Assembly Of Valves With Threaded Connection - Bosch Rexroth DB 5X E Series Operating Instructions Manual

28/56 Assembly
Bosch Rexroth AG, DB(W)...5X/...E, RE25802-B/09.19
Table 9: Data for valve mounting screws for subplate mounting
Valve type + size
Component marking
Mounting screws
property class 10.9 according
to EN ISO 4762
1)
Tightening torque , related to the
max. operating pressure
Number of valve mounting screws 4
1)
Friction coefficient µ = 0.09 to 0.14

7.8 Assembly of valves with threaded connection

Faulty assembly!
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 assembly!
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 mounting surfaces 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 screwed directly into the safety valve. Observe the
tightening torque information by the pipe fitting manufacturer.
Table 10: Type of pipe fitting
Valve type + size
Component marking
Fitting with pipe thread according
to EN ISO 228 Part 1
DB(W)10...5X/...E DB(W)20...5X/...E
1151 1151
M12 x 50 M16 x 50
75 Nm 185 Nm
4
WARNING
DB(W)10.G.5X/...E DB(W)20.G.5/...E
1151 1151
G 1/2 G 1
DB(W)30...5X/...E
1151
M18 x 50
248 Nm
4
DB(W)30.G.5/...E
1151
G 1 1/2