BURKERT 362825 (Type 3361) is an electromotive 2-way globe control valve engineered for continuous, high-precision modulation in demanding process conditions. Driven by a brushless DC motor with a precision ball screw, the unit delivers a positioning speed of 6 mm/s with a dead band of ±0.1%, compensating for process disturbances without pressure transfer from the pipeline back to the valve stem. Configured under article number 362825, this unit features a cast stainless steel CF3M valve body with G 3/8 internal thread (DN 10), an orifice seat diameter of 6 mm (1/4"), and a replaceable PEEK seat seal providing Class VI tight shut-off in accordance with DIN EN 60534-4 up to 25 bar(g).

The assembly includes the AG2 electromotive linear actuator delivering 1,300 N of positioning force, paired with an integrated electrical energy storage unit (SAFEPOS energy-pack) configured to close the valve automatically upon line power failure. Operator configuration and monitoring are supported locally via an integrated rugged display with push buttons and an optical 360° multi-colour LED status ring, as well as digitally through the Bürkert system bus (büS / CANopen) service interface. The unit conforms to EC Regulation 1935/2004 for wetted parts and carries explosion protection certifications for ATEX and IECEx Zone 2/22 (Category 3).

Technical Specifications

Specification Parameter	Value / Characteristic
Valve Type	Type 3361 electromotive globe control valve
Article Number	362825
Port Connection Size	G 3/8 female thread (DIN ISO 228-1), nominal diameter DN 10
Nominal Seat Diameter	6 mm (1/4")
Flow Coefficient (Kvs)	1.25 m³/h (water at +20 °C, DIN EN 60534-2-4)
Flow Characteristic	Equal percentage (theoretical rangeability 50:1)
Flow Direction	Below seat (direction 2 → 1)
Operating Pressure Range	0 to 25 bar(g)
Nominal Pressure Rating	PN 25 (DIN EN 1333) / Class 150 (DIN EN 1759)
Seat Leakage Rate	Class VI soft seal (DIN EN 60534-4)
Actuator Size / Force	AG2 / 1,300 N nominal driving force
Actuator Travel Speed	6 mm/s
Typical Closing Time	3.4 s (3,400 ms)
Control Dead Band	±0.1% of stroke
Power Supply	24 V DC ±10% (maximum residual ripple 10%)
Operating Current	Max. 3 A (including 1 A SAFEPOS charging current)
Standby Power	2 to 5 W
Duty Cycle	100% continuous
Fail-Safe Safety Action	Normally closed (NC) via SAFEPOS energy-pack
Local User Interface	Digital display with operation keys and 360° LED halo
Analogue Signals	Setpoint: 0/4 to 20 mA (70 Ω) or 0 to 5/10 V (22 kΩ); 1 digital input; 1 analogue output; 2 digital outputs
Digital Service Port	büS / CANopen via M12 connector
Process Medium Temp.	-10 °C to +150 °C (water, steam, neutral gases, aggressive fluids)
Ambient Temperature	-25 °C to +55 °C (with display module and SAFEPOS)
Degree of Protection	IP65 / IP67 (DIN EN 60529), NEMA 4X
Explosion Protection	ATEX: II 3G Ex ec IIC T4 Gc, II 3D Ex tc IIIC T135°C Dc; IECEx

Construction Materials

Item No.	Actuator Component	Material
1	Display housing / blind cover	PPS (standard), stainless steel 1.4301 (for ATEX/IECEx)
2	Actuator cover	PPS
3, 6	Housing seals	EPDM
4	Actuator housing body	Powder-coated aluminium
7	Actuator base	PPS

Item No.	Fluidic Component	Material
1	Valve spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
2	Spindle seal pack	Solid PTFE V-seals with spring compensation
3	Spindle guide	Stainless steel 1.4404 (316L)
4	Packing gland tube	Stainless steel 1.4401 (316)
5	Valve body joint seal	Graphite or PTFE
6	Seat seal disc	PEEK (Polyetheretherketone) seal washer
7	Control cone	Stainless steel 1.4571 (316Ti)
8	Replaceable valve seat	Stainless steel 1.4571 (316Ti)
9	Seat O-ring	EPDM or PTFE
10	Valve body	Cast stainless steel CF3M (316L equivalent)

Dimensions and Mechanical Installation

Connection DN	Thread D	Thread Depth E [mm]	Body Face-to-Face LM [mm]	Wrench Flat AF [mm]	Total Height H1 [mm]
DN 10 (NPS 3/8)	G 3/8	12.0	65	27	417

Mechanical Dimensions Note

In the closed valve position without tight closing function, the actuator is raised by approximately 2 mm. Recommended installation position is upright with the actuator facing upwards, although any mounting attitude is permissible.

Electrical Connections and Pin Assignments

Article 362825 features an AG2 actuator equipped with M12 circular connectors for analogue control signals (X1) and 24 V DC power supply / büS networking (X3).

