BURKERT 339405 (Type 3361) is an electromotive 2-way globe control valve engineered for continuous closed-loop control in industrial fluid handling systems. Driven by an AG2 electromotive linear actuator equipped with a brushless DC motor and precision ball screw, article 339405 delivers a positioning speed of 6 mm/s at 1,300 N nominal driving force. Operating independently of medium pressure variations, the actuator positions the control cone with a positioning dead band of ±0.1%.

Configured as article 339405, this assembly combines a DN 10 (NPS 3/8) welded stainless steel CF3M body complying with DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B with a 6 mm (1/4") nominal diameter stainless steel seat and a linear 25:1 control cone. The unit achieves a nominal water flow coefficient Kv of 1.2 m³/h (Cv 1.4 gpm) with flow directed below the seat (port 2 → 1). An integrated electrical SAFEPOS energy-pack provides emergency power to drive the valve into a fail-safe closed position upon interruption of the external 24 V DC supply.

Technical Specifications

Specification Parameter	Technical Data (Article 339405 / Type 3361 AG2)
Product Design	Electromotive 2-way globe control valve
Valve Article Number	339405
Valve Type Family	Type 3361
Actuator Size & Driving Force	AG2 (1,300 N nominal force)
Travel Speed	6 mm/s (for AG2 1,300 N)
Typical Closing Time	3.4 s (total AG2 operating range 3.3 to 6.6 s)
Dead Band of Position Control	±0.1%
Nominal Pipeline Diameter	DN 10 (NPS 3/8)
Pipe Interface Standard	DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B (17.2 x 1.6 mm)
Seat Orifice Size	6 mm (1/4")
Flow Coefficient (Water)	Kv = 1.2 m³/h (Cv = 1.4 gpm)
Control Cone Characteristic	Linear 25:1
Operating Pressure Range	0 to 25 bar(g) (PN 25 / Class 150)
Medium Temperature Range	-10 °C to +185 °C
Ambient Temperature Range	-25 °C to +65 °C (with module derating)
Seat Seal Tightness	Leakage Class IV (DIN EN 60534-4)
Operating Supply Voltage	24 V DC ±10% (max. residual ripple 10%)
Operating Current	AG2: Max. 3 A (including 1 A SAFEPOS charging current); +2 A at minimum ambient temperature
Standby Power Consumption	2 to 5 W
Duty Cycle	100% continuous
Electrical Protection Class	Class III (DIN EN 61140)
Ingress Protection	IP65 / IP67 (DIN EN 60529), NEMA 4X
Control Interface	Analogue standard signals, Service-büS, internal buttons/DIP switches (no display)
Food Contact Approvals	EC Regulation 1935/2004, FDA 21 CFR wetted materials conformity
Detergent Resistance	Certified according to Ecolab test method F&E/P3-E No. 40-1

Materials of Construction

Article 339405 uses an all-metal valve body paired with an aluminium and engineered plastic actuator housing. Wetted surfaces satisfy hygienic standards and resist corrosion during industrial washdowns.

Item	Actuator Component (AG2)	Material
1	Blind cover / housing top	PPS (Polyphenylene sulphide)
2	Actuator cover	PPS
3	Seal rings	EPDM
4	Actuator housing	Cast aluminium, powder-coated
6	Housing seal	EPDM
7	Actuator base	PPS

Item	Valve Body Component	Material Specification
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	Body seal	Graphite or PTFE
6	Seat seal	Stainless steel 1.4571
7	Control cone	Stainless steel 1.4571
8	Valve seat	Stainless steel 1.4571
9	O-ring for valve seat	EPDM or PTFE
10	Valve body	Stainless steel CF3M (cast 316L equivalent)

Dimensions and Installation Geometry

All dimensions are specified in millimetres (mm). For closed-position clearance calculations, note that the AG2 actuator spindle raises the actuator head by approximately 2 mm when seated without tight sealing preload.

