BURKERT 20121116 (Type 3360) is an electromotive 2-way angle seat control valve designed for demanding continuous throttling applications where high positioning dynamic and tight shut-off are required. The assembly comprises an electromotive linear actuator (actuator size AG2) driving a stainless steel 1.4571 control cone against a PTFE seat seal via a ball screw spindle system. This specific article is configured with welded port connections according to SMS 3008 in size DN 25 (pipe dimensions 25.0 x 1.2 mm), operating on a 24 V DC supply voltage. The integrated positioner regulates the stroke with a positioning speed of 6 mm/s, an active position control dead band of ±0.1%, and a closing time of 3.3 s. Flow passes below the valve seat (direction 2 → 1), delivering a nominal flow coefficient Kv of 16 m³/h (Cv 18.7 gpm) with a modified equal percentage flow characteristic across a nominal pressure span from 0 to 25 bar(g).

Technical Specifications

Parameter	Value
Article Number	20121116
Valve Type	Type 3360 angle seat control valve
Nominal Diameter (DN / NPS)	DN 25 (NPS 1), tube dimensions 25.0 x 1.2 mm
Port Connection Type / Standard	Welded connection / SMS 3008
Flow Direction	Against closing direction (below seat, 2 → 1)
Valve Body Material	Stainless steel CF3M
Seat Seal Material	PTFE (soft seal, leakage class VI per DIN EN 60534-4)
Seat Diameter	25 mm (1")
Control Cone Material	Stainless steel 1.4571
Spindle Diameter	14 mm (stainless steel 1.4401 / 1.4404)
Nominal Pressure Rating	PN 25 (DIN EN 1333), Class 150 (DIN EN 1759)
Operating Pressure Range	0.00 to 25.00 bar(g)
Flow Coefficient Kv / Cv	Kv = 16 m³/h (water at +20 °C) / Cv = 18.7 gal/min
Flow Characteristic	Modified equal percentage (theoretical rangeability Kvs/Kv0 = 50:1)
Actuator Size / Driving Force	AG2 / 1300 N
Positioning Speed	6 mm/s (AG2 with 1300 N motor force)
Typical Closing Time	3.3 s (3300 ms)
Dead Band of Position Control	± 0.1 %
Operating Voltage	24 V DC ± 10 % (maximum residual ripple 10 %)
Operating Current	Maximum 3 A (AG2 at peak load; +2 A at minimum operating temperature)
Standby Power Consumption	2 to 5 W
Duty Cycle	100 % continuous
Safety Position on Power Loss	Blocked in last static position (fail-freeze, without SAFEPOS energy-pack)
Medium Temperature Range	-10 °C to +130 °C (operating limits for PTFE seal)
Ambient Temperature Range	-25 °C to +65 °C (without additional functional modules)
Ingress Protection	IP65 / IP67 (DIN EN 60529), NEMA 4X
Protection Class	Class III (DIN EN 61140)
Weight	Approximately 5.5 kg (AG2 actuator and DN 25 valve body)

Standards, Approvals and Conformities

BURKERT 20121116 complies with key European directives and international industrial standards:

• Food Contact Conformity: Compliant with Regulation (EC) 1935/2004 on materials and articles intended to come into contact with food, according to manufacturer declaration (variable code PL01/PL02).
• CE / EU Directives: Compliant with applicable EU Directives per the EU Declaration of Conformity.
• Pressure Equipment: Designed in accordance with DIN EN 1333 (PN 25) and DIN EN 1759 (Class 150).
• Flow & Leakage Testing: Flow testing per DIN EN 60534-2-4; leakage integrity tested to Class VI soft seal requirements per DIN EN 60534-4.
• Detergent Resistance: Cleanability verified according to Ecolab test method F&E/P3-E No. 40-1.
• Ingress Rating: Enclosure sealed to IP65 and IP67 according to DIN EN 60529, and NEMA 4X.

Materials of Construction

The wetted section and actuator assembly use corrosion-resistant materials engineered for clean industrial, chemical, and food processes.

Actuator AG2 Component Materials

Item	Component	Material
1	Blind cover (standard)	PPS (polyphenylene sulphide)
2	Actuator cover	PPS
3	Housing seal	EPDM
4	Actuator housing	Aluminium, powder-coated
6	Seal ring	EPDM
7	Actuator base	PPS

Valve Body and Wetted Trim Materials

Item	Component	Material
1	Spindle (ø 14 mm for DN 25)	Stainless steel 1.4401 (316) / 1.4404 (316L)
2	Spindle packing gland 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	Valve body seal	Graphite seal ring
6	Control cone	Stainless steel 1.4571
7	Seat seal	PTFE seal washer (clamped in stainless steel 1.4571)
8	Valve body	Stainless steel CF3M

Dimensions

Actuator Dimensions (AG2)

For DN 25 (NPS 1) with standard blind cover:

• Height H1: 334 mm (standard variant without fieldbus gateway).
• Note: The actuator raises by approximately 2 mm in the closed position when seating against the valve seal.

