Burkert 20108896 Type 8640 is a pre-assembled 6-bank pneumatic valve block featuring a 19 mm station width, designed for DIN-rail and wall mounting in pneumatic automation systems. Configured for individual wiring without internal bus communication modules, the unit integrates 3/2-way pneumatic valve functions based on Type 5470 rocker pilot valves. It operates across an operating pressure range of 2.0 to 10.0 bar and accommodates neutral gases or compressed air at medium temperatures from 0 °C to 50 °C.

Pneumatic interconnection on this 6-bank block is routed through modular polyamide base modules, providing a shared G 1/4 supply port 1 (P) and exhaust port 3 (R), while each station directs control air through bottom-facing D6 mm push-in working ports. With standard electrical coils wired through Form C cable plugs, the valve block provides an IP20 baseline rating and reaches IP65 protection when using Type 2516 cable connectors with fitted flat seals.

Technical Specifications and Operating Limits

Specification Parameter	Value / Range
Product Type	Type 8640 Modular Valve Island Block
Article Number (SKU)	20108896
Width per Station	19.00 mm
Valve Bank Configuration	6 valve stations (6-bank)
Circuit Function	3/2-way (CF C normally closed / CF D normally open configurable)
Solenoid Valve Series	Type 5470 (fitted with Type 6106 rocker pilot)
Orifice Size (DN)	DN 4.0 mm
Flow Rate Air (QNn)	300 l/min (measured at +20 °C, 6 bar inlet, 1 bar pressure drop)
Operating Pressure Range	2.00 bar to 10.00 bar (requires min. 2 bar differential between 1 and 3)
Medium Temperature	0 °C to +50 °C (operation below 0 °C restricted to dried air)
Ambient Temperature	0 °C to +55 °C
Operating Medium	Filtered dry compressed air (particle size max. 10 μm) or neutral gases (5 μm)
Compressed Air Quality	ISO 8573-1:2010, Class 7.4.4
Supply Port 1 (P) / Exhaust 3 (R)	G 1/4 female thread
Working Connections 2 (A) / 4 (B)	Push-in coupling D6 mm (OD 6 mm)
Working Port Position	Valve bottom
Operating Voltage	24 V DC (±10% tolerance, ripple ≤ 1 Vss)
Nominal Power per Coil	1 W to 2 W
Duty Cycle	100% continuous operation
Body / Seal Materials	Polyamide (PA) / Nitrile butadiene rubber (NBR)
Degree of Protection	IP20 baseline; IP65 with Type 2516 cable plug
Mounting Standard	DIN rail EN 50022 (35 x 7.5 mm / 35 x 15 mm) or M4 wall mounting

Differential Pressure Requirement

Pneumatic switching requires a minimum pilot pressure differential between pressure port 1 (P) and exhaust port 3 (R) of at least 2.0 bar (at least 70% of operating pressure).

Valve Block Architecture and Type 5470 Solenoid Design

Each station on the Burkert 20108896 assembly incorporates a Type 5470 pneumatic valve driven by an integrated Type 6106 rocker pilot valve. The pilot system utilizes a tilting armature on a low-friction bearing pivot inside the pilot body. Because the minimal tilting movement causes negligible friction, basic lubrication is eliminated, delivering high switching stability across extended duty cycles.

Valve Station Design Elements

Item	Designation	Technical Function
1	Pilot Valve Type 6106	Rocker-action electromagnetic pilot actuation
2	Exhaust Port 3 (R)	Common manifold exhaust collector
3	Pressure Port 1 (P)	Common main air feed passage
4	Working Port 4 (B)	Station outlet connection (sealed or active depending on circuit mode)
5	Working Port 2 (A)	Station outlet connection (D6 push-in coupling)
6	Manual Override	Mechanical rotary override for manual actuation
7	Cable Plug Connection	Electrical interface for DIN EN 175301-803 Form C plugs

Manual Override Operation

Manual override allows testing without electrical energization. To actuate, push the yellow override actuator down and turn it 90° clockwise until it hits the mechanical stop. The mechanism remains locked in the active position and does not reset automatically. After manual testing, rotate the override back 90° counter-clockwise to resume electrical control.

Manual Override Operational Rule

Operate the manual override only when the electrical coil is de-energized. Prior to electrical start-up, verify that all manual override actuators across all 6 stations are returned to their zero position.

Modular Base Rail Assembly and Mounting

Burkert 20108896 utilizes modular MP05 polyamide base rail blocks linked by integrated latching hooks and tabs, sealed by elastomer O-rings between adjacent modules.

Base Module Structural Composition

Item	Designation	Functional Description
1	Left Connection Module	Pneumatic supply block with G 1/4 port connections
2	Latch Tab	Upper mating interface for interlocking adjacent base rails
3	Latch Hook	Lower hook element engaging alignment grooves
4, 6	Base Modules (3-fold / 2-fold)	Intermediate station modules housing individual valve bodies
5	Right Connection Module	End closure or secondary pressure supply terminal
7	Exhaust Channel 3 (R)	Shared exhaust manifold collector duct
8	Supply Channel 1 (P)	Shared primary pressure supply passage
9	O-Rings	Channel seals seated between adjoining modular blocks

Assembly commences from the left connection module. Before interlocking blocks, coat O-rings lightly with pneumatic-compatible grease or oil. Insert the 3 recess O-rings at the rear mating surface of each valve body before securing the valve to the base module with 2 mounting screws tightened to 0.6 ±0.1 Nm.

