26/44 Assembly
Bosch Rexroth AG
, DB...5X/...XC, RE25802-XC-B/07.19
Table 7: Tightening torque of valves for subplate mounting
Valve type
Bolt dimension
Tightening torque
DB10...5X/...XC
M12 x 50
75 Nm ± 10%
DB20...5X/...XC
M16 x 50
185 Nm ± 10%
DB30...5X/...XC
M18 x 50
248 Nm ± 10%
If the valve is to be used at a reduced maximum pressure and is to be mounted
on connection surfaces of a different material in this connection, it might
be necessary to use a lower tightening torque in order to avoid any damage.
7.7.2 Assembly of valves with threaded connection
The ports of the valve must be clean and free from hydraulic fluid.
▶
Use non-linting fabric for cleaning the ports.
1.
Remove the transport protection from the valve and keep it safe for returns
in case any repairs become necessary later.
2.
If required, fix the valve in place using the two valve mounting screws
(see
"Data sheet 25802-XC, unit dimensions: threaded connection"
).
WARNING!
Faulty assembly! A valve with threaded connection which you install
under high mechanical load generates additional forces during operation, which
reduce the life cycle of the valve and of the overall machine or system.
▶
Mount the valve in a way that ensures that reaction forces which act on 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.
3.
Check the seal rings at the pipe fitting for completeness. Other sealants are
inadmissible.
4.
Tighten pipe fittings which are directly screwed into the valve.
Observe the tightening torque information by the pipe fitting manufacturer.
CAUTION!
Faulty assembly! Exchanging P and T or X and Y (with external versions)
may cause damage at the valve in case of pressurization!
▶
Check whether at the threaded connections of the valve, the pressure connecting
line is connected to P and, if applicable, to X. Check whether at the threaded
connections of the valve, the return line is connected to T and, if applicable, to Y.