Port Connection DN	NPS	Actuator Height H1 (Standard Variant)	Actuator Height H2 (Fieldbus Gateway Variant)
10 (Article 339405)	3/8	417 mm	489 mm
15	1/2	417 mm	489 mm
20	3/4	423 mm	495 mm
25	1	446 mm	518 mm
32	1 1/4	474 mm	546 mm
40	1 1/2	479 mm	551 mm
50	2	485 mm	557 mm

Port Connection DN	Weld Depth ES	Face-to-Face Length LS	DIN EN ISO 1127 / ISO 4200 Outer ∅ DS	DIN EN ISO 1127 Wall Thickness WS	DIN 11850-2 Outer ∅ DS	DIN 11850-2 Wall Thickness WS
10 (Article 339405)	20 mm	90 mm	17.2 mm	1.6 mm	13.0 mm	1.5 mm
15	20 mm	90 mm	21.3 mm	1.6 mm	19.0 mm	1.5 mm
20	20 mm	100 mm	26.9 mm	1.6 mm	23.0 mm	1.5 mm
25	26 mm	130 mm	33.7 mm	2.0 mm	29.0 mm	1.5 mm
32	26 mm	140 mm	42.4 mm	2.0 mm	35.0 mm	1.5 mm
40	26 mm	150 mm	48.3 mm	2.0 mm	41.0 mm	1.5 mm
50	26 mm	175 mm	60.3 mm	2.0 mm	53.0 mm	1.5 mm

Electrical Interfaces and Pin Assignment

Article 339405 features an analogue control configuration with internal DIP switches, two push buttons, a 360° LED ring indicator, and a Service-büS port located underneath the removable blind cover.

Circular Connector Assignment Overview

Connector Designation	Physical Format	AG2 Analogue (Article 339405)	AG2 with Fieldbus Gateway	AG2 büS/CANopen Native
X1	M12 circular plug, 8-pin, A-coded	Equipped (Analogue & Digital I/O)	Not equipped	Not equipped
X2	M12 circular socket, 5-pin, A-coded	Optional (Process controller actual value)	Optional	Optional
X3	M12 circular plug, 5-pin, A-coded	Equipped (24 V DC power & Service-büS)	Equipped	Equipped
X7	M12 circular socket, 4-pin, D-coded	Not equipped	Equipped (Ethernet 2-port)	Not equipped

Pin Assignment Tables

Connector X1 (8-pin M12 Male, A-coded)	Pin	Assigned Function
Input and Output Control Signals	1	Digital input +
	2	GND for digital input and digital outputs
	3	Digital output 2 +
	4	Digital output 1 +
	5	Analogue output -
	6	Analogue output +
	7	Set-point value / Analogue input -
	8	Set-point value / Analogue input +

Connector X3 (5-pin M12 Male, A-coded)	Pin	Assigned Function
Supply Voltage & Service Communication	1	CAN Shield / shield
	2	Operating voltage 24 V DC ±10%
	3	GND / CAN_GND
	4	CAN_H (büS)
	5	CAN_L (büS)

Analogue and Digital Signal Parameters

• Analogue Input (Setpoint): Galvanically isolated from power supply and analogue output; configurable for 0/4 to 20 mA (input resistance 70 Ω) or 0 to 5/10 V (input resistance 22 kΩ).
• Analogue Output: Max. 10 mA for 0 to 5/10 V; load range 0 to 800 Ω for 0/4 to 20 mA.
• Digital Input: 0 to 5 V = logical "0", 10 to 30 V = logical "1" (invertible via software).
• Digital Outputs: PNP transistor, current-limited to 100 mA.

Fluidic Performance and Flow Characteristics

Fluid flow is directed below the valve seat (flow path 2 → 1). This orientation prevents hydraulic water hammer upon closing.

