BURKERT 20072839 Type 3361 is an electromotive 2-way globe control valve engineered for demanding process automation and dynamic continuous flow control. Configured under article number 20072839, the assembly combines a cast stainless steel CF3M globe body with an AG2 electromotive linear actuator delivering 1300 N positioning force. Process connection is provided via DN 15 flanges according to DIN EN 1092-1 with a nominal pressure rating of PN 25 (Class 150). The valve trim features an exchangeable stainless steel seat with a 6 mm (1/4") orifice and a linear 25:1 control cone delivering a water flow coefficient Kv of 1.2 m³/h (Cv 1.4 gpm).

Actuation is driven by a 24 V DC brushless motor paired with a precision ball screw, achieving a linear travel speed of 6 mm/s and typical closing times of 3.4 s. The unit includes the integrated SAFEPOS energy-pack emergency electrical storage module, ensuring the valve drives to its safety position (normally opened in factory delivery status) upon power failure. Digital parameterization and local operation are handled through a rugged display module with operating keys, complemented by analogue control inputs and outputs as well as a digital Service-büS communication interface.

Technical Specifications (Article 20072839)

Attribute	Specification Value
Article Number	20072839
Valve Type	Type 3361 (2-way globe control valve)
Nominal Diameter	DN 15 (NPS 1/2)
Process Connection	Flange DIN EN 1092-1 PN 25 (Class 150)
Operating Pressure Range	0.00 to 25.00 bar(g)
Medium Temperature Range	-10 °C to +185 °C
Ambient Temperature Range	-25 °C to +65 °C (subject to display/module derating)
Seat Diameter	6 mm (1/4")
Flow Capacity	Kv 1.2 m³/h (water) / Cv 1.4 gpm
Control Cone Characteristic	Linear 25:1
Flow Direction	Below seat (against closing direction)
Valve Seat Seal	Stainless steel 1.4571 (leakage Class IV, DIN EN 60534-4)
Body Material	Cast stainless steel CF3M
Actuator Size & Thrust	Size AG2 (1300 N nominal driving force)
Travel Speed	6 mm/s
Typical Closing Time	3.4 s (AG2 range: 3.3 to 6.6 s)
Supply Voltage	24 V DC ±10 % (maximum residual ripple 10 %)
Current Consumption	AG2 max. 3 A (including 1 A SAFEPOS charging current)
Control Function	Normally Opened (NO, delivery status) via energy storage
Local Interface	Rugged display module with operation keys
Signals & Bus	1 analogue input, 1 digital input, 1 analogue output, 2 digital outputs, Service-büS
Ingress Protection	IP65 / IP67 (DIN EN 60529), NEMA 4X
Conformity	Food (EC) 1935/2004 compliant, Ecolab detergent resistant

General Technical Data

Type 3361 actuators are divided into size AG2 (1300 N or 2500 N thrust for seat sizes 3 to 50 mm) and size AG3 (7700 N or 10000 N thrust for seat sizes 40 to 100 mm). Total weight reaches up to 5.5 kg for AG2 and 16 kg for AG3, excluding valve body options. The electric drive maintains zero-power holding tightness against maximum medium pressure in standby conditions, drawing 2 to 5 W.

Position control operates with a dead band of ±0.1 %. The standard duty cycle rating is 100 %. Permissible fluid viscosity spans up to 600 mm²/s across neutral gases, steam, water, alcohols, fuels, hydraulic fluids, salt solutions, and organic solvents. The device can be installed in any orientation, with upright actuator placement preferred.

Approvals and Standards

The wetted materials in article 20072839 comply with Regulation (EC) 1935/2004 according to the manufacturer declaration and meet Ecolab test method F&E/P3-E No. 40-1 for external washdown detergent resistance. Across the broader Type 3361 range, conformity options include:

• Explosion Protection: ATEX BVS 17 ATEX E 117 X and IECEx BVS 17.0100X (II 3G Ex ec IIC T4 Gc, II 3D Ex tc IIIC T135 °C Dc) for Zone 2/22 (variable code PX48).
• North America: UL Listed for USA and Canada to UL 61010-1 and CAN/CSA-C22.2 No. 61010-1 (code PU11).
• Drinking Water: Compliance with UBA evaluation criteria up to +85 °C (code PF39).
• Food and Pharmaceutical: FDA Code of Federal Regulations (PL02/PL03), USP Class VI biocompatibility (PL04), and China Food GB standards (PL10).
• Gas Media: Suitability declarations for gaseous oxygen up to 25 bar(g) and +60 °C (NL02) and gaseous hydrogen up to 40 bar(g) and +100 °C (NG18).
• Fugitive Emissions: TA Luft compliance (code PM01).

