The Bürkert Type 3361 is an innovative electromotive 2-way globe control valve designed for demanding operating conditions. The electromotive actuator with a ball screw positions the control cone with the highest precision. A unique feature is its high positioning speed of up to 6 mm/s, which 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-optimized valve body can be equipped with up to 5 different valve seats for precise adaptation to customer needs.

If necessary, a safety position can be approached by an optional energy storage (SAFEPOS energy-pack) in case of a power failure. The actuator and valve are perfectly adapted to each other with a closed design and robust surface, ensuring hygienic requirements for fast and residue-free cleaning. Harsh environmental conditions are easily handled thanks to the IP65/IP67 degree of protection and 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	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 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)
Kvs 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)
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

Note on Actuator Sizes

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

Approvals and Conformities

Depending on the specific variant, the Type 3361 valve complies with various standards and approvals:

• Explosion Protection: ATEX (II 3G Ex ec IIC T4 Gc, II 3D Ex tc IIIC T135 °C Dc) and IECEx.
• North America: UL Listed for the USA and Canada (UL 61010-1).
• Drinking Water: Suitable for use in drinking water applications (max +85 °C).
• Foods and Beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, and China food GB Standards.
• Others: Suitability for oxygen, hydrogen, and 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	Stainless steel 1.4571 (optionally hardened)
Valve seat	Stainless steel 1.4571 (optionally hardened)
Valve body	Stainless steel CF3M
Actuator housing	Powder-coated aluminium

Dimensions

Actuator AG2

Actuator AG3

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). It offers different theoretical rangeabilities depending on the seat size, up to 50:1.

Operating Limits for Seat Seal

Tight sealing required	Leakage class (DIN EN 60534-4)	Medium temperature	Seat seal
No (Additional shut-off valve recommended)	III/IV (metal seals)	-40 °C to +230 °C	Stainless steel
Yes	VI (soft seals)	-40 °C to +130 °C	PTFE
Yes	VI (soft seals)	-10 °C to +230 °C	PEEK

Operating Limits

The maximum permissible temperature for the environment and the medium are dependent on each other. For particularly demanding process conditions such as cavitation or erosion by wet steam, hardened cones and seats can be used to significantly increase the service life.

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 (analogue) or via a fieldbus (digital). A positioner and a process controller are available as controller variants.

The intelligent process valve Type 3361 offers the operator options for process monitoring, valve diagnosis, and preventive maintenance. Internal measurements of the operating state are evaluated and, if necessary, issued as a warning or error message. A special feature of the globe control valve is the screwed-in valve seat which can be replaced to reduce the seat size.