Bosch rexroth DBD 1X/ E Series Operating Instructions Manual page 43

10.2.1 General maintenance instructions
Remove coarse dirt from the exterior.
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Check all external fittings for completeness and tight seat.
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Check safety valve for external leakage, replace the seals if necessary, see
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chap. 10.3 "Repair".
Check the safety valve for corrosion. Corrosion is an indication of leakage.
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Remove the safety valve and have it repaired if there is any visible corrosion.
10.2.2 Maintenance interval for safety valves
For ensuring the function, the safety valves have to be made to respond on a suitable
test stand at regular intervals. It has to be checked whether the response pressure
complies with the information on the name plate. The time intervals depend on the
functional use of the safety valve and/or on the maintenance intervals of the overall
system.
Within the scope of this test, we recommend replacing the seals intended for
exchange by new ones. For order details regarding the seal kits, refer to chap. 10.4
"Spare parts".
If used as intended, Rexroth safety valves are designed for durability.
10.2.3 Unloading safety valves of type DBDH..1X/..E
To verify the function, the valve spring may - in safety valves of type DBDH..1X/..E -
be unloaded at regular intervals and the valve may then be made to respond at low
pressure.
Improper unloading of the safety valve!
Improper unloading of the safety valve DBDH..1X/..E in the system may cause
hazards or faults.
Only qualified personnel (see chap. 2.4 "Qualification of personnel") may unload
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the safety valve.
Observe the operating instructions and/or the functional set-up of the system.
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After unloading, the rotating spindle must be brought back into the initial
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position by means o the rotary knob. This is the only way to guarantee that the
valve will still work with the response pressure pre-set by Bosch
Maintenance and repair
WARNING
RE 25402-B/10.21, DBD...1X/..E, Bosch Rexroth AG
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Rexroth.