Assembly Of Valves With Threaded Connection - Bosch rexroth DBD 1X/ E Series Operating Instructions Manual

30/56 Assembly
Bosch Rexroth AG, DBD...1X/..E, RE 25402-B/10.21
Table 11: Information on mounting screws according to EN ISO 4762
Valve type + size
Component marking
Dimensions
Property class according to
EN ISO 4762
Tightening torque 1) , related to the
max. operating pressure
1) Friction coefficient µ = 0.09 to 0.14

7.9 Assembly of valves with threaded connection

Faulty installation!
In case of faulty assembly due to a mix up of the hydraulic ports, the safety valve
loses its safety function!
Check whether the pressure to be limited is connected to port P and the
f
discharge line is connected to port T.
Faulty installation!
A safety valve with threaded connection which you install under high mechanical
load generates additional forces during operation, which reduce the life cycle of the
safety valve and of the overall machine or system.
Mount the safety valve in a way that ensures that reaction forces which act on
f
the valve (e.g. due to vibration, shock) and hydraulic forces which act on the
connection lines (in particular when the line tears off) are absorbed by the
fixation in a risk-free manner.
The connection surface of the valve and the valve installation surface must be clean
and free from hydraulic fluid.
Use non-linting fabric for cleaning the valve installation surface.
f
1. Tighten pipe fittings which are directly screwed into the safety valve using the
tightening torque specified in table 12.
Table 12: Type of pipe fitting
Valve type + size
Component marking
Fitting with pipe thread
according to EN ISO 228 Part 1
Tightening torque 1) , related to
the max. operating pressure
1) Friction coefficient µ = 0.09 to 0.14
DBD6 DBD10
849 850, 390
M6 x 50 M8 x 70
10.9 10.9
12.5 Nm 28 Nm
WARNING
CAUTION
DBD6 DBD10
849 850, 390
G 1/4 G 1/2 G 1
60 Nm 130 Nm 380 Nm
DBD20 DBD30
361 362
M8 x 90 M10 x 110
12.9 12.9
28 Nm 56 Nm
DBD20 DBD30
361 362
G 1 1/2
600 Nm