Flow Data for DN 10 Port Connection (Flow Below Seat)

Seat Size (Orifice)	Actuator Force [N]	Max Operating Pressure (Seat Seal Leakage Class) [bar]	Theoretical Rangeability	Kv Value at 10% Stroke	Kv Value at 30% Stroke	Kv Value at 50% Stroke	Kv Value at 70% Stroke	Kv Value at 90% Stroke	Nominal Kvs Value (100%) [m³/h]
3 mm	1,300	25 (IV) / 40 (IV)	20:1	0.005	0.013	0.026	0.044	0.077	0.10
3 mm (high)	1,300	25 (IV) / 40 (IV)	20:1	0.009	0.023	0.046	0.085	0.160	0.20
4 mm	1,300	25 (IV) / 40 (IV)	30:1	0.023	0.049	0.097	0.180	0.350	0.50
6 mm (339405)	1,300	25 (IV / VI)	50:1 (Linear 25:1)	0.007	0.045	0.160	0.410	1.100	1.25 (1.20 water)
8 mm	1,300	25 (VI) / 40 (VI)	50:1	0.070	0.120	0.260	0.610	1.500	2.00
10 mm	1,300	25 (VI) / 40 (VI)	50:1	0.110	0.190	0.480	1.000	2.300	2.70

Operating Limits and Temperature Derating

The maximum permissible ambient temperature depends directly on the process fluid temperature. Operating limits must adhere to the DIN EN 12516-1 PN 25 curve and ambient derating boundaries.

Seat Seal Selection Criteria

Seat Seal Material	Leakage Class (DIN EN 60534-4)	Medium Temperature Range	Process Characteristics
Stainless Steel (Article 339405)	Class III / IV (Metal-to-metal)	-40 °C to +230 °C (339405 configured for -10 °C to +185 °C)	Impervious to harsh process media, cavitation, and erosion. Leakage rate: 0.1% to 0.01% of nominal flow.
PTFE	Class VI (Soft seal bubble-tight)	-40 °C to +130 °C (recommended ≤ +130 °C)	Tight shut-off without auxiliary isolation valves; sensitive to abrasive erosion.
PEEK	Class VI (Soft seal bubble-tight)	-10 °C to +230 °C (recommended > +130 °C)	High-temperature tight shut-off; sensitive to severe mechanical erosion.

Ambient vs. Medium Temperature Derating for AG2

For AG2 actuators equipped with the SAFEPOS energy-pack (Curve 3 in the Burkert operating charts):

• At fluid medium temperatures up to +130 °C, the permissible ambient temperature reaches +65 °C.
• At medium temperatures between +130 °C and +185 °C, maximum ambient temperature decreases linearly towards +55 °C.
• Storage and transport temperature boundaries: -40 °C to +70 °C.

Actuator Features, Manual Override, and SAFEPOS

Integrated Position Controller

The positioning electronics calculate deviation Xd1 between external command setpoint CMD (from analogue input X1) and internal spindle displacement sensor actual value POS. The motor drives the ball screw via actuating variable CTRL until positioning deviation is zero.

SAFEPOS Energy-Pack Emergency Reset

The factory-fitted SAFEPOS energy-pack (article 285834 for AG2) stores electrical energy to drive the valve to a predetermined safe position upon power loss:

• Delivery status for article 339405: Normally Closed (NC).
• Full recharge cycle: maximum 120 seconds after 24 V DC restoration.
• Operational lifespan: up to 10 years depending on operating conditions.
• Remaining capacity is monitored internally; warnings generate before end of service life.

Manual Actuation

Manual operation can be performed electrically or mechanically:

• Electrical Manual Actuation: Remove blind cover; set DIP switch 4 upwards to MANUAL; operate OPEN and CLOSE push buttons. A mechanical indicator disk confirms travel through the side window.
• Mechanical Manual Override: Ensure 24 V DC power is disconnected. Using a 3 mm Allen key inserted into the override socket under the blind cover, gently press down and rotate counter-clockwise to open, or clockwise to close.

Mechanical Manual Override Torque Restriction

Never exceed 2 Nm torque when operating the mechanical manual override. Exceeding 2 Nm upon reaching the stroke end stops damages the internal mechanical drive.

