship between maximum admissible counter
pressure p
in the discharge line T and flow q
T
diagrams. Characteristic curves for intermediate values of the response pressure
which are not listed must be determined by means of interpolation.
When the flow approaches zero, the maximum admissible counter pressure p
in each case 10% of the response pressure. With increasing flow, the maximum
admissible counter pressure p
, which is illustrated in the following
V
decreases.
T
is
T
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