The BURKERT 3280 direct-acting electromotive 2-way globe proportional valve is 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 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 an integrated positioner, and as a variant with an integrated process controller.

• 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

Structure and Function

The valve spindle is driven by a stepper motor. The angular movement of the motor is converted to translational movement with the aid of a threaded spindle. The valve spindle is connected rigidly to the threaded spindle. The valve spindle is connected to a control cone.

General Technical Data

Product Properties	Description
Seal	NBR for liquids EPDM for liquids and special gases (e.g. ammonia, acetylene) FKM for neutral gases PEEK (for seat sizes 1 and 1.5)
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
Controller variant	Standard on/off, standard control valve, position controller or process controller
Operating pressure	0...6 bar(g) High pressure variant up to 22 bar(g) optionally available Vacuum variant up to -0.9 bar(g) optionally available
Duty cycle	Up to 100% (depending on medium and ambient temperature)
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, as well as high-pressure variants)
Medium temperature	EPDM: -30 °C...+70 °C FKM, NBR: 0 °C...+70 °C
Degree of protection	IP54
Ambient temperature	-10 °C...+60 °C (Max +50 °C for high-pressure variant and seat size 8/10 mm)

Electrical Control and Interfaces

Technical data	Standard (On/off)	Standard (Control valve)	Positioner (Analogue)	Process controller (Analogue)
Input signal (set-point)	Digital input: 0...5 V (log. 0) or 10...30 V (log. 1)	4...20 mA, 0...10 V or PWM	4...20 mA, 0...20 mA, 0...10 V or 0...5 V	4...20 mA, 0...20 mA, 0...10 V or 0...5 V
Input signal (actual value)	-	-	-	4...20 mA, 0...20 mA, 0...10 V or 0...5 V
Output signal (actual value)	Digital output: PNP, max. 100 mA	Digital output: PNP, max. 100 mA	0/4...20 mA, 0...5/10 V	0/4...20 mA, 0...5/10 V
Fieldbus interface	-	-	büS/CANopen (Digital variant)	büS/CANopen (Digital variant)

INFO

The standard control valve variant is a proportional valve which, like the positioner variant, changes the valve stroke continuously depending on the input signal. This variant has no büS interface and no analogue output signal.

Materials

• Housing cover: PC (Polycarbonate)
• Housing base: PPS (Polyphenylenesulfide)
• Spindle seal: FKM/EPDM/NBR
• Spindle: Stainless steel 1.4305
• Valve body: Brass or stainless steel AISI 316L
• Seat: Stainless steel 1.4301/1.4305

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

Performance Specifications

Duty Cycle Derating

WARNING

The duty cycle is an important factor for motor valves. The self-heating of the engine limits the maximum duty cycle. High ambient temperatures additionally increase the risk of damage due to overheating. Operating the valve outside the recommended duty cycle limits will result in a significantly reduced service life of the valve.

The duty cycle does not mean the duty cycle of the device but the duty cycle of the motor. This is only switched on when the valve is to move. Frequent set-point value changes drastically increase the duty cycle of the motor.

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

Pressure Range (High-Pressure Variant)

TIP

For applications requiring a higher operating pressure, high-pressure variants are available. Please note that for the high-pressure variant, the control in the lower range of the characteristic curve (< 5% of the max. set point) can be impaired.

Valve function	Seat size	Port connection	Kvs-value [m³/h]	Pressure range fluid media [bar(g)]	Pressure range gaseous media [bar(g)]
Control valve, without safety position in case of power failure	1	G 1/4	0.030	0...15	0...22
	1.5	G 1/4	0.065	0...15	0...22
	2	G 3/8	0.130	0...15	0...22
	3	G 3/8	0.300	0...15	0...22
	4	G 3/8	0.500	0...12	0...12
	5	G 3/8	0.750	0...12	0...12
	6	G 3/8	0.900	0...15	0...16
	8	G 1/2	1.500	0...12	0...12
	10	G 1/2	1.900	0...10	0...10

Product Operation

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.

Safety Instructions

DANGER

Risk of injury from high pressure in the system or device. Before working on the system or device, cut off the pressure and deaerate/drain lines.

Risk of injury due to electrical shock. Before working on the system or device, switch off and isolate the power supply to prevent reactivation of the device. Observe applicable accident prevention and safety regulations for electrical equipment.

WARNING

Electrostatic sensitive components and modules! The device contains electronic components which react sensitively to electrostatic discharge (ESD). Contact with electrostatically charged persons or objects are hazardous to these components. Do not touch electronic components while the supply voltage is switched on!