BURKERT 20081486 (Type 8652) is an electro-pneumatic automation valve island engineered for process automation environments. Configured as a 20-slot terminal with an anodised aluminium AirLINE Quick base adapter plate, this specific unit is factory-fitted with 20 double 3/2-way normally closed solenoid valves (circuit function C), delivering a total of 40 independently controllable pilot valve channels. The terminal includes an integrated pneumatic intermediate feed module to maintain uniform operating pressures across large valve banks, brass D 3/8" pneumatic supply connections, and brass D 1/4" working ports.

Communication is handled through an integrated Industrial Ethernet interface supporting PROFINET IO, EtherNet/IP, Modbus TCP, EtherCAT, and CC-Link IE Field Basic over dual RJ45 connectors. The unit incorporates hardware-level safety and maintenance functions, including pneumatic HotSwap check valves in supply port 1 (P) that allow live valve replacement under line pressure, and integrated check valves in exhaust ducts 3 (R) and 5 (S) to eliminate unwanted actuator motion caused by exhaust pressure spikes.

Technical Configuration of Article 20081486

Article 20081486 is manufactured according to the following specific configuration:

Parameter	Source Specification
Article Number	20081486
Valve Island Type	Type 8652 AirLINE
Number of Valve Slots	20 slots (20 PCE)
Valve Positions 1 to 20	2x 3/2-way CF-C (normally closed, servo-assisted)
Total Valve Functions	40 functions
Supply Connection (1)	Push-in connector D 3/8" (Brass)
Working Ports (2, 4)	Push-in connectors D 1/4" (Brass)
Additional Supply (Left)	Push-in connector 3/8" and 1/4"
Intermediate Feed Quantity	1 unit included
AirLINE Quick Plate Material	Anodised aluminium
Auxiliary Pilot Air	Internal
Operating Pressure Range	-1.00 bar to 10.00 bar (vacuum to 10 bar)
Pilot Pressure Range	3.00 bar to 10.00 bar
Nominal Flow Rate QNn (Air)	310 l/min (reduced by approx. 3% with HotSwap)
Communication Protocol	Industrial Ethernet (PROFINET IO, EtherNet/IP, Modbus TCP, EtherCAT, CC-Link IE Field Basic)
Hardware Interface	2x RJ45 (ports X1 and X2)
Digital Inputs	0 (without DI electronic module)
Degree of Protection	IP20 (bare) / IP65 (inside sealed cabinet with AirLINE Quick)
Ambient & Medium Temperature	-10 °C to +55 °C

General Technical Data

Parameter	Specification
Body Material	Polyamide (PA)
Seal Material	NBR and PUR
Station Width	11 mm per valve slot
Nominal Operating Mode	Continuous operation (100% duty cycle)
Switching Time Measurement	Measured according to ISO 12238
Operating Voltage	24 V DC (±10%)
Residual Ripple	1 Vss
Power Consumption per Valve	0.7 W (0.175 W after electronic power reduction)
Nominal Current per Valve	29 mA (10 mA after power reduction)
Protection Class	Class III according to DIN EN 61140, VDE 0140
Operating Medium	Oil-free or lubricated compressed dry air, neutral gases (5 µm filter recommended)
Compressed Air Quality	ISO 8573-1:2010, Class 7.4.4
Storage Temperature	-20 °C to +60 °C

AirLINE Quick Cabinet Integration

The AirLINE Quick system allows direct assembly of the valve island into the cabinet floor or cabinet wall. By routing all working lines and air supply feeds directly through the cut-out of the cabinet bottom, bulkheads and intermediate bulkhead fittings are eliminated, reducing installation footprint and assembly time.

Feature	Specification
Adapter Plate Material	Anodised aluminium (also available in stainless steel 1.4301)
Working Port Connections	Stainless steel 1.4401 or nickel-plated brass
Supply / Exhaust Ports	Push-in D 10 mm (3/8")
Working Ports	Push-in D 6 mm (1/4")
Mounting Position	Cabinet wall or cabinet floor

Installation Clearance for HotSwap

When installing the valve island inside the control cabinet, maintain the minimum clearance from the cabinet front edge and rear mounting plate as specified in the Type 8652 manual to allow valve replacement while the system remains pressurized.

