BURKERT 20021784 (Type 8652) is an AirLINE modular pneumatic valve island configured with 24 valve slots, each equipped with a 5/3-way servo-controlled solenoid valve with middle position closed (Circuit function L). Built for process automation cabinets, this configuration incorporates an anodised aluminium AirLINE Quick adapter plate, allowing direct mechanical feedthrough and pneumatics connection through the floor or wall of a control cabinet. The assembly features an integrated ME43 fieldbus gateway communicating via multiprotocol Industrial Ethernet, which supports PROFINET IO, EtherNet/IP, Modbus TCP, EtherCAT, and CC-Link IE Field Basic over dual RJ45 Ethernet ports.

Pneumatic working ports are sized at D6 mm brass push-in fittings, while primary air supply ports use D10 mm brass push-in fittings. With an internal auxiliary pilot air path, the unit operates across a process pressure span from -1 bar vacuum up to 10 bar, backed by a required pilot pressure range of 3 to 10 bar. A central pneumatic intermediate feed module is integrated directly between the valve blocks to maintain consistent air delivery across all 24 stations. An integrated LC display provides device status, diagnostics, and channel conditions in clear text and graphic symbols directly at the cabinet.

Technical Specifications

Technical Parameter	Specification / Value
Manufacturer Model Number	20021784
Valve Island Type	Type 8652 AirLINE
Total Valve Stations	24 slots (all occupied by CF-L valves)
Valve Width per Station	11 mm
Intermediate Air Feed Module	1 PCE (integrated between valve groups)
Body Material	PA (Polyamide)
Seal Materials	NBR and PUR
AirLINE Quick Plate Material	Anodised aluminium
Supply Port Connection / Material	Push-in D10 mm / Nickel-plated brass
Working Port Connection / Material	Push-in D6 mm / Nickel-plated brass
Auxiliary Pilot Air	Internal supply
Operating Pressure Range	Vacuum to 10 bar (-1.00 bar to 10.00 bar)
Auxiliary Pilot Air Pressure	3 bar to 10 bar
Standard Air Flow Rate QNn	310 l/min (275 l/min for CF-L middle position closed)
Nominal Operating Voltage	24 V DC (±10%, residual ripple 1 Vss)
Coil Power per Valve	0.7 W nominal (0.175 W after electronic power reduction)
Coil Current per Valve	29 mA nominal (10 mA after electronic power reduction)
Operating Medium	Oil-free or lubricated dry compressed air, neutral gases
Compressed Air Quality	ISO 8573-1:2010, Class 7.4.4 (5 µm pre-filtering recommended)
Ambient & Medium Temperature	-10 °C to +55 °C
Storage Temperature	-20 °C to +60 °C
Electrical Protection Class	Class III according to DIN EN 61140, VDE 0140
Ingress Protection Rating	IP20 (open terminal) / IP65 (cabinet bottom installation via AirLINE Quick)

AirLINE Quick Adapter System

The AirLINE Quick adapter plate eliminates conventional bulkheads, tubing loops, and panel feedthrough connectors inside the control cabinet. By attaching the Type 8652 base directly against an aperture in the cabinet floor or side wall, all primary pneumatic supply lines and valve working lines connect on the exterior bottom face.

Key physical features of the AirLINE Quick interface include:

• Space minimization inside the enclosure, permitting smaller cabinet enclosures.
• Reduction of internal pneumatic piping and installation labor.
• Dual seal perimeter establishing an IP65 enclosure seal against environmental dust and liquid ingress.
• External pneumatic push-in fittings: D10 mm (3/8") for main air supply (Port 1) and exhaust collecting lines (Ports 3 and 5); D6 mm (1/4") for working ports (Ports 2 and 4).

Circuit Function Configuration

Article 20021784 is fully loaded across all 24 slots with Type 6534 solenoid valves running Circuit Function L (CF-L). Each valve slice has a width of 11 mm and incorporates an integrated mechanical manual override with spring return and latching function.

• Circuit Function L (CF-L): 5/3-way servo-controlled solenoid valve. In the de-energized middle position, all ports (1, 2, 3, 4, and 5) are hermetically blocked, preventing cylinder drift or actuator movement upon power interruption.
• Nominal Flow Rate: 275 l/min measured at +20 °C, 6 bar inlet pressure, and 1 bar differential pressure.
• Response Switching Times: Opening time 15 ms, closing time 15 ms according to ISO 12238.

Alternative Valve Functions Supported by Type 8652 Platform

While article 20021784 is built exclusively with CF-L valves, individual valve stations can be reconfigured or serviced using alternative Type 6534 slices, including CF-C (single 3/2-way NC), 2x 3/2-way NC (CF-C), 2x 3/2-way NO (CF-D), 5/2-way single-solenoid (CF-H), 5/2-way bistable impulse (CF-Z), 5/3-way center ventilated (CF-M), and 5/3-way center exhausted (CF-N).

Dimensions and Mounting Footprint

The 24-valve configuration with an intermediate supply block requires specific panel cutouts and mounting hole spacing for control cabinet floor integration.

Valve Island Variant	A (mm)	B (mm)	C (Fasteners)	D (mm)	m	m'	n
16-fold with intermediate supply	112	224	10 x M5	114.3	7	7	4
20-fold with intermediate supply	134	268	10 x M5	158.3	11	7	5
24-fold with intermediate supply (20021784)	156	312	10 x M5	158.3	11	11	6
16-fold without intermediate supply	99	198	10 x M5	—	15	—	4
20-fold without intermediate supply	121	242	10 x M5	—	19	—	5
24-fold without intermediate supply	143	286	10 x M5	—	23	—	6

Electrical and Fieldbus Connections

The valve island utilizes separate electrical supplies for internal electronics/communication and valve coil actuation. This guarantees that an emergency stop or safety trip on the valve coil supply does not cut bus communication or display diagnostics.

