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Contact with salt water leads to increased corrosion at the valve. This may
chemically corrode and damage individual components of the valve.
You should thus 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.
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To ensure proper functioning, the valve must be bled.
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Pressure peaks in the joint return line of more than one valve may cause
unintended movements of the control spool and thus unintended switching
processes. This particularly holds true when valves with detent are used. It is
recommended to use separate return lines.
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If due to the operating conditions to be expected during the switching processes,
flows have to be anticipated that exceed the performance limits of the valve
that can be seen from the characteristic curve, a throttle insert must be used in
channel P for flow limitation.
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The performance limit specified in "Data sheet 23178-VP1" only applies in case
of two flows in opposite directions (e.g. flow from P to A and simultaneous
return flow from B to T). Due to the flow forces acting within the valves, the
performance limit may be considerably lower in applications with only one flow.
▶
In the case of valves with symbol A and B (see "Data sheet 23178-VP1"), port T
must be used as leakage oil connection if the operating pressure exceeds the
permissible tank pressure.
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Ports P, A and B with a 3/2 directional valve or ports P, A, B and T with a 4/2 and
4/3 directional valve are clearly assigned according to their function and must not
be arbitrarily exchanged or plugged. The flow is only admissible in the direction
of the arrow specified in "Data sheet 23178-VP1".
▶
Switching off the valve solenoid results in a voltage peak due to the inductive
effect. The valve solenoid already contains an interference protection circuit
dampening this voltage peak. However, additional external switching measures
have to be taken, if required, to avoid an influence of the residual voltage peak on
connected electric circuits. The values for the residual voltage peak depend on
the valve solenoid used, see "Data sheet 23178-VP1".
Safety instructions
RE23178-VP1-B/06.16, WE 6../.B..VP1..., Bosch Rexroth AG
13/48
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