30/44 Operation
Bosch Rexroth AG
, DB...5X/...XC, RE25802-XC-B/07.19
9.2 Setting the valve to the desired response pressure
WARNING
Explosion hazard! Damage to persons and property!
Depending on the adjustment position and the flow the valves may exceed the
max. pressure range.
▶
The set pressure must be monitored by means of a pressure gauge.
▶
Operation of the measuring port with pressure gauge is only admissible
in non-ignitable environments.
▶
Observe the counter pressure.
Explosion hazard caused by spark formation!
During adjustment works, adjustment speeds >1 m/s may cause inadmissible
heating of the valve and generate an ignition spark!
▶
Operation of the adjustment element is only admissible without additional aids
and only manually.
The valves can be set to any response pressure within the admissible pressure range
(
p
min
to
p
max
, see
"Data sheet 25802-XC"
).
For convenience, the system into which the valve is installed should be equipped
with a pressure gauge which indicates the pressure at port P. Alternatively,
a pressure gauge can be temporarily connected to the additional measuring port
which is normally sealed by a plug screw. This does not apply to type DB..G..-5X/..X..
1.
Deactivate or remove any other pressure limiting functions of the system which
act on the pressure port P. Seal any resulting openings, if required.
2.
With systems without installed pressure gauge, connect a pressure
gauge to the measuring port in the line which leads to the pressure port
(see
"Data sheet 25802-XC, unit dimensions"
).
3.
Turn the adjustment element counter-clockwise to the port (unload valve) to start
at the lowest possible response pressure.
4.
Switch on the system and wait until the system pressure has built up.
5.
Setting the desired response pressure:
Turn the adjustment element to the
right
to set the pressure relief valve
to a higher response pressure. Turn the adjustment element to the
left
to set the
pressure relief valve to a lower response pressure.
6.
Hold the adjustment element at the desired set pressure and tighten the lock nut
with 10...15 Nm.
7.
After removal of the pressure gauge at the measuring port, the measuring port
bore is to be sealed with the plug screw again
(Ma = 30 ± 3 Nm). Make sure that the seal is available and correctly seated.
To prevent dust from entering the adjustment device, the nut must be countered
at the valve body.
