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.

• Highly precise, dynamic closed-loop control
• Weather, impact and vibration resistant design
• Several Kvs values per port size due to removable valve seats
• Position controller and process controller available

General Technical Data

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

Product properties	Description
Design	Globe control valve
Nominal diameter	DN 10...DN 100, NPS 3/8...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

Materials

Component	Material
Spindle	Stainless steel 1.4401 (316)/1.4404 (316L)
Spindle seal	PTFE V-seals (filled) with spring compensation
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 body	Stainless steel CF3M
Actuator housing	Powder-coated aluminium

Performance Specifications

Flow Characteristics

• Equal-percentage flow characteristic according to DIN EN 60534-2-4 (linear characteristic curve on request)
• Theoretical rangeability: Kvs / Kv0

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.

Operating limits for seat seal

• Stainless steel (Class III/IV): -40 °C to +230 °C. Metallic seals are impervious even under demanding process conditions.
• PTFE (Class VI): -40 °C to +130 °C. Soft seal for tight closing.
• 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.

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.