BURKERT 349372 (Type 3361) is an electromotive 2-way globe control valve engineered for high-precision throttling tasks in demanding industrial and hygienic process environments. The unit integrates a brushless DC linear actuator (size AG2, 1300 N driving force) with a ball screw transmission, driving a parabolic control cone at positioning speeds up to 6 mm/s. Flow enters below the seat (direction 2 -> 1), eliminating pressure hammer effects and ensuring process stability against line pressure fluctuations. Configured with a 2" ANSI B16.5 Class 150 flanged stainless steel body (CF3M) and a 32 mm orifice seat, the valve achieves a nominal flow rate (Kvs) of 21 m³/h (water) with an equal percentage flow profile and a 50:1 theoretical rangeability.

Operating on 24 V DC, this model incorporates an integrated positioner with an internal positioning dead band of ±0.1%, an EtherNet/IP fieldbus gateway, and a local blind cover interface equipped with internal pushbuttons and DIP switches. Sealing integrity is maintained by a spring-loaded PTFE chevron packing gland alongside a replaceable PTFE seat seal disc rated to DIN EN 60534-4 Leakage Class VI up to 16 bar(g). The wetted stainless steel materials comply with EC Regulation 1935/2004 for food contact, and the entire outer housing is rated IP65/IP67 and NEMA 4X with Ecolab-certified chemical washdown resistance.

Technical Specifications

Specification Parameter	Value / Detail
Product Model & Type	BURKERT 349372 (Type 3361)
Valve Construction	2-way straight globe control valve
Pipeline Nominal Diameter	DN 50 (2")
Pipe Connection Standard	Flange according to ANSI B16.5 Class 150 (face-to-face FTF 37 per DIN EN 558-2)
Orifice / Seat Size	32 mm (1 1/4")
Flow Factor Kvs	21 m³/h (water per DIN EN 60534-2-4)
Flow Factor Cv	24.3 gal/min
Flow Characteristic	Equal percentage (theoretical rangeability 50:1)
Flow Direction	Under seat (direction 2 -> 1, against closing direction)
Operating Pressure Range	0.00 to 16.00 bar(g)
Nominal Pressure Class	Class 150 (ASME B16.34) / PN 25 (DIN EN 1333)
Seat Leakage Performance	Class VI according to DIN EN 60534-4 (bubble-tight soft seal)
Operating Medium Temperature	-10 °C to +130 °C (recommended for PTFE seat seals)
Ambient Operating Temperature	-25 °C to +65 °C (refer to derating curves for module installations)
Kinematic Viscosity Limit	Up to 600 mm²/s
Operating Supply Voltage	24 V DC ±10% (maximum residual ripple 10%)
Operating Current Draw	Max. 3 A at peak load; additional 2 A at minimum operating temperature
Standby Power Draw	2 to 5 W
Actuator Size & Driving Force	AG2 / 1300 N nominal thrust
Linear Travel Speed	6 mm/s
Typical Closing Time	4.5 s (stroke and travel-speed dependent)
Position Control Dead Band	±0.1%
Fail-Safe Operation (Power Loss)	Static blocking in last physical position (no internal electrical energy pack)
Digital Communications	büS service interface + integrated EtherNet/IP fieldbus gateway
Protection Class & Degree	Class III (DIN EN 61140); IP65 / IP67 (DIN EN 60529), NEMA 4X
Food & Washdown Standards	EC Regulation 1935/2004 compliant; Ecolab F&E/P3-E No. 40-1 test passed

Materials of Construction

The Type 3361 valve assembly combines a powder-coated aluminium and technical polymer actuator casing with an investment-cast austenitic stainless steel valve body. The wetted trim incorporates precision-machined 1.4571 (316Ti) stainless steel internals and pure PTFE soft-sealing components.

Actuator Material Breakdown (AG2 Variant)

Item No.	Actuator Sub-Assembly	Material Specification
1	Blind Cover / Gateway Module Housing	PPS (Polyphenylene sulphide)
2	Actuator Upper Cover	PPS
3	Housing Static Seals	EPDM
4	Main Actuator Housing	Powder-coated die-cast aluminium
6	Inter-Housing Gaskets	EPDM
7	Actuator Bottom Base	PPS

Valve Body and Wetted Components

Item No.	Valve Part Component	Material Specification
1	Valve Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
2	Spindle Packing Gland	Filled PTFE V-rings with Belleville spring preloading
3	Spindle Guiding Bushing	Stainless steel 1.4404 (316L)
4	Packing Gland Tube	Stainless steel 1.4401 (316)
5	Body Joint Seal Ring	Graphite or pure PTFE
6	Seat Sealing Element	PTFE sealing disc insert
7	Parabolic Control Cone	Stainless steel 1.4571 (316Ti)
8	Replaceable Threaded Valve Seat	Stainless steel 1.4571 (316Ti)
9	Valve Seat O-ring	EPDM or PTFE
10	Valve Body Casting	Cast stainless steel CF3M (equivalent to AISI 316L)

Physical Dimensions

Dimensions below detail the Type 3361 DN50 flanged configuration conforming to ANSI B16.5 Class 150 face-to-face standards (FTF 37 per DIN EN 558-2).