Service Instructions and Maintenance Procedures

High Pressure and Hazardous Media Hazard

Before dismantling or servicing the valve, isolate pipeline pressure, vent the system, drain medium completely, and disconnect supply voltage. Wait until the 360° LED ring is extinguished to verify complete SAFEPOS capacitor discharge.

Spindle and Body Fastening Torques

Maintenance Joint	Applicable Size	Required Tightening Torque
Body Connection to Actuator	DN 10 / DN 15 (Article 339405)	45 ±3 Nm (33 ±2 lbf·ft)
Spindle Guide Bushing Thread	DN 10 / DN 15 (Spindle ø10 mm)	15 Nm
Actuator Base Housing Screws	AG2 (4 screws, crosswise)	5 Nm
Valve Seat Ring Thread	DN 10 / DN 15 (Seat sizes 3 to 15 mm)	20 Nm (+3 Nm tolerance)
SAFEPOS Retaining Screw	T10 Torx	1.1 Nm

Replacing the Control Cone

1. Switch actuator to MANUAL operating state and move valve at least 1/3 open.
2. Disconnect 24 V DC power supply; confirm LED ring is completely off.
3. Clamp valve body in a vice and unscrew body connection using an open-end wrench on the wrench flats.
4. Support the control cone cylinder in a prism fixture. Using a 4 mm pin punch (for spindle ø10 mm), drive out the dowel pin.
5. Align the new control cone bore with the spindle, drive in the new dowel pin centered on the spindle axis, and apply Klüberpaste UH1 96-402 to the external body threads.
6. Screw actuator into body, tightening to 45 ±3 Nm.

Replacing the Packing Gland (DN 10)

1. Disassemble the actuator base from the body connection.
2. Unscrew the lower spindle guide (tightened at 15 Nm) and press out the PTFE V-seal chevron pack.
3. Lubricate the chevron seals of the new seal set (article 285685) with silicone grease OKS 1110-3 or Klüberpaste UH1 96-402.
4. Insert parts in the correct sequence, re-thread spindle guide to 15 Nm, and assemble base screws crosswise to 5 Nm.

Position Controller Calibration via X.TUNE

After replacing the control cone, seat, packing gland, or re-mounting the actuator on the valve body, execute the X.TUNE automatic calibration function.

• Ensure line medium pressure is 0 bar(g). Never run X.TUNE under medium pressure.
• Remove the blind cover and simultaneously hold down the OPEN and CLOSE buttons for 5 seconds.
• The 360° LED ring illuminates orange while X.TUNE measures stroke end stops and adapts internal control parameters.

Compatible Accessories and Ordering Data

Accessory Description	Order Identification / Article Number
SAFEPOS energy-pack replacement module (AG2)	285834
Packing gland seal set (Spindle ø10 mm, DN 10 to DN 20)	285685
Stainless steel spindle guide (Spindle ø10 mm, Body DN 15/10)	246577
Control cone set (Seat 6 mm, DN 10/15, Steel/Steel)	152696
Valve seat ring set (Seat 6 mm, DN 10/15)	262146
Valve seat replacement installation tool (DN 15/10)	652604
Holding device for pipe connection DN 15 / DN 20	693770
Plastic blind cover	277881
SIM card for device parameter backup and transfer	291773
M12 circular socket with 5 m cable, 4-pin A-coded (X3 power supply AG2)	918038
M12 circular socket with 2 m cable, 8-pin A-coded (X1 input/output signals)	919061
USB büS interface set 1 (includes power supply, büS stick, terminating resistor, Y-splitter)	772426
USB büS interface set 2 (includes büS stick, terminating resistor, Y-splitter)	772551
büS adapter cable for Service-büS interface (M12 to Micro-USB, 0.3 m)	774931 / 773254
Bürkert Communicator configuration software	Type 8920 (Free download from www.burkert.com)