BURKERT 20052006 (Type 3361) is an electromotive 2-way globe control valve engineered for high-precision continuous fluid regulation in demanding process environments. The unit integrates an AG2 brushless DC electric linear actuator driving a precision ball screw mechanism that provides 1300 N positioning force at a linear speed of 6 mm/s. Fluidic control is delivered through a DN 20 flanged valve body cast in CF3M stainless steel, fitted with a 10 mm (3/8") seat diameter and an equal-percentage control cone offering a 50:1 theoretical rangeability. Rated for operating pressures from 0 to 25 bar(g), this valve configuration features a nominal Kvs flow coefficient of 3.2 m³/h (Cv 3.7 gpm) under flow-below-seat conditions (2 → 1). An integrated SAFEPOS electrical energy storage pack guarantees emergency fail-safe closure to the normally closed status upon loss of line power without relying on mechanical return springs.

Technical Specifications

Operating parameters and electromechanical performance values for BURKERT 20052006 (Type 3361) are summarized below:

Parameter	Specification
Valve Type	Electromotive 2-way globe control valve (Type 3361)
Article Number	20052006
Nominal Port Diameter	DN 20 (NPS 3/4)
Port Connection Type	Flange DIN EN 1092-1, FTF 1 per DIN EN 558-1
Nominal Pressure Class	PN 25 (DIN EN 1333) / Class 150 (DIN EN 1759)
Operating Pressure Range	0 to 25 bar(g)
Seat Orifice Diameter	10 mm (3/8")
Flow Coefficient Kvs / Cv	3.2 m³/h / 3.7 gpm (water, DIN EN 60534-2-4)
Flow Characteristic	Equal percentage, 50:1 theoretical rangeability
Flow Direction	Below seat (against closing direction, port 2 → 1)
Seat Seal / Leakage Rating	Metallic stainless steel 1.4571 / Class IV (DIN EN 60534-4)
Actuator Size / Drive Force	AG2 / 1300 N nominal thrust
Linear Travel Speed	6 mm/s
Typical Closing Time	3.3 s (3300 ms)
Positioning Dead Band	±0.1%
Supply Voltage	24 V DC ±10% (residual ripple max. 10%)
Operating Current	Max. 3 A at max. load (includes 1 A SAFEPOS charging current); +2 A at min. temp
Standby Power Consumption	2 to 5 W
Duty Cycle	100% continuous
Protection Class	Class III (DIN EN 61140)
Ingress Protection	IP65 / IP67 (DIN EN 60529), NEMA 4X
Medium Temperature Range	-10 °C to +185 °C (system limits -40 °C to +230 °C)
Ambient Temperature Range	-25 °C to +65 °C (subject to module derating)
Maximum Fluid Viscosity	Up to 600 mm²/s

Approvals and Standards Compliance

BURKERT Type 3361 fulfills strict European and international requirements for sanitary, industrial, and explosion-protected service:

• Food Contact Safety: Complies with EC Regulation 1935/2004 according to manufacturer declaration (variable code PL01/PL02). All wetted materials comply with FDA Code of Federal Regulations (PL02/PL03), USP biological reactivity testing (PL04), and China Food Safety National Standards GB (PL10).
• Explosion Protection (Optional): ATEX certification BVS 17 ATEX E 117 X (II 3G Ex ec IIC T4 Gc, II 3D Ex tc IIIC T135 °C Dc) and IECEx BVS 17.0100X for Category 3 applications in Zone 2/22 (variable code PX48).
• North American Standards (Optional): Actuator UL Listed for the United States and Canada according to UL 61010-1 and CAN/CSA-C22.2 No. 61010-1 (variable code PU11).
• Drinking Water: Materials comply with the German Federal Environment Agency (UBA) evaluation criteria for TrinkwasserV up to +85 °C hot water (variable code PF39).
• Special Media Suitability: Certified suitable for oxygen service up to 25 bar(g) and +60 °C (variable code NL02), hydrogen service up to 40 bar(g) and +100 °C (variable code NG18), and fugitive emission reduction according to TA-Luft (variable code PM01).
• Detergent Cleanability: Chemical resistance verified by Ecolab test protocol F&E/P3-E No. 40-1.

Materials of Construction

Component materials have been selected to resist industrial washdowns, chemical corrosion, and mechanical vibration. Wetted metallic parts are constructed from molybdenum-bearing austenitic stainless steels.