Welded Body Dimensions for DN 25

Dimensions for SMS 3008 and metric welded connections in mm:

• Tube outer diameter (∅ DS): 25.0 mm
• Tube wall thickness (WS): 1.2 mm
• Port weld depth / end length (ES): 26 mm
• Centreline to weld face height (CS): 43 mm
• Overall body face-to-face length (LS): 130 mm

Electrical Connections and Pin Assignments

BURKERT 20121116 uses circular M12 connectors and cable feed-through for electrical integration. Operating voltage and field communication connect through designated multi-pin ports.

Pin Assignment X1 — Input and Output Signals (M12, 8-Pin, A-Coded)

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 + (PNP, max. 100 mA)
4	Digital output 1 + (PNP, max. 100 mA)
5	Analogue output - (0/4 to 20 mA or 0 to 5/10 V)
6	Analogue output +
7	Set-point value / Analogue input - (galvanically isolated)
8	Set-point value / Analogue input + (0/4 to 20 mA, input resistance 70 Ω; 0 to 5/10 V, 22 kΩ)

Pin Assignment X3 — Operating Voltage and büS / CANopen (M12, 5-Pin, A-Coded)

Pin	Signal Assignment
1	CAN Shield / shield
2	Operating voltage +24 V DC ± 10 %
3	GND / CAN_GND
4	CAN_H
5	CAN_L

Fluidic Characteristics and Flow Curves

The modified equal percentage flow profile provides stable throttling control across a theoretical rangeability of 50:1. The initial opening region follows an engineered progression where angularity is observed starting at the KvR threshold at 5% of stroke.

Flow Progression at Progressive Valve Stroke for DN 25 (Kv in m³/h)

Valve Size	Seat Size	Actuator Force	Seat Seal	Operating Pressure	5%	10%	20%	30%	40%	50%	60%	70%	80%	90%	100% (Kvs)
DN 25	25	1300 N (AG2)	PTFE	25 bar(g)	0.34	0.36	0.62	1.5	5.2	8.9	11.5	13.0	14.2	15.4	16.0

Operating Limits and Derating Curves

Process limits are governed by the nominal pressure curve according to DIN EN 12516-1 (PN 25) and ASME B16.34 (Class 150). For PTFE soft-sealed trim, the continuous medium temperature range extends from -10 °C up to +130 °C. The valve achieves bubble-tight Class VI shut-off across this entire thermal range without requiring a downstream isolation valve.

The allowable ambient temperature depends directly on the process fluid temperature:

• Curve 1 (Devices without display module / blind cover): Ambient operating limits allow full duty cycle from -25 °C up to +65 °C when medium temperature is within 0 °C to +100 °C. If medium temperature rises toward +130 °C, the permissible ambient temperature derates to prevent motor drive overheating.

Product Architecture and Control Principles

BURKERT 20121116 uses a brushless DC electromotor coupled to an internal reduction gear and precision recirculating ball screw spindle. This converts rotational energy directly into linear thrust without pneumatic air supplies. In an unpowered standstill, the gear design maintains mechanical self-locking, keeping the valve firmly seated or positioned against maximum media pressure.

The internal non-contact displacement sensor tracks the real-time linear spindle position (POS). The built-in positioner compares POS with the set-point value (CMD) supplied via analogue input (0/4..20 mA or 0..5/10 V). When a system deviation (Xd1) occurs, the electronics drive the motor via variable CTRL until the actual valve stroke matches the command within ±0.1% dead band.

Safety Position on Power Failure

Article 20121116 is configured without the SAFEPOS energy-pack storage module. If electrical supply voltage fails, the actuator does not drive to an open or closed safety end position; instead, it remains mechanically blocked in its last current position (fail-freeze).

Local Configuration and Actuation

Local configuration is managed beneath the blind cover without requiring an external display module.

Setting the Operating Mode

1. Rotate the blind cover counter-clockwise and lift it off.
2. Locate DIP switch 4 on the actuator circuit board.
3. Configure DIP switch 4:
   • AUTOMATIC mode: Set DIP switch 4 downwards. The external set-point commands the valve, and the 360° LED ring is illuminated steadily.
   • MANUAL mode: Set DIP switch 4 upwards (ON position). The 360° LED ring flashes, and local button inputs become active.
4. Replace the blind cover and turn clockwise until the alignment marks align vertically.

Electrical Manual Jogging

Under MANUAL operating mode:

• Press and hold the OPEN button to drive the control cone towards the open position.
• Press and hold the CLOSE button to drive the control cone towards the seat.
• Observe the mechanical position indicator (yellow marker) through the transparent indicator window.

Mechanical Manual Override

De-energized Operation Only

The mechanical manual override must only be actuated in a de-energized state. Never turn the override socket while supply voltage is active.

