The BURKERT 20120591 Type 3361 is an electromotive 2-way globe control valve designed for demanding operating conditions. The electromotive actuator utilizes a ball screw to position the control cone, achieving a positioning speed of up to 6 mm/s for delay-free reaction to process signals. The specific 20120591 configuration features a 1/2" G internal thread connection, an AG2 actuator with 1300 N driving force, and an integrated positioner. It operates on a 24 V DC supply voltage and handles medium pressures from 0 to 40 bar and temperatures from -10 °C to +185 °C. The closed design and powder-coated aluminum/PPS housing provide IP65/IP67 and NEMA 4X protection, ensuring resistance to weather, impact, and vibration.

General Technical Data

Property	Specification
Design	Globe control valve
Nominal diameter	DN 15 (1/2")
Safety setting (power failure)	Normally closed (delivery status), with electrical energy storage
Flow direction	Against closing direction (below seat)
Controller variant	Positioner
Operating pressure	0 to 40 bar(g)
Nominal pressure	PN 40 (DIN EN 1333), Class 150 (DIN EN 1759)
Kv value (water)	0.2 m³/h
Closing time	3.400 ms (typical)
Operating voltage	24 V DC ± 10 % (maximum residual ripple 10 %)
Operating current	Maximum 3 A (at maximum load including 1 A charging current for SAFEPOS)
Medium temperature	-10 °C to +185 °C
Ambient temperature	-25 °C to +65 °C
Degree of protection	IP65/IP67 (DIN EN 60529), NEMA 4X

INFO

All electrical values relate to a supply voltage of 24 V at +25 °C. The maximum permissible temperature for the environment and the medium are dependent on each other.

Approvals and Conformities

The 20120591 configuration includes food and beverage compliance. All wetted materials are compliant with EC Regulation 1935/2004/EC according to the manufacturer's declaration.

Materials

Component	Material
Display housing/blind cover	PPS (standard)
Actuator cover	PPS
Actuator housing	Powder-coated aluminium
Actuator base	PPS
Valve body	Stainless steel CF3M
Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
Spindle seal	PTFE V-seals (filled) with spring compensation
Seat seal	Stainless steel
Control cone	Stainless steel 1.4571

Dimensions

Actuator (AG2)

For the DN 15 (1/2") port connection, the standard variant height (H1) is 417 mm. Dimensions without sealing function: the actuator is raised by approx. 2 mm in the closed position.

Body with Threaded Connection

DN	NPS	G	D	E	LM	AF
15	1/2	14	13.7	13.2	65	27

Product Design and Assembly

The electromotive linear drive consists of a brushless DC motor, a gear, and a spindle system that transfers the force to the closing element. The integrated electronics are controlled by standard analogue signals. The electromotive linear actuator is designed to provide optimum efficiency and keeps the valve tight and in position even at the maximum specified medium pressure in a powerless standstill.

Integrated Position Controller

The position of the actuator (stroke) is controlled according to the position set-point value specified by an external standard signal. The displacement transducer records the actual position (POS) of the electric linear actuator. The positioner compares the actual position value with the position set-point value (CMD). If there is a system deviation, the electric motor drive is controlled via the actuating variable CTRL and the actual position value is changed accordingly.

TIP

The valve position can be changed manually in two ways: via the electrical manual control or via a mechanical manual override if no supply voltage is available.