Item	Actuator Component (AG2)	Standard Material
1	Display housing / Blind cover	Polyphenylene sulphide (PPS); Stainless steel 1.4301 for ATEX/IECEx
2	Actuator cover	Polyphenylene sulphide (PPS)
3, 6	Housing seals	EPDM
4	Actuator housing	Cast aluminium, powder-coated
7	Actuator base	Polyphenylene sulphide (PPS)

Item	Valve Body Component	Standard Material
1	Spindle (Stem)	Stainless steel 1.4401 (316) / 1.4404 (316L)
2	Spindle seal	Filled PTFE V-rings with Belleville spring compensation
3	Spindle guide	Stainless steel 1.4404 (316L)
4	Packing gland tube	Stainless steel 1.4401 (316)
5	Valve body seal	Graphite or PTFE
6	Seat seal	Stainless steel 1.4571 (optionally hardened); soft PTFE or PEEK optional
7	Control cone	Stainless steel 1.4571 (optionally hardened)
8	Valve seat (screwed-in)	Stainless steel 1.4571 (optionally hardened)
9	Valve seat O-ring	EPDM or PTFE
10	Valve body	Cast stainless steel CF3M

Dimensions and Installation Measurements

Actuator heights and body face-to-face dimensions for the DN 20 flanged configuration are detailed below in millimeters:

Port Size DN	Actuator Size	Height H1 (Standard Display)	Height H2 (Fieldbus Gateway Variant)
DN 10	AG2	417 mm	489 mm
DN 15	AG2	417 mm	489 mm
DN 20	AG2	423 mm	495 mm
DN 25	AG2	446 mm	518 mm
DN 32	AG2	474 mm	546 mm
DN 40	AG2	479 mm	551 mm
DN 50	AG2	485 mm	557 mm

Actuator Height Clearance

In the fully closed seated position, the actuator is raised by approximately 2 mm without sealing function deformation. Maintain adequate overhead clearance for servicing.

Port DN	Face-to-Face LF	Flange Outer Ø DF	Bolt Circle Ø BF	Flange Thickness AF	Hole Ø D	Pattern A × α	Chamfer Ø MF
DN 10	130 mm	90 mm	60 mm	16 mm	14 mm	4 × 90°	13.6 mm
DN 15	130 mm	95 mm	65 mm	16 mm	14 mm	4 × 90°	18.1 mm
DN 20	150 mm	105 mm	75 mm	18 mm	14 mm	4 × 90°	23.7 mm
DN 25	160 mm	115 mm	85 mm	18 mm	14 mm	4 × 90°	29.7 mm
DN 32	180 mm	140 mm	100 mm	18 mm	18 mm	4 × 90°	38.4 mm
DN 40	200 mm	150 mm	110 mm	18 mm	18 mm	4 × 90°	44.3 mm
DN 50	230 mm	165 mm	125 mm	20 mm	18 mm	4 × 90°	56.3 mm

Electrical Connections and Control Interfaces

BURKERT 20052006 incorporates an analog setpoint interface with digital status I/O, local operating keys, and a büS service connection for parameterization via the Bürkert Communicator software. Terminal connections are housed under cable feed-through bushings, with circular M12 connectors available for external wiring.

Signal Type	Terminal / Connector Spec	Technical Characteristics
Analog Setpoint Input	X1 (Pins 7, 8)	Galvanically isolated from supply and analog output: 0/4 to 20 mA (70 Ω input impedance) or 0 to 5/10 V (22 kΩ input impedance)
Analog Feedback Output	X1 (Pins 5, 6)	Max. 10 mA for 0 to 5/10 V output; load 0 to 800 Ω for 0/4 to 20 mA current output
Digital Input	X1 (Pins 1, 2)	0 to 5 V = logic "0", 10 to 30 V = logic "1"; inverted logic configurable
Digital Outputs (2x)	X1 (Pins 2, 3, 4)	PNP transistor outputs, current-limited to 100 mA each
Power Supply & büS	X3 (Pins 1 to 5)	Pin 1: CAN Shield; Pin 2: +24 V DC ±10%; Pin 3: GND / CAN_GND; Pin 4: CAN_H; Pin 5: CAN_L
Communication Protocol	Service-büS	CANopen-based Bürkert system bus via micro-USB adapter or USB-büS stick

Fluidic Data and Flow Characteristics

The valve features an equal-percentage flow characteristic curve conforming to DIN EN 60534-2-4. Under flow-below-seat orientation (flow direction 2 → 1), media pressure dampens closure transients and eliminates hydraulic chatter.

