Data Sheet

3285
5/8
Electrical control
Standard Control Valve
The standard proportional valve converts an external standard signal (position set-point value) into a valve position. Both valve end positions are
indicated by the LED status. Additionally, the digital output indicates when the “closed” valve position has been achieved.
Positioner version
The positioner proportional valve converts an external standard sig-
nal (position set-point value) into a valve position. The position of the
actuator is controlled according to the position set-point value. The
current position (POS) of the electromotive valve is recorded by the
position measuring system. The position controller compares this posi-
tion actual value to the set-point value (CMD) specied as the standard
signal. In case of a control dierence (Xd1), the motor control signal
is sent to the actuating drive as the actuating variable. Z1 is a distur-
bance value. Both valve end positions are indicated by the LED status.
Moreover, the position actual value recorded using the position meas-
uring system is output via the M12 circular plug-in connector.
Ventilöffnung
Elektro-
motorischer
Antrieb
Wegaufnehmer
Stellungs-
regler
Stellungs-
sollwert
CMD Xd1
CTRL
POS
Z1
POS
Stellungsregelkreis
+
-
Ventilgehäuse
Prozess-
regler
Stellungs
-
regelkreis
SP
CMD
Z2
PV
Prozessgröße
+
Xd2
-
Transmitter
Prozess
Prozess-
Sollwert
Ventil
-
öffnung
Process controller version
The additionally implemented PID controller can perform not only the
actual position control but also a process control in the sense of a
cascade control. The process controller is integrated in a control cir-
cuit.
The position set-point value of the valve is calculated from the process
set-point value and the process actual value using the control param-
eters (PID controller). The process set-point value can be specied
by an external signal. During the process control the position control
mentioned above becomes the subordinate auxiliary control circuit;
this results in a cascade control. The process controller in the main
control circuit has a PID function.
The process set-point value (SP) is specied as a set-point value and
is compared with the actual value (PV) of the process variable to be
controlled. The position measuring system records the current position
(POS) of the electromotive linear actuator. This position actual value
is compared by the position controller with the set-point value (CMD)
specied by the process controller. If there is a control dierence (Xd2),
the actual position (POS) and therefore the valve opening are changed
by the control variable (CTRL). Z2 represents a disturbance variable.
Standard On/O valve
In the ON / OFF version, an external voltage signal is digitized and the valve is closed or opened. The status of the two end positions of the valve are
indicated on the LED. In addition, the valve position “closed” is reached via the digital output.
Valve
function
Orice
[mm]
Port
Connection
7)
K
VS
value
water
[m³/h]
8)
Nominal
pressure
[barg]
9)
Control valve, with-
out safety position
in case of power
failure
8
G ½
1.8
6
10 G ½ 2.5 6
12 G ¾ 3.9 6
15 G ¾ 5.4 6
20 G 1 8.1 6
25 G 1 9.6 6
Versions
Please use the product lter of our eShop on the Bürkert website to order from the standard program. Alternatively, the form can be used at
the end of the data sheet.
7)
Other cable connections (NPT, sub-base) on request.
8)
K
VS
value: Flow rate for water, measured at + 20 °C and 1 bar pressure dierence across the fully opened valve.
9)
Fuel gases may vary
Ventilöffnung
Elektro-
motorischer
Antrieb
Wegaufnehmer
Stellungs-
regler
Stellungs-
sollwert
CMD Xd1
CTRL
POS
Z1
POS
Stellungsregelkreis
+
-
Ventilgehäuse
Prozess-
regler
Stellungs
-
regelkreis
SP
CMD
Z2
PV
Prozessgröße
+
Xd2
-
Transmitter
Prozess
Prozess-
Sollwert
Ventil
-
öffnung
Ventilöffnung
Elektro-
motorischer
Antrieb
Wegaufnehmer
Stellungs-
regler
Stellungs-
sollwert
CMD Xd1
CTRL
POS
Z1
POS
Stellungsregelkreis
+
-
Ventilgehäuse
Prozess-
regler
Stellungs
-
regelkreis
SP
CMD
Z2
PV
Prozessgröße
+
Xd2
-
Transmitter
Prozess
Prozess-
Sollwert
Ventil
-
öffnung
Analytical
Oxygen version
Parts oil-, fat- and silicon free
Further versions on request
i
Approvals
cURus