PN25
BURKERT 20074958 (Type 3321) is an electromotive 2/2-way on/off globe valve designed for media shut-off in demanding industrial and hygienic fluid applications. Operating on 24 V DC, the valve utilizes an electromotive linear actuator with an integrated ball screw mechanism to position the valve swivel plate at speeds up to 6 mm/s. The unit integrates an AG2 actuator size providing a nominal driving force of 1300 N, delivering tight closure against operating pressures up to 16 bar(g) with flow oriented below the seat. Standard execution includes the SAFEPOS energy-pack emergency storage module, automatically moving the valve to a predefined normally closed safety position if electrical supply power is interrupted.
The process interface of article 20074958 is configured with DN 32 (NPS 1 1/4) welded pipe ends compliant with DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B (pipe outer diameter 42.4 mm, wall thickness 2.0 mm). Constructed with a cast stainless steel CF3M globe body, stainless steel internal trim, and a PTFE seat seal, the assembly achieves leakage rate A tightness according to DIN EN 12266-1. The ingress protection rating of IP65/IP67 and NEMA 4X, combined with an Ecolab-tested housing surface, ensures resistance to washdown procedures, weather exposure, and mechanical impacts in automated process plants.
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Manufacturer Type | 3321 |
| Article Number (SKU) | 20074958 |
| Valve Design | 2/2-way electromotive globe on/off valve |
| Nominal Diameter | DN 32 (NPS 1 1/4) |
| Port Connection Type | Welded pipe connection |
| Port Connection Standard | DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B (42.4 x 2.0 mm) |
| Actuator Size / Driving Force | AG2 / 1300 N |
| Operating Voltage | 24 V DC ±10% (maximum residual ripple 10%) |
| Operating Current | Maximum 3 A (including 1 A SAFEPOS charging current; +2 A at min. temperature) |
| Standby Power Consumption | 2 to 4 W |
| Duty Cycle | 100% continuous duty |
| Protection Class | Class III per DIN EN 61140 |
| Flow Direction | Below seat (against closing direction, port 2 → 1) |
| Nominal Pressure Rating | PN 25 (DIN EN 1333), Class 150 (DIN EN 1759) |
| Operating Pressure Range | 0 to 16 bar(g) |
| Flow Coefficient Kv (Water) | 18.1 m³/h (per DIN EN 60534-2-4) |
| Flow Coefficient Cv | 20.9 gpm |
| Seat Orifice Diameter | 32 mm (1 1/4") |
| Seat Leakage Class | Leakage rate A (DIN EN 12266-1, test medium air) |
| Medium Temperature Range | -10 °C to +130 °C |
| Ambient Temperature Range | -25 °C to +65 °C (refer to derating curves) |
| Typical Closing Time | 4.1 s (travel speed 6 mm/s) |
| Safety Position on Power Loss | Normally closed (NC) via integrated SAFEPOS energy-pack |
| Ingress Protection Rating | IP65 / IP67 (DIN EN 60529), NEMA 4X |
| Control Signals | Binary: 1 digital input (0-5 V log 0, 10-30 V log 1), 2 digital outputs (100 mA) |
| Diagnostic Communication | büS service interface (Bürkert Communicator software Type 8920) |
| Food Conformity | EC Regulation 1935/2004 compliant per manufacturer declaration |
| Detergent Resistance | Tested according to Ecolab test method F&E/P3-E No. 40-1 |
Materials of Construction
The electromotive valve comprises an AG2 actuator mechanism and a fluidic globe valve assembly. The external surfaces and fluid-wetted components are manufactured from industrial-grade alloys and polymers engineered for chemical resistance and cleanability.
