The BURKERT 320455 (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 process integration, eliminating the need for additional actuation modules. The motor does not require energy to maintain a specific valve opening, which can dramatically reduce the energy consumption of a plant and improve overall efficiency.

• Actuator is not wetted by the medium
• Excellent setting range and fast reaction time
• Low electrical power consumption
• Connection orifice DN 8...15

General Technical Data

Property	Value
Seal Material	PEEK / FKM
Valve Body	Brass, stainless steel
Flow Direction	Against closing direction (below seat)
Design	Globe control valve
Weight	~0.7 kg
Operating Pressure	0...6 bar(g)
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)
Operating Medium	Neutral gases and liquids
Medium Temperature	FKM: 0 °C...+70 °C
Viscosity	Max. 600 mm²/s (cSt)
Port Connection	Threaded connection G 1/4"
Degree of Protection	IP54
Ambient Temperature	-10 °C...+60 °C

Materials

No.	Element	Material
1	Housing cover	PC (Polycarbonate)
2	Housing base	PPS (Polyphenylenesulfide)
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	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 1/4	96.4	134.2	10	27.5
5.8	10	-	NPT 1/4	96.4	134.2	10	27.5
-	-	12	G 3/8	97.4	137.2	12	27.5
6	10.3	-	NPT 3/8	97.4	137.2	12	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

Operating the valve outside the recommended duty cycle limits will result in a significantly reduced service life of the valve. The duty cycle refers to the motor, which is only switched on when the valve is moving. 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

Flow Characteristic

TIP

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

Product Operation

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.

Electrical Connection

Pin assignment analogue (Circular plug M12, 8-pin)

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