Bürkert Type 3361 (SKU 350133) is an innovative electromotive 2-way globe control valve designed for demanding operating conditions. This specific variant features a 1" ANSI B16.5 flange connection, a PTFE seat seal, and operates on 24V DC. It supports a pressure range of 0 to 25 bar and medium temperatures from -10 °C to 130 °C, delivering a Kv value of 12 m³/h.

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. Pressure variations or shocks in the medium are not transferred to the valve position. The flow-optimized stainless steel valve body can be equipped with up to 5 different valve seats for precise adaptation to customer needs.

General Technical Data

Feature	Specification
Design	Globe control valve
Nominal diameter	1" (DN 25)
Port connection	Flange ANSI B16.5
Operating pressure	0 to 25 bar(g)
Nominal pressure	Class 150 (DIN EN 1759) / PN 25
Kv value (water)	12 m³/h
Flow characteristic	Equal percentage 50:1
Operating voltage	24 V DC ± 10 % (maximum residual ripple 10 %)
Medium temperature	-10 °C to +130 °C
Ambient temperature	-25 °C to +65 °C
Degree of protection	IP65/IP67 (DIN EN 60529), NEMA 4X

Approvals and Conformities

Depending on the specific configuration, the Type 3361 series supports various approvals and conformities:

• Explosion protection: ATEX / IECEx (Zone 2/22)
• North America: UL Listed for USA and Canada
• Drinking water: Suitable for use in drinking water applications (up to +85 °C)
• Foods and beverages/Hygiene: FDA, USP, EC Regulation 1935/2004, China food GB Standards
• Others: Suitability for oxygen, hydrogen, and TA Luft

Materials

Actuator Materials

Component	Material
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
Seal valve body	Graphite or PTFE
Seat seal	PTFE (for SKU 350133)
Control cone & Valve seat	Stainless steel 1.4571 (optionally hardened)
Valve body	Stainless steel CF3M

Dimensions

Body with Flange Connection

For the 1" ANSI B16.5 Class 150 flange variant (NPS 1):

• ∅ DF: 108 mm
• LF: 184 mm
• ∅ BF: 79.2 mm
• AF: 14.2 mm
• ∅ D: 15.7 mm
• A x α: 4 × 90°
• ∅ MF: 26.7 mm

Performance Specifications

Flow Characteristics

The valve features an equal-percentage flow characteristic according to DIN EN 60534-2-4, with a theoretical rangeability of 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.

Operating limits for seat seal

By using plastics as sealing material (like PTFE), the control valves can close tightly (Leakage class VI). PTFE is recommended for temperatures up to +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).

Design of Electromotive Valve Type 3361 AG2

Design of Electromotive Valve Type 3361 AG3

Maintenance and Service

Adjusting the Position Control – Running X.TUNE

When the X.TUNE function is run, the position control is adjusted to the physical stroke of the actuating element used. Do not run X.TUNE without requirement. It must be run again only when the actuator has been removed afterwards or the valve body has been changed.

Danger due to uncontrolled process after running the X.TUNE function

If the X.TUNE is run under medium pressure, the controller will be incorrectly adjusted. This will result in an uncontrolled process. Never run the X.TUNE under medium pressure. Secure the system against unintentional activation.

Mechanical Actuation of the Valve

If the supply voltage is not applied (e.g., during installation or in the event of a power failure), the valve position can be changed using the mechanical manual override.

WARNING

The mechanical manual override may be used only when it is de-energized, otherwise the device may be damaged. Maximum tightening torque is 2 Nm.