Input and Output Signals (Connector X1)

• Connector type: M12 plug, 8-pin, A-coded

Pin	Signal Assignment	Functional Characteristics
1	Digital input +	0 to 5 V = log "0", 10 to 30 V = log "1"
2	GND (Digital)	Common ground for digital input and digital outputs
3	Digital output 2 +	PNP transistor output, current limited to 100 mA
4	Digital output 1 +	PNP transistor output, current limited to 100 mA
5	Analogue output -	Galvanically isolated analogue feedback ground
6	Analogue output +	0/4 to 20 mA (load 0 to 800 Ω) or 0 to 5/10 V (max. 10 mA)
7	Setpoint input -	Analogue setpoint input negative terminal
8	Setpoint input +	0/4 to 20 mA (input resistance 70 Ω) or 0 to 5/10 V (22 kΩ)

Power Supply and büS Communication (Connector X3)

• Connector type: M12 plug, 5-pin, A-coded

Pin	Signal Assignment	Description
1	CAN Shield	Cable shield connection
2	Supply voltage +	24 V DC ±10%
3	GND / CAN_GND	Power supply ground and CAN reference
4	CAN_H	Bürkert system bus CAN high signal
5	CAN_L	Bürkert system bus CAN low signal

Fluidic Sizing and Flow Characteristics

Article 362825 uses an equal-percentage control contour conforming to DIN EN 60534-2-4 with a theoretical rangeability of 50:1. The intermediate flow coefficients measured with water under flow below seat (2 → 1) conditions are defined below.

Stroke [%]	Kv Value [m³/h]	Relative Capacity [%]
10%	0.007	0.56%
20%	0.011	0.88%
30%	0.045	3.60%
40%	0.085	6.80%
50%	0.160	12.8%
60%	0.260	20.8%
70%	0.410	32.8%
80%	0.650	52.0%
90%	1.100	88.0%
100%	1.250	100.0%

Operating Limits on Media and Seat Seal

PEEK soft seal washers provide tight Class VI shut-off across a medium temperature span of -10 °C to +150 °C (continuous capability up to +230 °C). The maximum operating pressure is 25 bar(g) across all stroke positions. In contrast to metal-to-metal seating, no supplementary shut-off valve is required in the pipeline.

Integrated Position Controller and User Interface

An internal contactless displacement transducer continuously detects the linear position (POS) of the drive spindle. The digital positioner compares POS against the external setpoint command (CMD) specified via the 4 to 20 mA or büS input. Any control deviation (Xd1) triggers the motor electronics via manipulated variable CTRL to drive the brushless motor until deviation falls within the ±0.1% dead band.

Operation and Local Indication

• Display Module: Equipped with a graphic display and tactile navigation keys allowing direct switching between AUTOMATIC and MANUAL modes, stroke calibration, and parameter monitoring.
• 360° LED Halo: Indicates operating state, end positions (open, closed), warnings, and errors in clearly distinct optical colour modes.
• Mechanical Position Indicator: A mechanical yellow indicator visible through the transparent window shows physical valve stem position even when electrical power is absent.
• Manual Actuation: In power-free conditions, the valve can be actuated manually using a 3 mm Allen key applied to the mechanical override mechanism located beneath the display cover. Maximum allowable torque is 2 Nm.

Fail-Safe Safety Position (SAFEPOS Energy-Pack)

Article 362825 includes the factory-installed SAFEPOS energy-pack capacitive storage module. When line power fails, stored electrical energy drives the brushless motor into the defined fail-safe position:

• Delivery Setting: Normally closed (NC).
• Charging Time: Ready for operation within 120 seconds after applying 24 V DC power.
• Service Life: Up to 10 years depending on ambient thermal conditions; status is continuously evaluated and alerted via predictive maintenance diagnostics.

Maintenance, Torques, and Service Guidelines

Critical Service Warnings

• Never execute the X.TUNE self-calibration routine under active medium pressure. Running X.TUNE under line pressure causes incorrect end-position detection and compromises control accuracy.
• When removing the actuator from the valve body, always drive the valve into the open position (at least 1/3 stroke open) to prevent damage to the control cone and PEEK seat seal disc.

Recommended Tightening Torques

• Valve body connection (DN 10): 45 ±3 Nm (33 ±2 lbf·ft)
• Replaceable valve seat (DN 10 / seat size 6 mm): 20 +3 Nm (using installation tool 652604)
• Spindle guide packing tube (ø10 mm spindle): 15 Nm
• Actuator cover screws (T25): 5 Nm
• Mechanical manual override hex socket: Max. 2 Nm (do not overtighten beyond end stop)
• Auxiliary lubricant: Klüberpaste UH1 96-402 for stainless steel threads and assembly interfaces.