Materials of Construction

Actuator Material Specifications (AG2)

Item	Component	Standard Material
1	Display housing / blind cover	PPS (standard), stainless steel 1.4301 (ATEX/IECEx)
2	Actuator cover	PPS
3	Seal	EPDM
4	Actuator housing	Powder-coated aluminium
6	Seal	EPDM
7	Actuator base	PPS

Valve Body and Fluidic Wetted Materials

Item	Component	Material
1	Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
2	Spindle seal	PTFE V-seals (filled) with spring compensation
3	Spindle guide	Stainless steel 1.4404 (316L)
4	Packing gland tube	Stainless steel 1.4401 (316)
5	Seal valve body	Graphite or PTFE
6	Seat seal	Stainless steel 1.4571 (configured on 20072839), PTFE, or PEEK
7	Control cone	Stainless steel 1.4571 (optionally hardened)
8	Valve seat	Stainless steel 1.4571 (optionally hardened)
9	O-ring valve seat	EPDM or PTFE (seat size ≥ 25 mm)
10	Valve body	Stainless steel CF3M

Dimensions

AG2 Actuator Height Dimensions

Dimensions in mm. Heights are given for standard variants (H1) and fieldbus gateway variants (H2). The actuator rises approximately 2 mm in the closed position when seating without compression.

DN	NPS	H1 Standard Variant [mm]	H2 Fieldbus Variant [mm]
10	3/8	417	489
15	1/2	417	489
20	3/4	423	495
25	1	446	518
32	1 1/4	474	546
40	1 1/2	479	551
50	2	485	557

Flange Connection Dimensions (DIN EN 1092-1 PN 25 FTF 1 / DIN EN 558-1)

DN	∅ DF [mm]	LF [mm]	∅ BF [mm]	AF [mm]	∅ D [mm]	Bolt Holes (A x α)	∅ MF [mm]
10	90	130	60	16	14	4 × 90°	13.6
15	95	130	65	16	14	4 × 90°	18.1
20	105	150	75	18	14	4 × 90°	23.7
25	115	160	85	18	14	4 × 90°	29.7
32	140	180	100	18	18	4 × 90°	38.4
40	150	200	110	18	18	4 × 90°	44.3
50	165	230	125	20	18	4 × 90°	56.3
65	185	290	145	22	18	8 × 45°	66.0
80	200	310	160	24	18	8 × 45°	81.0
100	235	350	190	24	22	8 × 45°	100.0

Electrical Connections and Pin Assignment

Article 20072839 uses M12 circular connectors on the AG2 actuator base:

• X3 Connector: M12 plug, 5-pin, A-coded for 24 V DC supply and büS/CANopen.
• X1 Connector: M12 plug, 8-pin, A-coded for analogue/digital set-point and feedback signals.
• X2 Socket: M12 socket, 5-pin, A-coded for process controller actual value sensor connection (available on process controller models).

Pin Assignment Tables

Connector	Pin	Assignment
X3 (Power & büS)	1	CAN Shield / shield
M12 plug, 5-pin, A-coded	2	Operating voltage 24 V DC ±10 %
	3	GND / CAN_GND
	4	CAN_H
	5	CAN_L
X1 (I/O Signals)	1	Digital input +
M12 plug, 8-pin, A-coded	2	GND for digital input and digital outputs
	3	Digital output 2 + (PNP, max. 100 mA)
	4	Digital output 1 + (PNP, max. 100 mA)
	5	Analogue output - (0/4..20 mA or 0..5/10 V)
	6	Analogue output +
	7	Set-point value / Analogue input - (0/4..20 mA, input impedance 70 Ω; 0..5/10 V, 22 kΩ)
	8	Set-point value / Analogue input +
X2 (Process Actual)	1	Do not connect
M12 socket, 5-pin, A-coded	2	Do not connect
	3	Do not connect
	4	Process actual value 4..20 mA (input impedance 80 Ω, 12 bit)
	5	Process actual value GND

