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 highest precision. A unique feature is its high positioning speed up to 6 mm/s that reacts almost delay-free to process signals and that 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 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 is guaranteed by the proven self-adjusting packing gland with exchangeable V-seals.

General Technical Data

Product Properties	Description
Design	Globe control valve
Nominal diameter	DN 10...DN 100, NPS 3/8...4
Safety setting in case of power failure	With energy storage SAFEPOS energy-pack: open, closed or freely programmable position. Without energy storage: blocked in last position
Flow direction	Against closing direction (below seat)
Controller variant	Positioner or process controller (option)
Weight	Depending on actuator variant up to: AG2: 5.5 kg, AG3: 16 kg

Performance Data	Description
Operating pressure	0...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)
Kvs value	0.1...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 (for AG2 1300 N), 4 mm/s (for AG2 2500 N), 3 mm/s (for AG3 7700 N and 10000 N)

Electrical Data	Description
Operating voltage	24 V DC ± 10 % (maximum residual ripple 10 %)
Protection class	III (DIN EN 61140)
Duty cycle	100 %
Standby consumption	2...5 W

Approvals and Conformities

• Explosion Protection (Optional): ATEX / IECEx (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): Suitable for use in drinking water applications up to +85 °C.
• Foods and Beverages / Hygiene: FDA compliant, USP Class VI biocompatible, EC Regulation 1935/2004 compliant, China food GB Standards compliant.
• Other Variants: Oxygen suitability, Hydrogen suitability, TA Luft.

Materials

Component	Material
Spindle	Stainless steel 1.4401 (316) / 1.4404 (316L)
Spindle seal	PTFE V-seals (filled) with spring compensation
Spindle guide	Stainless steel 1.4404 (316L)
Packing gland tube	Stainless steel 1.4401 (316)
Seal valve body	Graphite or PTFE
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

• Equal-percentage flow characteristic according to DIN EN 60534-2-4 (linear characteristic curve on request).
• The globe control valve has different theoretical rangeabilities 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 chart.

Seat Seal Selection

• Stainless Steel (Metal seals): Leakage class III/IV. Suitable for -40 °C to +230 °C. Impervious even under demanding process conditions. Hardened stainless steel recommended for cavitation or abrasive media.
• PTFE (Soft seals): Leakage class VI. Suitable for -40 °C to +130 °C. Allows tight closing.
• PEEK (Soft seals): Leakage class VI. Suitable for -10 °C to +230 °C.

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.

Integrated Position Controller

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 displacement transducer records the actual position (POS) of the electric linear actuator. The positioner compares the actual position value with the position set-point value (CMD) specified as standard signal.

Integrated Process Controller (Optional)

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 (PID controller).

Safety Position via Energy Storage (Optional)

The safety starting positions in case of power interruption is realised with the optional energy storage SAFEPOS energy-pack. The desired position is set via the menu. In addition to the end positions (open/closed), any desired intermediate position can be defined here. Without energy storage, the valve remains in the last position it was in.