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Contact with salt water leads to increased corrosion at the valve. This may
chemically corrode and damage individual valve mounting and plug screws.
So take suitable corrosion protection measures.
2.7 notices on the valve use
Observe the following information during project planning:
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Special application conditions for safe use include that in case of valves with two
solenoids, maximally one solenoid is operated at a time in all operating states.
The simultaneous operation of both solenoids leads to malfunctions, excessive
heating and will result in loss of explosion protection.
▶
Be aware of possible pressure intensification if the valve is connected to the
chamber on the piston rod side of a differential cylinder. If the outflow of the
hydraulic fluid from this chamber is obstructed, pressure on the cylinder may
result in a pressure intensification that may damage cylinder chamber, supply
line, and valve.
▶
To ensure proper functioning, care must be taken that the pressure chamber of
the valve solenoid is always filled with hydraulic fluid and the tank line must not
be allowed to run empty. With corresponding installation conditions, a preload
valve providing a preload pressure of approx. 2 bar must be installed in the
tank line.
▶
Due to the inductive effect, the abrupt switch-off of the valve solenoid results in
a voltage peak. As interference protection circuit, the valve solenoid coil already
contains a suppressor diode with 47 V breakdown voltage dampening these
voltage peaks. However, additional external switching measures have to be taken
to avoid connected electric circuits being influenced by the remaining residual
voltage peak, if required.
▶
In order to control the valve, an analog direct current signal or a pulse-width
modulated (PWM) signal with 160...500 Hz and a maximum pulse voltage of 28 V
is required.
Safety instructions
RE 29184-XE-B/04.16, 3DREP 6../..XE, Bosch Rexroth AG
13/48
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