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Technical data
Type 3281
6.5.1 Derating
The maximum duty cycle of the valve depends on the maximum
ambient temperatures, the media temperature and the coil current
of the stepper motor.
The duty cycle does not mean the duty cycle of the device
but the duty cycle of the stepper motor.
From the derating curve it can be read which maximum duty cycle
is permissible at which maximum ambient temperature.
10 %
20 %
30 %
40 %
50 %
60 %
70 %
80 %
90 %
100 %
0 5 10 15 20 25 30 35 40 45 50 55 60
Ambient temperature [°C]
Duty
cycle
[%]
Fig. 3: Derating curve at max. media temperature for positioner and
process controllers
6.6 Mechanical data
Materials
Actuator cover Plastic parts black: PPS GF40,
Plastic parts anthracite: PC GF10
Valve body Stainless steel VA
Seal material PTFE
Other materials in
the fluid sector Stainless steel VA
Connections G1/2, RC1/2, NPT1/2
Weight see data sheet
Dimensions see data sheet
6.7 Fluidic data
Seat
diameter
KV
s-value
[m³/h]
3)
Max. pressure [bar]
4 0.57
See indication on the type
label
6 1.25
8 1.8
10 2.25
3)
The KV
s
value is a flow value for water, measurement at +20 °C and
1 bar pressure difference above the fully open valve.
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