BURKERT 329206 (Type 3280) is a direct-acting electromotive 2-way globe proportional valve suitable for dosing liquids and gases in closed or open control loops. The valve is driven by a linear stepper motor. The integrated electronics assembly simplifies the process integration; additional actuation modules are not necessary. The engine does not need any energy to maintain a certain valve opening. This feature can reduce the energy consumption of a plant dramatically and therefore make it more efficient. Type 3280 is available as an on/off valve or proportional valve by default, as a variant with integrated positioner, and as a variant with integrated process controller.

INFO

The operating instructions and some shared specifications also apply to the Type 3285 electromotive 2-way disk valve.

• Actuator is not wetted
• Excellent setting range and fast reaction time
• Low electrical power consumption
• Connection orifice DN 8...15
• Variants: standard, positioner, process controller and high-pressure variants for up to 22 bar

General Technical Data

Product properties
Seal	NBR for liquids EPDM for liquids and special gases (e. g. ammonia, acetylene) FKM for neutral gases
Valve body	Brass, stainless steel
Orifice	DN 8...DN 15, NPS 1/4, 3/8, 1/2
Flow direction	Against closing direction (below seat)
Design	Globe on/off valve Globe control valve
Weight	~0.7 kg
Controller variant	Standard on/off, standard control valve, position controller or process controller
Safety setting in case of power failure	With capacitive buffer module as accessory

Performance data
Dead band of the position control	±0.5% (corresponds to setting range 1:100)
Closing time	2.5 s
Operating pressure	0...6 bar(g) (High pressure variant up to 22 bar(g) optionally available)
Duty cycle	Up to 100% (depending on medium and ambient temperature)
Kvs value	0.03...1.9 m³/h

Electrical data
Operating voltage	24 V DC ± 10% (max. residual ripple 10%)
Power consumption	<1 W in holding position Max. 8 W (DN 2...DN 6) resp. max. 12 W (DN 8 and DN 10)

Materials

Actuator

No.	Element	Material
1	Housing cover	PC (Polycarbonate)
2	Housing base	PPS (Polyphenylenesulfide)

Valve body

No.	Element	Material
3	Spindle seal	FKM/EPDM/NBR
4	Spindel	Stainless steel 1.4305
5	Upper valve body	Brass or stainless steel 1.4305
6	Piston with parabolic control element and guiding shaft	PTFE / Stainless steel 1.4305
7	Elastomer seat seal	FKM/EPDM/NBR
8	O-ring	FKM/EPDM/NBR
9	Seat	Stainless steel 1.4301/1.4305
10	Valve body	Brass or stainless steel AISI 316L

Dimensions

Threaded Variant

A	B	C	D	E	F	G	H
-	-	12	G 3/8	97.4	137.2	12	27.5
6	10.3	-	NPT 3/8	97.4	137.2	12	27.5
-	-	12	G 1/4	96.4	134.2	10	27.5
5.8	10	-	NPT 1/4	96.4	134.2	10	27.5
-	-	14	G 1/2	97.4	139.2	14	29.5
8.2	13.7	-	NPT 1/2	97.4	139.2	14	29.5

Product Connections

Pin Assignment Analogue

Pin	Configuration
1	24 V DC
2	Power supply GND
3	Internal use
4	Internal use
5	Internal use
6	Signal input +
7	Signal output
8	Signal GND

Performance Specifications

Duty Cycle Derating Diagram

WARNING

Operating the valve outside the recommended duty cycle limits will result in a significantly reduced service life of the valve.

Pressure Range (Standard Variant)

Valve function	Seat size	Port connection	Kvs-value [m³/h]	Pressure range [bar(g)]
Control valve, without safety position in case of power failure	1	G 1/4	0.030	0...6
	1.5	G 1/4	0.065	0...6
	2	G 1/4	0.130	0...6
	3	G 1/4	0.300	0...6
	4	G 3/8	0.500	0...6
	5	G 3/8	0.750	0...6
	6	G 3/8	0.900	0...6
	8	G 1/2	1.500	0...6
	10	G 1/2	1.900	0...6

Product Operation

Process Diagram

Positioner variant The proportional valve in the position control variant converts an external standard signal, the position set-point value, into a valve position. The position of the actuator is controlled according to the set-point position. The position sensor records the current position (POS) of the electromotive valve. This actual position is compared by the positioner with the set-point value (CMD) specified as the standard signal. If there is a control difference (Xd1), a motor control signal is given to the actuator as the actuating variable. Z1 is a disturbance value.

Process controller variant 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 into a control loop. The position setpoint of the valve is calculated from the process setpoint and the actual process value via the control parameters (PID controller). The process setpoint can be specified by an external signal.