Fluidic Performance and Operating Limits

Type 3361 features an equal-percentage flow characteristic according to DIN EN 60534-2-4 as standard, with linear characteristics available on request. Article 20072839 is configured with a linear 25:1 cone on seat size 6 mm.

DN 15 Fluidic Data (Flow Below Seat)

Nominal diameter DN 15 (NPS 1/2) with AG2 actuator nominal force 1300 N:

Seat Size [mm]	Actuator Force [N]	Max Operating Pressure (Seat Leakage) [bar]	Rangeability	Kv at 5% Stroke [m³/h]	Kv at 10% Stroke [m³/h]	Kv at 30% Stroke [m³/h]	Kv at 50% Stroke [m³/h]	Kv at 70% Stroke [m³/h]	Kv at 100% Stroke (Kvs) [m³/h]
3	1300	25 (IV) / 40 (IV)	20:1	-	0.005	0.013	0.026	0.044	0.1
3	1300	25 (IV) / 40 (IV)	20:1	-	0.009	0.023	0.046	0.085	0.2
4	1300	25 (IV) / 40 (IV)	30:1	-	0.023	0.049	0.097	0.18	0.5
6 (20072839)	1300	25 (IV)	50:1	-	0.007	0.045	0.16	0.41	1.25 (linear cone: 1.2)
8	1300	25 (IV) / 40 (VI)	50:1	-	0.080	0.13	0.27	0.63	2.1
10	1300	25 (IV) / 40 (VI)	50:1	-	0.11	0.19	0.49	1.1	3.1
15	1300	25 (IV) / 40 (VI)	50:1	0.14	0.17	0.35	0.80	1.8	4.3

Seat Seal Temperature Limits

• Stainless Steel (1.4571): Medium temperature -40 °C to +230 °C. Seat leakage class III/IV (DIN EN 60534-4). Suitable for cavitation, wet steam erosion, and abrasive media.
• PTFE Soft Seal: Medium temperature -40 °C to +130 °C. Bubble-tight seat leakage class VI.
• PEEK Soft Seal: Medium temperature -10 °C to +230 °C. Seat leakage class VI for elevated temperatures.

Ambient Temperature Derating

For AG2 actuators fitted with a display module and the SAFEPOS energy-pack, maximum permissible ambient temperature is derated according to medium temperature. At medium temperatures up to +185 °C, ensure ambient conditions do not exceed +55 °C.

Product Assembly and Control Principle

The electromotive linear drive consists of a brushless DC motor, reduction gearing, and a precision spindle system that displaces the control cone. The displacement transducer continuously senses the actual position (POS) of the spindle. The position controller compares this feedback value against the set-point value (CMD). Any control deviation (Xd1) prompts motor actuation via variable CTRL until equilibrium is reached.

SAFEPOS Energy-Pack Emergency Reset

The internal SAFEPOS energy storage module supplies autonomous electrical energy to move the valve into a pre-programmed safety position if operating voltage fails. On article 20072839, the delivery setting is Normally Opened. The internal supercapacitors achieve full operating charge within 120 seconds after supply voltage restoration and provide an operational lifespan up to 10 years with automated state-of-health monitoring.

User Interface and Manual Override

• Display Module: Enables configuration, parameter setting, diagnostic readouts, and electrical manual operation via capacitive push buttons.
• 360° LED Light Ring: Emits status colors indicating valve position, maintenance demand, warnings, or device faults according to NAMUR NE 107 recommendations.
• Mechanical Manual Override: Located beneath the display/dummy cover. Engaging an Allen key (3 mm width across flats) allows manual adjustment in the de-energized state. Tightening torque must not exceed 2 Nm.

