Burkert 20149691 (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, meaning additional actuation modules are not necessary. The motor does not need any energy to maintain a certain valve opening, which can dramatically reduce the energy consumption of a plant and make it more efficient. The 20149691 model specifically features a 1/2" G threaded brass body, FKM seals, a 0-6 bar pressure range, and an integrated positioner.

Key Features:

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

General Technical Data

Property	Value
Seal Material	FKM for neutral gases (NBR and EPDM available for other variants)
Valve Body	Brass (Stainless steel available for other variants)
Orifice	DN 8...DN 15, NPS 1/4, 3/8, 1/2
Flow Direction	Against closing direction (below seat)
Design	Globe control valve
Weight	~0.7 kg
Controller Variant	Position controller (Standard on/off and process controller available)
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)
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)
Medium Temperature	FKM, NBR: 0 °C...+70 °C (EPDM: -30 °C...+70 °C)
Ambient Temperature	-10 °C...+60 °C
Degree of Protection	IP54

Material Specifications

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	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

Note: Dimensions in mm.

Performance Specifications

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

Duty Cycle Limits

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.

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.

The two end positions of the valve are indicated by the LED status. In addition, the actual position recorded by the position sensor is output via the M12 circular plug-in connector.