Mounting onto DIN Rail and Control Cabinet Panels

1. Standard DIN Rail (EN 50022 35 x 7.5 mm / 35 x 15 mm): Hook the upper mounting groove of the valve block over the DIN rail edge. Snap the bottom clamping brackets onto the lower rail flange and tighten the locking screws.
2. Wall Mounting: Fasten the block directly through designated panel holes using M4 machine screws.

Pneumatic Installation and Hose Requirements

Supply line 1 (P) and exhaust line 3 (R) use G 1/4 female threads. Station working ports 2 (A) and 4 (B) are fitted with integrated push-in couplings sized for 6 mm outside diameter (OD) pneumatic tubing.

High Pressure Hazard

Depressurize and drain all pneumatic pipework before connecting or disconnecting fittings. Flapping uncoupled air lines present severe impact hazards. Verify full tubing engagement before applying pressure.

Port Fastening Torques

Port Size	Port Designation	Recommended Torque	Maximum Permissible Torque
G 1/4	Supply Port 1 (P), Exhaust Port 3 (R)	4 to 7 Nm	20 Nm
G 1/8	Auxiliary ports and A/B station outlets	3 to 6 Nm	7 Nm

Pneumatic Hose Specifications and ISO 14743 Tensile Standards

Hose lines must possess a minimum hardness of 40 Shore D (per DIN 53505 / ISO 868) with outside diameter tolerance complying with DIN 73378 (within ±0.1 mm of nominal). Tubing must be cut square, burr-free, and inserted fully past the internal retention claws to the mechanical stop.

Hose Material	Outside Diameter (OD)	Permitted OD Tolerance
Polyamide (PA)	3 mm to 10 mm	±0.08 mm
Polyamide (PA)	12 mm to 16 mm	±0.10 mm
Polyurethane (PU)	3 mm to 8 mm	±0.10 mm
Polyurethane (PU)	10 mm to 16 mm	±0.15 mm

To ensure positive retention, push-in joints must withstand the minimum tensile forces specified in DIN ISO 14743:2020:

Tubing Outer Diameter	Minimum Tensile Force (PA Hose)	Minimum Tensile Force (PU Hose)
3 mm (1/8")	60 N	25 N
4 mm (5/32")	70 N	50 N
6 mm (1/4")	120 N	100 N
8 mm (5/16")	170 N	150 N
10 mm (3/8")	250 N	200 N
12 mm (1/2")	300 N	200 N

Tubing Retention Recommendation

For polyurethane (PU) tubing operating near dynamic thermal or pressure boundaries, install internal support sleeves (ID 20099400) to reinforce tubing wall stability inside push-in retention claws.

Electrical Installation and Cable Plug Assembly

Burkert 20108896 operates on individual wiring. Each valve position connects independently using a DIN EN 175301-803 Form C cable plug (such as Type 2516).

Electrical Connection Elements

Item	Component	Specification / Requirement
1	Flat Profile Seal	Elastomer sealing gasket between plug body and coil face
2	Cable Plug Type 2516	DIN EN 175301-803 Form C socket connector
Screw	Central Fastening Screw	Tightening torque: max. 0.3 Nm (1 Nm on coil socket base)

Electrical Safety and Earthing

Verify that the protective earth conductor is connected and seated firmly. Continuity resistance between the coil ground pin and the valve body must measure ≤ 0.1 Ω when tested at 12 V / 1 A.

Each solenoid coil can be detached and rotated by 180° by loosening the M2 retaining screws. When reinstalling the coil, tighten screws in two progressive increments: 0.1 Nm (±0.05 Nm), followed by 0.2 Nm (±0.05 Nm).

Commissioning and Troubleshooting Guide

Prior to initial operation, confirm that the supply voltage matches the coil marking (24 V DC ±10%), the air supply delivers 2.0 to 10.0 bar clean dry air, and ports 1 and 3 are not reversed.

Observed Fault	Potential Cause	Corrective Action
Valves fail to actuate	Missing or insufficient DC operating voltage	Verify voltage supply at plug terminals against type label (24 V DC ±10%).
	Manual override locked in manual position	Rotate manual override 90° counter-clockwise to zero position.
	Insufficient primary supply pressure	Confirm supply pressure is ≥ 2.0 bar with adequate volumetric air flow.
Delayed valve shifting or blow-off at exhaust	Supply pressure below operating threshold	Check for flow restrictions; maintain ≥ 2.0 bar dynamic pressure under load.
	Exhaust duct backpressure from clogged silencer	Clean or replace silencer; install larger expansion volume if required.
	Particulate contamination in pilot or seat area	Flush exhaust channels with short pressure pulses or replace contaminated pilot valve.
External air leakage at manifold	Missing or pinched O-rings between base blocks	Disassemble module joint, verify seal channels, and replace damaged O-rings.
	Deformed flat gasket between valve and base plate	Inspect valve interface seal, reseat gasket evenly, and torque M4 screws to 0.6 Nm.