Actuator AG2 Materials
| Item No. | Component Part | Material |
|---|---|---|
| 1 | Blind cover / gateway housing | PPS (standard) / stainless steel 1.4301 (ATEX/IECEx variants) |
| 2 | Actuator cover | PPS |
| 3 | Seal | EPDM |
| 4 | Actuator housing | Powder-coated aluminium |
| 6 | Seal | EPDM |
| 7 | Actuator base | PPS |
Valve Body and Internal Trim Materials
| Item No. | Component Part | Material |
|---|---|---|
| 1 | Spindle | Stainless steel 1.4401 (316) / 1.4404 (316L) |
| 2 | Spindle seal | PTFE V-seals (filled) with spring compensation |
| 3 | Spindle guide | PEEK or stainless steel 1.4404 (316L) |
| 4 | Packing gland tube | Stainless steel 1.4401 (316) |
| 5 | Seal valve body | Graphite or PTFE |
| 6 | Swivel plate | Stainless steel 1.4571 |
| 7 | Valve seat seal | PTFE seal washer (PEEK optional for >+130 °C) |
| 8 | Valve seat | Stainless steel 1.4571 |
| 9 | O-ring valve seat | EPDM or PTFE |
| 10 | Valve body | Cast stainless steel CF3M |
Dimensions and Installation Envelope
Dimensions are stated in millimetres. The actuator is mounted directly on the CF3M globe body connection. In the fully closed position, the actuator spindle mechanism is raised by approximately 2 mm.
Actuator AG2 Height Dimensions
| DN | NPS | Standard Height H1 (mm) | Height with Fieldbus Gateway H2 (mm) |
|---|---|---|---|
| 10 | 3/8 | 417 | 489 |
| 15 | 1/2 | 417 | 489 |
| 20 | 3/4 | 423 | 495 |
| 25 | 1 | 427 | 498 |
| 32 | 1 1/4 | 448 | 519 |
| 40 | 1 1/2 | 452 | 524 |
| 50 | 2 | 485 | 557 |
Welded Body Dimensions (DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B)
| DN | Weld Socket Depth ES (mm) | Face-to-Face Length LS (mm) | Pipe Outside Diameter ∅ DS (mm) | Wall Thickness WS (mm) |
|---|---|---|---|---|
| 10 | 20 | 90 | 17.2 | 1.6 |
| 15 | 20 | 90 | 21.3 | 1.6 |
| 20 | 20 | 100 | 26.9 | 1.6 |
| 25 | 26 | 130 | 33.7 | 2.0 |
| 32 | 26 | 140 | 42.4 | 2.0 |
| 40 | 26 | 150 | 48.3 | 2.0 |
| 50 | 26 | 175 | 60.3 | 2.0 |
| 65 | 26 | 210 | 76.1 | 2.3 |
| 80 | 26 | 230 | 88.9 | 2.3 |
| 100 | 26 | 260 | 114.3 | 2.6 |
Electrical Connection and Control Interfaces
The device uses circular plug-in connectors located on the AG2 actuator base for power supply and control signalling.
Pin Assignment X1 – Circular Plug M12, 8-Pin, A-Coded (Input / Output Signals)
| Pin | Signal Assignment |
|---|---|
| 1 | Digital input + (0 to 5 V = log "0", 10 to 30 V = log "1") |
| 2 | GND for digital input and digital outputs |
| 3 | Digital output 2 + (current limitation 100 mA) |
| 4 | Digital output 1 + (current limitation 100 mA) |
| 5 | Do not connect |
| 6 | Do not connect |
| 7 | Do not connect |
| 8 | Do not connect |
Pin Assignment X3 – Circular Plug M12, 5-Pin, A-Coded (Supply Voltage & büS/CANopen)
| Pin | Signal Assignment |
|---|---|
| 1 | CAN Shield / shield |
| 2 | Operating voltage 24 V DC ±10% |
| 3 | GND / CAN_GND |
| 4 | CAN_H |
| 5 | CAN_L |
büS Configuration Interface
The büS service interface, accessible beneath the blind cover, connects to a PC using an optional USB-büS interface set (article no. 772426). Detailed diagnostics, operating hours, cycle counters, and parameter sets are accessed via the Bürkert Communicator software (Type 8920).
Operating Limits and Environmental Derating
The operational envelope of Type 3321 is governed by medium temperature, operating pressure, and ambient thermal loading:
- Operating Pressure: Maximum 16 bar(g) for DN 32 with 1300 N driving force. The overall pressure boundary follows the PN 25 rating per DIN EN 12516-1 and Class 150 per ASME B16.34.
- Seat Seal Material: PTFE seal is rated for medium temperatures up to +130 °C. For applications exceeding +130 °C, PEEK seat seals are required.
- Thermal Derating (AG2 Actuator): When equipped with the SAFEPOS energy-pack (Curve 2), the maximum allowable ambient temperature decreases at elevated medium temperatures. At a maximum medium temperature of +130 °C, the permissible ambient temperature is lower than the nominal +65 °C ceiling to safeguard actuator electronics.
