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.

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. Without: blocked in last position.
Flow direction	Against closing direction (below seat)
Controller variant	Positioner or process controller (option)
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 (AG2 1300 N), 4 mm/s (AG2 2500 N), 3 mm/s (AG3 7700/10000 N)
Operating voltage	24 V DC ± 10 % (maximum residual ripple 10 %)
Protection class	IP65/IP67 (DIN EN 60529), NEMA 4X
Operating medium	Steam, neutral gases, water, alcohols, oils, fuels, hydraulic fluids, salt solutions, organic solvents, oxygen/hydrogen/lyes (optional)
Medium temperature	-40 °C to +230 °C

Actuator Sizes

• AG2: Actuator size 2 with a nominal force of 1300 or 2500 N for seat size 3…50.
• AG3: Actuator size 3 with a nominal force of 7700 or 10000 N for seat size 40…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): Suitable for use in drinking water applications up to +85 °C.
• Foods and Beverages / Hygiene: FDA, USP Class VI, EC Regulation 1935/2004, China food GB Standards.
• Others: Suitability for Oxygen, Hydrogen, and TA Luft (optional variants).

Materials

Actuator Materials (AG2)

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

Valve Body Materials

No.	Component	Material
1	Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
2	Spindle seal	PTFE V-seals (filled) with spring compensation
3	Spindle guide	Stainless steel 1.4404 (316L)
4	Packing gland tube	Stainless steel 1.4401 (316)
5	Seal valve body	Graphite or PTFE
6	Seat seal	Stainless steel 1.4571 (optionally hardened), PTFE or PEEK seal washer
7	Control cone	Stainless steel 1.4571 (optionally hardened)
8	Valve seat	Stainless steel 1.4571 (optionally hardened)
9	O-ring valve seat	EPDM or PTFE
10	Valve body	Stainless steel CF3M

Dimensions

Actuator AG2

Body with Flange Connection

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 is up to 50:1 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.

Seat Seal Operating Limits

• Metal Seals (Class III/IV): -40 °C to +230 °C. Suitable for demanding process conditions (cavitation, erosion).
• PTFE (Class VI): -40 °C to +130 °C.
• PEEK (Class VI): -10 °C to +230 °C (recommended for > +130 °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.

Maintenance & Spare Parts

The Type 3361 is designed for maintainability. Available replacement part sets include:

• Control cone set: Control cone, dowel pin, graphite seal, and lubricant.
• Valve seat set: Valve seat and graphite seal (with O-ring from seat size 25).
• Seal set for packing gland: Individual parts of the packing gland, graphite seal, and lubricant.
• Spindle guide: Spindle guide, graphite seal, and lubricant.