Power Supply Connections

1. Electronics and Communication (5-Pin Spring-Loaded Terminal):

   • Pin 1 (Red): +24 V DC logic power
   • Pin 2 (White): CAN_H (büS connection)
   • Pin 3 (Green): Shielding
   • Pin 4 (Blue): CAN_L (büS connection)
   • Pin 5 (Black): 0 V DC (GND)
   • Maximum wire cross-section: ≤ 1.5 mm²

2. Pneumatic Valve Actuation Power (2-Pin Spring-Loaded Terminal):

   • Pin 1 (Red): AUX +24 V DC
   • Pin 2 (Black): 0 V DC (GND)

Industrial Ethernet Interface (X1 and X2 RJ45)

The integrated ME43 fieldbus gateway provides two MDI/MDI-X 100BASE-TX RJ45 ports (X1 and X2) supporting daisy-chain and ring network topologies.

RJ45 Pin	Signal Assignment
1	TX+ (Transmit Data +)
2	TX- (Transmit Data -)
3	RX+ (Receive Data +)
4	Not connected (N.C.)
5	Not connected (N.C.)
6	RX- (Receive Data -)
7	Not connected (N.C.)
8	Not connected (N.C.)

Installation Guidelines in the Control Cabinet

When positioning Type 8652 on a cabinet floor or mounting pan, specific spatial clearances must be maintained relative to the front door and sidewalls to permit valve replacement and access to the manual overrides.

Panel Cutout Fastening

Use screw set M5 x 10 A2 DIN 6912 (article number 308661) to secure the aluminium AirLINE Quick adapter plate into the control cabinet floor. Verify that the continuous base gasket is fully seated before tightening.

Product Architecture and Modular Networking

Type 8652 is built on the Bürkert EDIP (Efficient Device Integration Platform) architecture. The valve manifold consists of an interface module, pneumatic supply blocks, 4-valve sub-bases, valve slices, and an ME43 head module.

In multi-island environments, an Industrial Ethernet-equipped Type 8652 acts as a master communication gateway, networking secondary AirLINE 8652 islands over local büS (CANopen-based) links without extra PLC communication modules.

Approvals and Hazardous Area Standards

Type 8652 valve islands conform to European and international standards for industrial automation. Depending on plant certification requirements, specific model executions cover hazardous area installation:

• CE / EU Directives: In accordance with the EU Declaration of Conformity.
• ATEX / IECEx Zone 2/22 (Category 3G/3D):
  • Certificate: BVS 20 ATEX E 031 U / IECEx BVS 20.0024 U
  • Marking: II 3G Ex ec IIC Gc / II 3D Ex tc IIIC Dc
• North America (cURus / cULus):
  • UL 61010-1 / CAN/CSA-C22.2 No. 61010-1 (Electrical safety)
  • HazLoc: Class I, Zone 2, AEx ec IIC Gc / Class II, Zone 22, AEx tc IIIC Dc / Class I, Division 2, Groups A, B, C, D; Class II/III, Division 2, Groups F, G
• China Compulsory Certification (CCC): Certified explosion-proof product according to GB/T 3836 series standards for hazardous applications.
• Enclosure Rating: Type 4X according to NEMA 250 in closed stainless steel enclosures.

Hazardous Area Operational Restrictions

When installed in explosive gas or dust atmospheres (Zone 2/22 or Div 2), electrical terminals and plugs must only be connected or disconnected in a completely de-energized state. Pneumatic Hot Swap operation is prohibited while an explosive atmosphere is present unless the area is proven non-hazardous with certified measurement equipment.

Compatible Accessories and Replacement Parts

| Component Description | Characteristic / Specification | Article Number | | :--- | :--- | :---: | | | Type 6534 Replacement Valve CF-L | 5/3-way mid position closed, 24 V DC (spare for 20021784) | 301380 | | Type 6534 Replacement Valve CF-C | 3/2-way NC, 24 V DC | 20102334 | | Type 6534 Replacement Valve 2x 3/2-way CF-C | 2x 3/2-way NC, 24 V DC | 301374 | | Type 6534 Replacement Valve 2x 3/2-way CF-D | 2x 3/2-way NO, 24 V DC | 301375 | | Type 6534 Replacement Valve CF-H | 5/2-way single solenoid, 24 V DC | 301376 | | Type 6534 Replacement Valve CF-Z | 5/2-way bistable impulse, 24 V DC | 301377 | | Type 6534 Replacement Valve CF-M | 5/3-way center ventilated, 24 V DC | 301379 | | Type 6534 Replacement Valve CF-N | 5/3-way center exhausted, 24 V DC | 301381 | | Type 6534 Dummy Valve Slice | Blanking plate for unused valve positions | 335779 | | Power Plug 5-Pin | Spring-loaded terminal for electronics & communication | 920180 | | Power Plug 2-Pin | Spring-loaded terminal for pneumatic valve coil supply | 920442 | | Fastening Screw Set | 10x M5 x 10 A2 DIN 6912 for AirLINE Quick cabinet attachment | 308661 | | Height Adapter 24-fold | Adapter plate with intermediate feed module | 754964 | | Retaining Plate 24-fold | Exterior cabinet mounting with intermediate feed module | 60005570 | | Blind Plate 24-fold | Sealing cover with intermediate feed module | 754969 | | Fieldbus Gateway ME43 Industrial Ethernet | Replacement PROFINET, EtherNet/IP, Modbus TCP, EtherCAT | 301799 | | USB-büS Interface Set 1 | Hardware kit for PC Bürkert Communicator software (Type 8920) | 772426 |