The Bürkert 20046543 (Type 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, eliminating the need for additional actuation modules. The motor does not consume energy to maintain a specific valve opening, which can dramatically reduce the energy consumption of a plant and improve overall efficiency. The Type 3280 is available as a standard on/off or proportional valve, as well as variants with an integrated positioner or process controller.

• Actuator is not wetted by the medium
• 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

1. General Technical Data

Product Properties	Description
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
Status display	LED

Performance Data

Characteristic	Value
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 Vacuum variant up to -0.9 bar(g) optionally available
Duty cycle	Up to 100% (depending on medium and ambient temperature)
Kvs value	0.03...1.9 m³/h

Electrical and Medium Data

Characteristic	Value
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)
Operating medium	Neutral gases and liquids
Medium temperature	EPDM: -30 °C...+70 °C FKM, NBR: 0 °C...+70 °C
Viscosity	Max. 600 mm²/s (cSt)
Ambient temperature	-10 °C...+60 °C

2. Materials

Note

The globe control valve Type 3280 is supplied with various port connections. These connections are not shown completely. However, they correspond to the material of the valve housing.

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	Spindle	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

3. Dimensions

3.1 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

3.2 Sub-base Variant

3.3 Cartridge Variant

4. Performance Specifications

4.1 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. 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.

4.2 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

4.3 Flow Characteristic

Recommendation

The dimensioning of the seat size is very important for electromotive proportional valves to function properly within the application. The seat size must be selected so that the desired flow range is achieved and, when the valve is fully open, a sufficient portion of the total pressure drop occurs across the valve. Reference value: Δp valve > 25% of the total pressure drop.

5. Product Operation

Standard on/off valve In the on/off variant, 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.

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 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.

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.