Bürkert Type 3361 electromotive 2-way globe control valve is the solution when it comes to control tasks under demanding operating conditions. The electromotive actuator with ball screw positions the control cone with the highest precision. A unique feature is its high positioning speed of up to 6 mm/s that reacts almost delay-free to process signals and can be varied according to customer demands. Pressure variations or shocks in the medium are not transferred to the valve position. Each flow-optimised valve body can be equipped with up to 5 different valve seats for a precise adaptation according to customer needs.

If necessary, the safety position can be approached by an optional energy storage in case of power failure. Actuator and valve are adapted perfectly to each other with a closed design and robust surface. This ensures the hygienic requirements of fast and residue-free cleaning. Harsh environmental conditions are no problem for the Type 3361 because of the degree of protection IP65/IP67 and its high impact and vibration resistance. Unrivalled service life and tightness are guaranteed by the proven self-adjusting packing gland with exchangeable V-seals. The fieldbus-compatible Type 3361 provides many helpful functions for process monitoring, valve diagnostics, and predictive maintenance.

General Technical Data

Product properties	Description
Design	Globe control valve
Nominal diameter	DN 10 to DN 100, NPS 3/8 to 4
Safety setting (power failure)	With SAFEPOS energy-pack: open, closed or freely programmable position. Without: blocked in last position
Flow direction	Against closing direction (below seat)
Controller variant	Positioner or process controller (option)
Operating pressure	0 to 25 bar(g), 40 bar(g) on request. Vacuum variant down to -0.9 bar(g) (optional)
Nominal pressure	PN 25/PN 40 (DIN EN 1333), Class 150 (DIN EN 1759)
Kv value	0.1 to 140 m³/h
Flow characteristic	Equal percentage, linear (on request)
Seat leakage	Class III, IV and VI (DIN EN 60534-4)
Theoretical rangeability	Up to 50:1
Travel speed	6 mm/s (AG2 1300 N), 4 mm/s (AG2 2500 N), 3 mm/s (AG3 7700 N and 10000 N)
Operating voltage	24 V DC ± 10 % (maximum residual ripple 10 %)
Operating medium	Steam, neutral gases, water, alcohols, oils, fuels, hydraulic fluids, salt solutions, organic solvents, oxygen (optional), hydrogen (optional), lyes (optional)
Medium temperature	-40 °C to +230 °C
Degree of protection	IP65/IP67 (DIN EN 60529), NEMA 4X

Actuator Sizes

• AG2: Actuator size 2 with a nominal force of 1300 or 2500 N for seat size 3 to 50.
• AG3: Actuator size 3 with a nominal force of 7700 or 10000 N for seat size 40 to 100.

Approvals and Conformities

• Explosion Protection (Optional): ATEX / IECEx Category 3 device suitable for zone 2/22 (Ex ec IIC T4 Gc / Ex tc IIIC T135 °C Dc).
• North America: Actuators UL Listed for the USA and Canada (UL 61010-1).
• Drinking Water (Optional): Materials comply with UBA assessment principles. Suitable for products with a maximum temperature of +85 °C.
• Foods and Beverages / Hygiene: FDA compliant, USP Class VI biocompatible, EC Regulation 1935/2004 compliant, and China food GB Standards compliant.
• Oxygen / Hydrogen (Optional): Suitable for use with gaseous oxygen or hydrogen according to the manufacturer's declaration.

Materials

Actuator Materials

Component	Material (AG2 / AG3)
Display housing / blind cover	PPS (standard), stainless steel 1.4301 (for ATEX/IECEx)
Actuator cover	PPS (AG2) / PC (AG3)
Seal	EPDM
Actuator housing	Powder-coated aluminium
Actuator base	PPS (AG2) / Stainless steel 1.4308 (AG3)

Valve Body Materials

Component	Material
Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
Spindle seal	PTFE V-seals (filled) with spring compensation
Seat seal	Stainless steel 1.4571 (optionally hardened), PTFE or PEEK seal washer
Control cone / Valve seat	Stainless steel 1.4571 (optionally hardened)
Valve body	Stainless steel CF3M

Performance Specifications

Flow Characteristics

The globe control valve features an equal-percentage flow characteristic according to DIN EN 60534-2-4 (linear characteristic curve on request). The theoretical rangeability varies depending on the seat size.

Operating Limits

In addition to the maximum operating pressures, the application range of Bürkert process valves is limited by the nominal pressure in accordance with the relevant standard.

The maximum permissible temperature for the environment and the medium are dependent on each other. The maximum allowable temperature curves of different device variants are shown in the temperature charts below.

AG2 Actuator:

AG3 Actuator:

Seat Seal Selection

• Stainless Steel (Metal Seal): -40 °C to +230 °C. Leakage class III/IV. Recommended for demanding process conditions (cavitation, erosion).
• PTFE (Soft Seal): -40 °C to +130 °C. Leakage class VI. Tight sealing.
• PEEK (Soft Seal): -10 °C to +230 °C. Leakage class VI. Tight sealing for higher temperatures.

Product Design and Assembly

The electromotive linear drive consists of a brushless DC motor, a gear, and a spindle system that transfers the force to the closing element. The integrated electronics are controlled either by standard signals or via a fieldbus (digital). A positioner and a process controller are available as controller variants.

Design of electromotive valve Type 3361 AG2:

Design of electromotive valve Type 3361 AG3:

Integrated Position and Process Controllers

The position of the actuator (stroke) is controlled according to the position set-point value. The position set-point value is either given by an external standard signal (analogue) or via a fieldbus (digital). The additionally implemented PID controller allows process control. The set-point position of the valve is calculated from the external signal (e.g., level, pressure, flow rate, temperature) for the process set-point and the actual process value via the control parameters.