Mechanical Override Torque Limit

The mechanical manual override must only be actuated when power supply is switched off. Do not exceed the maximum permissible torque of 2 Nm when driving against the end stops, or the internal gearing mechanism will be damaged.

Maintenance and Service Procedures

Residual Pressure Hazard

Depressurize and drain or vent pipelines before dismantling the valve or loosening the body connection. Uncontrolled release of pressurized media can cause fatal or severe injuries.

Actuator Removal from Valve Body

1. Set operating state to MANUAL.
2. Move the valve into the open position (at least 1/3 open) to prevent damage to the valve seat and sealing faces.
3. Disconnect power supply and verify that the 360° LED ring is off.
4. Clamp the valve body in a holding fixture.
5. Apply an open-end wrench to the body connection hexagon and unscrew the actuator from the valve body.

Replacing the Control Cone

1. Support the cylindrical section of the control cone in a prism fixture.
2. Drive out the dowel pin using a 4 mm pin punch (for DN 10/15 spindle diameter 10 mm).
3. Remove the worn control cone.
4. Fit the replacement control cone onto the spindle, aligning the through-bores.
5. Support the assembly in the prism, drive in a new dowel pin with a hammer, and position it flush and centered in the spindle axis.

Replacing the Valve Seat

1. Insert the dedicated seat tool insert into installation tool 652604.
2. Unscrew the valve seat from the body cavity and blow out residual debris with clean dry compressed air.
3. Lubricate the threads of the new seat with Klüberpaste UH1 96-402.
4. Hand-thread the new seat into the body.
5. Tighten the valve seat using a torque wrench. For seat sizes 3 to 15 mm on DN 10/15 bodies, apply 20 Nm (+3 Nm tolerance).

Mounting Actuator to Body and Tightening Torques

Always fit a new graphite body seal gasket prior to assembly. Lubricate external body connection threads with Klüberpaste UH1 96-402. Thread the actuator onto the body with the valve spindle in the open position. Observe the prescribed tightening torques below.

Valve Body Connection [DN]	Body Tightening Torque [Nm]	Body Tightening Torque [lbf·ft]
10 / 15	45 ±3	33 ±2
20	50 ±3	37 ±2
25	60 ±3	44 ±2
32 / 40	65 ±3	48 ±2
50	70 ±3	52 ±2
65	100 ±3	74 ±2
80	120 ±5	89 ±2
100	150 ±5	111 ±2

Running X.TUNE Calibration

After remounting the actuator or replacing internal trim components, run the X.TUNE self-calibration function. The valve must be in an unpressurized pipeline. Never run X.TUNE under medium pressure, as this will distort the stroke limits and cause unstable closed-loop control.

To initiate X.TUNE from the local push buttons, press and hold both OPEN and CLOSE buttons under the cover for 5 seconds until the LED ring illuminates orange. Alternatively, trigger X.TUNE from the display menu under Configuration → Position Controller → Maintenance → Calibration → X.TUNE.

Spare Parts and Accessories

Item Description	Order / Article No.
SAFEPOS energy-pack replacement module (AG2)	285834
Packing gland seal set (spindle ø10 mm, DN 15/20)	285685
Stainless steel spindle guide (spindle ø10 mm, DN 15)	246577
Control cone set DN 15, seat 6 mm, steel/steel (includes dowel pin & graphite seal)	152696
Valve seat set DN 15, seat 6 mm, stainless steel (includes graphite seal)	262146
Valve seat installation tool (DN 15 body connection)	652604
Modified socket wrench SW19 for packing gland (DN 15)	683220
Body holding device fixture (DN 15 to DN 20)	693770
M12 circular socket with 5 m cable, 4-pin, A-coded (X3 power supply)	918038
M12 circular socket with 2 m cable, 8-pin, A-coded (X1 I/O signals)	919061
M12 circular plug with 2 m cable, 5-pin, shielded (X2 process sensor)	559177
USB-büS interface set 1 (Type 8923 stick, cables, power supply)	772426
büS adapter cable (M12 to micro USB service port, length 0.3 m)	774931 / 773254
Bürkert Communicator PC software (Type 8920)	Type 8920