Flow rates as a function of valve stroke for DN 20 bodies across available seat sizes are presented below:

Port DN	Seat Size	Actuator Force	Max. Working Pressure	Rangeability	Kv at 10%	20%	30%	40%	50%	60%	70%	80%	90%	Kvs (100%)
DN 20	10	1300 N	25 bar (IV)	50:1	0.12	0.16	0.20	0.33	0.52	0.77	1.2	1.8	2.6	3.2 m³/h
DN 20	15	1300 N	25 bar (IV)	50:1	0.14	0.17	0.22	0.35	0.52	0.80	1.2	1.8	2.9	5.2 m³/h
DN 20	20	1300 N	25 bar (VI)	50:1	0.20	0.25	0.30	0.45	0.70	1.1	1.6	2.4	3.5	7.1 m³/h

Operating Limits and Temperature Derating

Pressure retention adheres to DIN EN 12516-1 standards for PN 25 piping systems. Operating boundaries are governed simultaneously by line pressure, fluid temperature, and environmental heat dissipation.

Seat material characteristics determine achievable shut-off tightness and operating thermal spans:

• Stainless Steel 1.4571 (Article 20052006): Leakage class IV per DIN EN 60534-4 (0.01% of nominal flow). Operating span from -40 °C to +230 °C. Resistant to cavitation, abrasive contaminants, and wet steam erosion.
• PTFE (Soft Seal Variant): Leakage class VI bubble-tight sealing. Operating span from -40 °C to +130 °C. Recommended when absolute shut-off is required without secondary isolation valves.
• PEEK (Polymer Seal Variant): Leakage class VI bubble-tight sealing. Operating span from -10 °C to +230 °C. Suitable for higher-temperature tight shut-off applications.

Functional Design and User Interface

Type 3361 AG2 features a compact, fully enclosed mechanical assembly designed to prevent liquid pooling and dust ingress.

Key physical features include:

• 360° LED Light Ring: Integrated on the actuator cover to signal device state, setpoint deviations, and end positions via customizable colour codes.
• Mechanical Position Indicator: Continuous yellow indicator flag visible through the transparent actuator window during power interruptions.
• Manual Actuation Modes: Operable via electrical push buttons on the display module, or mechanically through a 3 mm Allen key socket under the cover. Mechanical manual override torque must not exceed 2 Nm.
• SAFEPOS Energy Storage: Modular supercapacitor pack providing autonomous travel to the fail-safe position upon line voltage failure. Achieves full operational charge within 120 seconds of energization, with up to 10 years design life.

Closed-Loop Position Control

The internal non-contact displacement sensor measures the real-time linear stroke (POS) of the drive shaft. The internal microprocessor compares POS against the setpoint command (CMD) and actuates the motor via pulse-width variable CTRL, providing dynamic accuracy within a ±0.1% dead band.

Maintenance, Valve Assembly, and Spare Parts

Routine maintenance of Type 3361 involves periodic inspection of the gland relief bore and replacement of wear components using original Bürkert kits.

Depressurize and Open Valve Prior to Disassembly

Before loosening body connections, isolate line pressure, vent the pipe, and ensure the valve is driven to at least 1/3 open position in MANUAL mode. Unscrewing the actuator while the control cone is seated will permanently deform the trim.

X.TUNE Calibration Restriction

Never initiate the automatic X.TUNE stroke adaptation under line pressure. Running X.TUNE while fluid pressure is applied causes severe position calibration errors and erratic process operation.

Fastener Tightening Torques

Joint / Component	Connection Size	Required Tightening Torque
Valve Body to Actuator Connection	DN 20 Body	50 ± 3 Nm (37 ± 2 lbf ft)
Screwed-in Valve Seat	Seat Size 10 (DN 20 body)	28 +3 Nm
Spindle Guide Bushing	Spindle Ø 10 mm (DN 20)	25 Nm
Actuator Cover Fasteners	T25 Torx screws	5 Nm
Mechanical Manual Override	3 mm Hex key	Max. 2 Nm limit
SAFEPOS Locking Screw	T10 Torx screw	1.1 Nm

Replacement Spare Parts and Tools

Component Description	Variant / Application	Order Number
Control Cone Set (Steel/Steel)	Seat Size 10 / DN 20 Body	149 914
Valve Seat Set (with Graphite Gasket)	Seat Size 10 / DN 20 Body	262 151
Packing Gland Seal Set	Spindle Ø 10 mm, DN 15 to DN 20	285 685
Stainless Steel Spindle Guide	Spindle Ø 10 mm, DN 20 Body	246 578
SAFEPOS energy-pack Module	AG2 Actuator Wear Part	285 834
Seat Installation Tool	DN 20 Valve Body	652 605
Modified Socket Wrench (Packing Gland)	Spindle Ø 10 mm, DN 20 Body (SW21)	683 222
USB büS Interface Stick Set 1	Includes power pack, terminator, Y-adapter	772 426
Pipe Holding Bracket Tool	DN 15 to DN 20 Line Connections	693 770