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Unloading the valve on
a separate test stand
(recommended)
Fig. 4: Loosening the locking
1.
Depressurize the system, verify the depressurized condition by means of a
pressure gauge so that the valve can be removed in a risk-free manner.
2.
Remove the valve from the system and assemble it on a suitable test stand
considering the necessary tightening torques.
3.
Release the locking of the adjustment spindle (2):
release the lock nut (1) by means of an open-end wrench by rotating it
counterclockwise.
4.
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.
5.
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. If the response
pressure is to be newly set, rotate the adjustment spindle so that at a suitable,
calibrated pressure gauge with the largest accuracy possible, the original
response pressure known from the valve component marking is displayed.
6.
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.
Depressurize the test stand (verify by means of pressure gauge) so that the valve
7.
can be removed in a risk-free manner.
8.
Remove the valve from the test stand and assemble it on the system considering
the necessary tightening torques.
Maintenance and repair
1
2
3
RE25802-B/09.19, DB(W)...5X/...E, Bosch Rexroth AG
41/56
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