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7.8 Assembly of valves for subplate mounting
Faulty fastening of the safety valve!
Mounting of the safety valve using valve mounting screws of reduced stability
may cause the safety valve to become loose and lead to damage to persons and
property!
For reasons of stability, only valve mounting screws according to table 11
f
or of comparable quality (dimensions, property class) may be used. Screw
dimensions, property classes and tightening torques depend on the valve type
and the size.
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.
Insufficient design of the subplate!
The safe pressure relief function does no longer work if material and dimensions of
the subplate have been incorrectly designed.
Material and dimensions of the subplate are to be selected so that sufficient
f
safety is provided for all imaginable operating conditions. This for example
applies to pressure resistance, the resistance to stripping of the connection
threads and the resistance to stripping of the threads of the valve mounting
screws.
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.
Remove the protective cover from the valve.
2.
Prior to assembly, check whether the seals are placed into the connection
counterbores of the safety valve and are not damaged. If required, retrofit any
missing seals.
3.
Carefully place the valve on the valve installation surface. Observe the position of
the connections.
4.
Ensure that the valve mounting screws are tightened using the specified
tightening torque. Tighten them crosswise using a suitable manual torque wrench.
For the tightening torques, please refer to the table further down.
5.
Please note that the tightening torques may change if other screw types are used.
WARNING
RE 25402-B/10.21, DBD...1X/..E, Bosch Rexroth AG
Assembly
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