ANSI B16.5 Class 150 Flange Dimensions

Nominal Diameter	Flange OD (∅ DF)	Face-to-Face (LF)	Bolt Circle (∅ BF)	Flange Thick. (AF)	Hole Dia. (∅ D)	Bolt Pattern (A × α)	Raised Face (∅ MF)
2" (DN 50)	152 mm	254 mm	120.7 mm	19.1 mm	19.1 mm	4 × 90°	52.6 mm

Actuator Assembly Heights (AG2)

• Standard Actuator Height (H1): 485 mm (measured from pipeline center to top of blind cover; closed stroke position without tight seating adds approx. 2 mm).
• Fieldbus Gateway Actuator Height (H2): 557 mm (measured from pipeline center to top of installed EtherNet/IP gateway module).
• Total Actuator Weight: Approx. 5.5 kg (excluding valve body).

Fluidic Characteristics and Flow Data

Article 349372 features a 32 mm orifice seat inside a DN50 valve body, yielding a full-stroke Kvs value of 21 m³/h. The control contour is characterized by an equal percentage curve according to DIN EN 60534-2-4 with a 50:1 theoretical rangeability. At 5% stroke, the certified minimum controllable flow (KvR) is 0.48 m³/h.

Discrete Kv Values at Incremental Stroke Positions

Orifice Size	Actuator Force	Max. Delta P	Kv at 5%	Kv at 10%	Kv at 20%	Kv at 30%	Kv at 40%	Kv at 50%	Kv at 60%	Kv at 70%	Kv at 80%	Kv at 90%	Kvs (100%)
32 mm (1 1/4")	1300 N	16 bar(g)	0.48	0.60	0.90	1.3	2.1	3.2	4.6	6.9	11.6	16.0	21.0 m³/h

INFO

Kv values are determined using ambient water under standardized test conditions in accordance with DIN EN 60534-2-4. Under compressible fluid service (gases or dry steam), flow calculations must adhere to standard gas sizing formulas with flow oriented against the closing direction (under seat).

Operating Limits and Environmental Derating

Maximum allowable media and ambient working conditions are interdependent. Operating article 349372 requires consideration of standard ANSI Class 150 pressure-temperature curves, actuator heat dissipation, and soft-seal thermal limits.

• Seat Seal Thermal Ceiling: PTFE seat inserts provide Class VI bubble-tight shut-off between -10 °C and +130 °C. For process fluids exceeding +130 °C, PEEK or metal-to-metal seating configurations must be selected.
• Pipeline Pressure Limits: Flange rating Class 150 governs pipeline structural limits per ASME B16.34, while internal seat differential shut-off is limited to 16.00 bar(g) by the 1300 N AG2 actuator.
• Ambient Temperature Derating: When fitted with an integrated EtherNet/IP fieldbus gateway, elevated media temperatures reduce the allowable ambient room temperature from +65 °C toward +55 °C at maximum continuous motor duty.

Electrical Interfaces and Bus Connectivity

Electrical connection is established via industrial M12 circular connectors located on the actuator base and the top-mounted fieldbus gateway module.

Connector Port Overview

• Port X1 (Actuator Base): M12 circular plug, 8-pin, A-coded. Handles analog setpoint, analog feedback, and binary inputs/outputs.
• Port X3 (Actuator Base): M12 circular plug, 5-pin, A-coded. Supplies 24 V DC main operating power and local büS/CANopen communication lines.
• Port X7 (Fieldbus Gateway): Two M12 circular sockets, 4-pin, D-coded. Provides 10/100 Mbps industrial Ethernet switching for EtherNet/IP protocol networks.

Pin Assignment Tables

Port X1 — Analog & Binary Signals (M12 8-Pin Plug, A-Coded)

Pin Number	Signal Assignment	Electrical Characteristics
1	Digital Input +	0 to 5 V = log "0", 10 to 30 V = log "1"
2	GND (Digital Return)	Common ground reference for binary I/O
3	Digital Output 2 +	PNP transistor output, max. 100 mA current limit
4	Digital Output 1 +	PNP transistor output, max. 100 mA current limit
5	Analogue Output -	Galvanically isolated current/voltage return
6	Analogue Output +	0/4 to 20 mA (load 0 to 800 Ω) or 0 to 5/10 V (max. 10 mA)
7	Set-Point / Analogue Input -	Differential analog setpoint return
8	Set-Point / Analogue Input +	0/4 to 20 mA (input resistance 70 Ω) or 0 to 5/10 V (22 kΩ)