Dimensions for 16-, 20-, and 24-Fold Terminals

Dimensions are stated in mm:

Variant	A	B	C	D	m	m'	n
16-fold with intermediate feed	112	224	10 x M5	114.3	7	7	4
20-fold with intermediate feed (20081486)	134	268	10 x M5	158.3	11	7	5
24-fold with intermediate feed	156	312	10 x M5	158.3	11	11	6
16-fold without intermediate feed	99	198	10 x M5	—	15	—	4
20-fold without intermediate feed	121	242	10 x M5	—	19	—	5
24-fold without intermediate feed	143	286	10 x M5	—	23	—	6

Pneumatic Safety & Switching Functions

Article 20081486 features 20 positions of Circuit Function C (2x 3/2-way solenoid valve, servo-controlled, normally closed, with manual override). Each station contains two independent 3/2-way valves within an 11 mm width, driving two process valve actuators per slice.

• Integrated Exhaust Check Valves: Located in ducts 3 (R) and 5 (S), these non-return valves prevent pressure spikes in the common exhaust lines from triggering uncommanded valve movements in other connected actuators.
• Pneumatic HotSwap Function: Integrated check valves in port 1 (P) allow any of the 20 valve slices to be unbolted and replaced under operational line pressure without shutting down adjacent processes. HotSwap implementation introduces an approximate 3% flow restriction compared to non-HotSwap variants.

Electrical & Fieldbus Connections

Electronics & Display Power Supply

Power to the internal electronics and LC display is supplied via a 5-pin spring-loaded terminal block (wire cross-section ≤ 1.5 mm²):

Pin	Colour Code	Function
1	Red	24 V DC
2	White	CAN_H (büS connection)
3	Green	Shielding
4	Blue	CAN_L (büS connection)
5	Black	GND (0 V DC)

Pneumatic Valve Power Supply

Coil power is separated from logic power and connected via a dedicated 2-pin spring-loaded terminal block on the interface plate:

Terminal	Colour Code	Assignment
1	Red	AUX 24 V DC
2	Black	GND (0 V DC)

Industrial Ethernet Interface (RJ45)

Communication ports X1 and X2 feature standard 8-pin RJ45 sockets configured for Industrial Ethernet:

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

Network Topology & Diagnostics

Type 8652 functions as an Industrial Ethernet master node on PROFINET IO, EtherNet/IP, Modbus TCP, EtherCAT, or CC-Link IE Field Basic networks, and can interconnect downstream büS valve islands as slaves.

• LC Display: Shows operational status, channel indicators, clear text messages, and standardized diagnostic symbols directly at the island.
• Controller Diagnostics: Diagnostic messages are passed cyclically and acyclically to the higher-level PLC.
• Bürkert Communicator (Type 8920): Connects via USB büS interface (set 1, part 772426) for parameter configuration, process trend visualisation, firmware updates, and full backup/restore routines.

Explosion Protection & Operating Restrictions

Type 8652 valve islands hold certifications for hazardous locations under ATEX, IECEx, CCC, and UL HazLoc:

• ATEX: BVS 20 ATEX E 031 U, II 3G Ex ec IIC Gc / II 3D Ex tc IIIC Dc
• IECEx: IECEx BVS 20.0024 U, Ex ec IIC Gc / Ex tc IIIC Dc
• North America (cURus): 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
• CCC: Certified for hazardous applications in China

Hazardous Area Usage Conditions

When installed in explosive gas or dust atmospheres:

• The valve island must be housed in an enclosure meeting EN/IEC 60079-0 with a minimum degree of protection of IP54 for gas (3G/Gc) and IP6X for dust (3D/Dc).
• The pollution degree must not exceed degree 2 according to IEC 60664-1.
• Do not connect or disconnect electrical terminals (24 V supply, SIA, EVS, DI) when an explosive atmosphere is present.
• The HotSwap function must never be used in a potentially explosive atmosphere unless the atmosphere has been proven non-explosive by gas testing instruments.
• Clean surfaces exclusively with a damp or antistatic cloth to prevent electrostatic discharge.

Compatible Accessories & Replacement Parts

Item Description	Quantity	Article No.
Replacement Valve Type 6534 (2x 3/2-way CF-C, 24 V DC)	1	301374 (Spare set REF 296031)
Dummy Valve Plate	1	335779 (REF 327614)
Height Adapter for 20-fold with intermediate feed	1	754963
Retaining Plate for 20-fold with intermediate feed (cabinet exterior)	1	60005569
Blind Plate for 20-fold with intermediate feed	1	754968
Fastening Screw Set M5 x 10 A2 DIN 6912	10	308661
5-Pin Spring-Loaded Terminal (Electronics & Display)	1	920180
2-Pin Spring-Loaded Terminal (Valve Power Supply)	1	920442
USB büS Interface Set 1 (Type 8923) for Bürkert Communicator	1	772426