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Unloading the valve while
it remains in the system
1.
Release the locking of the adjustment spindle (2):
release the lock nut (1) by means of an open-end wrench by rotating it
counterclockwise.
2.
Purging the safety valve:
Screw out the adjustment spindle (2) to the stop by rotating the rotary knob (3)
counterclockwise. Now allow free flow through the safety valve for approx. 5...10
seconds so that dirt particles that might exist at the valve seat are removed by
the flow.
3.
Screw in the adjustment spindle (2) by rotating the rotary knob (3) clockwise so
that the lock nut (1) rests against the valve body without any play.
4.
Hold the rotary knob (3) and tighten the lock nut (1) by means of a manual torque
wrench applying the specified tightening torque by rotating it clockwise.
Table 18: Information on the lock nut
Valve type + size
Wrench size
Tightening torque
10.3 Repair
Damage to persons and property caused by improper repair!
In case of improper repair, the safety function of the safety valve is no longer given
in subsequent operation.
Only repair measures listed in chapter 10 "Maintenance and repair" are
f
admissible.
Only qualified personnel (see chapter 2.4 "Qualification of personnel") is
f
authorized to repair the safety valve.
The sealing and/or the safety cap must not be removed.
f
Remedying external leakage at the safety valve
The seals of hydraulic valves are subject to a natural process of wear and aging.
We thus recommend replacing them at appropriate time intervals. The intervals are
mainly determined by the operating conditions and the cleanliness of the hydraulic
fluid.
Regularly check the safety valve for leak-tightness!
f
As a precaution, exchange seals at reasonable time intervals.
f
If hydraulic fluid continues to leak after re-installation of the safety valve, the safety
valve itself is defective. In this case, send the safety valve to the manufacturer for
repair.
Maintenance and repair
DB(W)52...3X/..E
19
10 +5 Nm
WARNING
RE 25850-B/02.19, DB(W)52...3X/..E, Bosch Rexroth AG
39/52
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