1. Disconnect the 24 V DC power supply and wait until the 360° LED status ring extinguishes completely.
2. Unscrew and remove the blind cover.
3. Insert a 3 mm Allen key into the central manual drive socket.
4. Apply gentle axial pressure to engage the internal clutch mechanism:
   • Turn counter-clockwise to open the valve.
   • Turn clockwise to close the valve.
5. Maximum permissible tightening torque is 2 Nm. Exceeding 2 Nm upon hitting the mechanical end stop will cause internal damage to the manual gear mechanism.
6. Remove the 3 mm Allen key and remount the blind cover.

Commissioning and Stroke Calibration (X.TUNE)

Whenever the actuator is remounted onto the valve body, or if the packing gland or control cone has been serviced, the automatic X.TUNE calibration routine must be executed.

Zero Medium Pressure Required

Never run the X.TUNE function under process medium pressure. If X.TUNE is started while pipeline pressure is applied, the controller will establish incorrect mechanical stroke limits, causing uncontrolled flow or actuator failure.

Performing X.TUNE via Internal Push Buttons

1. Depressurize the piping system completely and drain lines.
2. Apply 24 V DC supply voltage to the valve.
3. Remove the blind cover.
4. Simultaneously press and hold the OPEN and CLOSE push buttons for 5 seconds.
5. The 360° LED ring lights orange continuously while the self-calibration routine executes and learns physical seat contact.
6. Once X.TUNE completes successfully, the LED illuminated ring reverts to its standard operating mode colour.
7. Reinstall the blind cover.

Maintenance and Spare Part Replacement

Actuator Removal

Residual Pressure Hazard

Before opening or disassembling the valve, isolate the line, discharge line pressure, and drain hazardous medium.

1. Set the valve to MANUAL mode and electrically or mechanically move the valve into an open position (at least 1/3 stroke open). Removing the actuator while the valve is closed will damage the PTFE seat seal.
2. Switch off the 24 V DC power supply.
3. Clamp the valve body in a holding fixture.
4. Place an open-end wrench on the hexagon flats of the body connection.
5. Unscrew the actuator assembly from the valve body and discard the old graphite seal ring.

Replacing the Control Cone (DN 25)

1. Support the cylindrical portion of the control cone in a prism fixture.
2. Using a size 5 pin punch (for spindle diameter ø 14 mm on DN 25), knock out the dowel pin with a hammer.
3. Pull the old control cone off the spindle end.
4. Slide the new 1.4571/PTFE control cone onto the spindle and align the pin holes.
5. Carefully insert a new dowel pin and tap it into the centre axis of the spindle using the hammer and pin punch.

Replacing the Spindle Packing Gland (DN 25)

1. With the control cone removed, hold the actuator base connection with an open-end wrench.
2. Engage the modified socket wrench (order no. 683223, SW21) onto the stainless steel spindle guide and unscrew it.
3. Place the spindle on a solid support and apply approximately 6 bar of compressed air to the relief bore to eject the packing gland elements.
4. Grease the replacement chevron V-rings using Klüberpaste UH1 96-402.
5. Reassemble the packing gland pack onto the spindle in the specified orientation and sequence.
6. Apply lubricant to the spindle guide threads and tighten into the body connection to a torque of 25 Nm.

Actuator Reassembly on the Body

1. Install a new graphite gasket ring on the valve body shoulder.
2. Ensure the valve drive spindle is in the partially open position.
3. Lubricate the connection threads using Klüberpaste UH1 96-402.
4. Thread the actuator onto the DN 25 valve body.
5. Tighten the body joint using a calibrated torque wrench on the wrench flats to 60 ± 3 Nm.
6. Power the unit and execute the X.TUNE calibration procedure.

Tightening Torques Reference Table

Joint Location	Fastener / Component	Tightening Torque
Body connection	DN 25 body union thread	60 ± 3 Nm (44 ± 2 lbf ft)
Spindle guide	Spindle guide ø 14 mm (DN 25)	25 Nm
Manual override	3 mm Allen key mechanical drive	Max. 2.0 Nm
Blind cover / Display module	Bayonet fastening	Rotate to align vertical marks

Ordering Chart Accessories and Spare Parts

Component Description	DN / Size	Order Article No.
Control cone set (PTFE / stainless steel, with dowel pin & graphite seal)	DN 25 (Seat 25)	170318
Packing gland seal set (PTFE V-seals, seal ring, lubricant)	Spindle ø 14 mm (DN 25 to 50)	285722
VA spindle guide for packing gland	Spindle ø 14 mm (DN 25 body)	246579
Modified socket wrench for packing gland replacement	SW21 (Spindle ø 14 mm, DN 25 to 50)	683223
Body holding clamp fixture	DN 25 to DN 50	693771
Replacement blind cover (PPS plastic)	AG2 standard	277881
M12 female cable plug, 8-pin, A-coded, length 2 m (for X1 signals)	Multi-conductor	919061
M12 female cable plug, 4-pin, A-coded, length 5 m (for X3 power)	24 V DC supply	918038
USB-büS interface set 1 (Type 8923 with PC power supply)	Service interface	772426
USB-büS interface set 2 (Type 8923 without power supply)	Service interface	772551
Recommended thread lubricant paste	Klüberpaste UH1 96-402	Available from Klüber