SAFEPOS Energy-Pack and Manual Operation
BURKERT 20074958 includes the SAFEPOS energy-pack emergency storage module. In the event of an electrical power failure, stored energy drives the valve into the safety position (configured as normally closed). The energy pack reaches full operational charge within a maximum of 120 seconds after 24 V DC power is applied.
For commissioning, servicing, or power-off handling, the valve offers two manual override methods:
- Electrical Manual Override: With supply voltage active, set DIP switch 4 to ON (MANUAL mode) under the blind cover. Use the internal OPEN and CLOSE push buttons to position the valve. The 360° LED ring indicates the operational status, and the yellow mechanical position indicator reflects stem travel.
- Mechanical Manual Override: In a completely de-energized state, remove the dummy cover and insert a 4 mm Allen key into the mechanical override drive. Press gently to engage and rotate counter-clockwise to open the valve.
Torque Limitation on Mechanical Manual Drive
Do not exceed the maximum tightening torque of 2 Nm on the mechanical manual control. Exceeding this limit will cause mechanical damage to the internal gearing. Operate the mechanical manual control only when the device is completely de-energized.
Servicing, Torques, and X.TUNE Calibration
Replacement Part Sets for Type 3321
- Swivel Plate Set: Graphite seal, swivel plate, and dowel pin.
- Valve Set: Graphite seal, swivel plate, dowel pin, and valve seat.
- Seal Set for Packing Gland: Individual packing gland V-rings, graphite seal, and lubricant.
- Spindle Guide for Packing Gland: Spindle guide, graphite seal, and lubricant.
- SAFEPOS Energy-Pack Wearing Part (AG2): Article no. 285834.
Specified Tightening Torques for DN 32
| Fastener / Connection Location | Tool / Dimension | Specified Tightening Torque |
|---|---|---|
| Valve body to body connection (DN 32) | Open-end wrench | 65 ±3 Nm |
| Spindle guide for packing gland (spindle ∅ 10 mm) | Modified socket wrench | 6 Nm |
| Valve seat installation (DN 32, uncoated) | Seat installation tool | 80 Nm (+5 Nm) |
| Valve seat installation (DN 32, coated) | Seat installation tool | 65 Nm (+5 Nm) |
| Actuator base to housing screws (4x) | Hex key | 5 Nm (tighten crosswise) |
| Mechanical manual override | 4 mm Allen key | Maximum 2 Nm |
Lubrication Paste Recommendation
Before reassembly, grease the external thread of the body connection, the spindle guide thread, and the valve seat threads with Klüber paste UH1 96-402. For oxygen or high-purity applications, verify that only certified application-specific lubricants are used.
Recalibration via X.TUNE
After replacing the valve body or disassembling the actuator stem, run the X.TUNE calibration routine to adapt the internal position controller to the physical valve stroke:
- Ensure the piping system is completely depressurized and vented.
- Remove the dummy cover to expose the control buttons.
- Simultaneously press and hold the OPEN and CLOSE buttons for 5 seconds.
- The LED ring flashes rapidly while X.TUNE is in progress.
- When calibration completes, the LEDs return to steady illumination (AUTOMATIC mode) or standard flashing (MANUAL mode).
Never Run X.TUNE Under Process Pressure
Executing the X.TUNE routine while process medium pressure is present causes incorrect stroke calibration and uncontrolled process behavior. Depressurize and drain lines prior to initiating X.TUNE.
Accessories and Ordering Information
| Item Description | Article Number |
|---|---|
| SIM card for device parameter backup and transfer | 291773 |
| Holding device for body connection (DN 15 to DN 40) | 693770 |
| Replacement plastic blind cover | 277881 |
| SAFEPOS energy-pack replacement module (AG2) | 285834 |
| USB-büS interface set 1 (Type 8923) | 772426 |
| büS adapter cable (M12 to büS micro-USB, 0.3 m) | 774931 |
| M12 circular socket cable, 4-pin A-coded, 5 m (AG2 power supply without bus) | 918038 |
| M12 circular socket cable, 8-pin A-coded, 2 m (X1 digital I/O signals) | 919061 |
Related Products
Explore similar products in our catalog