Port X3 — Power Supply & büS Service (M12 5-Pin Plug, A-Coded)

Pin Number	Signal Assignment	Electrical Characteristics
1	CAN Shield	Cable braid grounding shield
2	Operating Voltage +	24 V DC ±10% (max. residual ripple 10%)
3	GND / CAN_GND	Power ground / bus ground reference
4	CAN_H	CAN high dominant signal level
5	CAN_L	CAN low dominant signal level

Port X7 — Industrial Ethernet Fieldbus (M12 4-Pin Socket, D-Coded)

Pin Number	Signal Assignment	Ethernet Direction
1	Transmit + (Tx+)	Differential transmit positive pair
2	Receive + (Rx+)	Differential receive positive pair
3	Transmit - (Tx-)	Differential transmit negative pair
4	Receive - (Rx-)	Differential receive negative pair

Positioner Operation and Control Design

Article 349372 functions as an autonomous closed-loop positioning valve. An internal linear displacement transducer monitors the precise vertical stroke (POS) of the actuator spindle. The microcontroller continuously compares the actual valve position with the target setpoint (CMD) received either over EtherNet/IP or through the analog standard input.

When a control deviation (Xd1) occurs, the electronics drive the brushless DC motor via the manipulated variable (CTRL), repositioning the ball screw until the physical position matches setpoint criteria within the ±0.1% dead band. In the event of control voltage interruption, this configuration blocks statically in its current position.

Local Status and Configuration

• 360° Optical Status Ring: Multi-color LED illumination ring mounted below the blind cover displays immediate device health, travel motion, limit positions, and fieldbus communication diagnostics.
• Mechanical Position Indicator: A yellow indicator pin beneath the transparent viewing cylinder indicates actual mechanical valve position even when power is disconnected.
• DIP Switch Settings: Four internal switches set operating modes. DIP switch 4 alternates between AUTOMATIC mode (downwards) and MANUAL mode (upwards/ON).
• Local Pushbuttons: Two internal buttons allow manual electrical opening and closing during commissioning without requiring external control signals.

Installation, Mechanical Override, and Maintenance

Installation requires standard ANSI Class 150 flange bolting, with preferred mounting orientation upright. The actuator mechanism and valve seat may be serviced or replaced without removing the body casting from the pipeline.

Mechanical Manual Override Restrictions

The mechanical manual override must only be engaged when the actuator is completely de-energized. Use a 3 mm Allen key to depress and turn the override spindle counter-clockwise to open, clockwise to close. Never exceed the maximum torque limit of 2 Nm, as excessive force damages internal geartrain limits.

Assembly Tightening Specifications

Mechanical Joint Connection	Fastener / Fitting Size	Specified Torque Value
Body Connection to Valve Body (DN 50)	Body neck thread with wrench flats	70 ± 3 Nm (52 ± 2 lbf ft)
Valve Seat Ring Installation (Size 32)	Threaded replaceable seat insert	65 + 5 Nm
Spindle Guide Bushing (ø14 mm spindle)	Body neck internal thread	60 Nm
Actuator Housing Fastening Screws	4x T25 hexalobular screws	5.0 Nm
Fieldbus Gateway Mounting Screw	1x 3 mm socket head screw	1.1 Nm

Calibration Routine (X.TUNE)

Following any mechanical disassembly, spindle packing replacement, or valve seat exchange, run the integrated X.TUNE self-calibration routine to map mechanical stop boundaries. Run X.TUNE only on a completely depressurized piping system. Press and hold the internal OPEN and CLOSE pushbuttons simultaneously for 5 seconds until the LED ring illuminates solid orange.

Compatible Accessories and Spares

Accessory / Spare Description	Article Order Number
USB büS Interface Set 1 (Type 8923 with power supply and cables)	772426
USB büS Interface Set 2 (Type 8923 without power pack)	772551
büS M12 to Micro-USB Configuration Cable Adapter	774931
SIM Card for Device Parameter Cloning and Firmware Transfer	291773
M12 Female Cable Connector (8-pin, A-coded, length 2.0 m) for Port X1	919061
M12 Female Cable Connector (4-pin, A-coded, length 5.0 m) for Port X3 Power	918038
M12 D-coded to RJ45 Industrial Ethernet Cable (length 5.0 m) for Port X7	775053
Replacement Valve Seat Set (Seat Size 32, DN 50 body, with seals)	262176
Replacement Parabolic Control Cone Set (PTFE/Steel, Seat Size 32, DN 50)	226969
Packing Gland Seal Replacement Kit (Spindle ø14 mm, DN 25 to DN 50)	285722
Specialized Seat Installation Socket Tool (DN 50 valve body)	652609
Klüberpaste UH1 96-402 Assembly Lubricant (Tube)	Standard Burkert Spare