Burkert 20032576 (Type 3281) is a direct-acting electromotive 2-way globe proportional valve designed to control the flow of neutral liquid and gaseous media in closed or open control loops. The valve is driven by a linear stepper motor that converts rotary movement into linear movement via a threaded spindle. The integrated control electronics eliminate the need for external motor control modules. The motor requires no energy to maintain a specific valve opening, which reduces overall plant energy consumption. The 20032576 variant features an integrated positioner, a G 1/2" port connection, an 8 mm seat, and operates within a 0 to 12 bar pressure range using a 4-20 mA input signal.

General Technical Data

Feature	Specification
Orifice	DN 15, NPS 1/2
Design	Globe: on/off valve or control valve
Dead band of position control	±0.5% (corresponds to setting range 1:100)
Closing time	2.5 s
Operating pressure	0 to 16 bar(g) (depending on seat size)
Duty cycle	Up to 100% (depending on medium and ambient temperature)
Nominal pressure	PN 25 (DIN EN 1333)
Seat leakage	Class VI (DIN EN 60534-4)
Operating voltage	24 V DC ± 10% (max. residual ripple 10%)
Power consumption	< 1 W holding power; Max. 12 W (short term 20 W)
Medium temperature	-20 °C to +130 °C
Ambient temperature	-10 °C to +60 °C

Materials

No.	Element	Material
1	Housing cover	PC (Polycarbonate)
2	Housing base	PPS (Polyphenylenesulfide)
8	Spindle seal	PTFE (filled)/FKM, with spring compensation
13	Seat seal	PTFE sealing washer
15	Valve body	Stainless steel CF3M/316L

Dimensions

INFO

Dimensions are in mm. Twisting of the actuator housing is possible.

Actuator

Threaded Variant

DN	NPS	G	NPT	RC	LM	AF
15	1/2	14	13.7	13.2	65	27

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 moves. Frequent set-point value changes drastically increase the duty cycle of the motor.

Pressure Range (Standard Variant)

Valve function	Seat size	Controller variant	Port connection	Kvs value [m³/h]	Pressure range [bar(g)]
Control	4	Control	G 1/2	0.57	0 to 16
Control	6	Control	G 1/2	1.25	0 to 16
Control	8	Control	G 1/2	1.8	0 to 12
Control	10	Control	G 1/2	2.25	0 to 7
On/off	15	On/off	G 1/2	4.45	0 to 3.5

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 sensor records the current position (POS) of the electromotive valve. This actual position is compared by the positioner with the set-point value (CMD). If there is a control difference, a motor control signal is given to the actuator as the actuating variable.

Process Controller Variant The additionally implemented PID controller can perform process control in the sense of a cascade control. The position setpoint of the valve is calculated from the process setpoint and the actual process value via the control parameters. The process setpoint can be specified by an external signal.