bürkert 2821 Betriebsanleitung Seite 30

NOTE
ATTENTION!
Operating Instructions-No. 803 037
With valve types 6021, 6022, 6023, 2821, 2832, 2834 and 2836,
the current value I for the start of opening of the valve reduces
1
with increasing pre-pressure;
The current value I for the full opening of the valve decreases
2
with increasing pressure drop across the valve.
In the servo-assisted valve Type 6223, the current value I
start of opening of the valve increases with increasing pre-
pressure;
The current value I for the full opening of the valve increases
2
with increasing pressure drop across the valve.
The valve will not be damaged if a higher coil current than the
value I given in the right-hand column of the table is set with a
2
maximum control signal. It will, however, cause little or no
increase in the flow rate , and will impair the linearity of the
characteristic.
In continuous use, it is possible that this increased current value
cannot be maintained by the current regulator, as a result of the
resistance increase resulting from the warming of the coil.
for the
1
23