BURKERT 20050987 (Type 8640) is a modular valve island for pneumatics. The Type 8640 valve unit system is designed to solve diverse and complex control problems due to its systematic modular construction and combination of pneumatic and electrical interfaces. By putting together a row of pneumatic modules with different numbers of valves, 2 to 24 valve functionalities may be realized on one valve unit. Electrical connectivity is achieved by either fieldbus interfaces, common connection (parallel connection technique) or multipin interfaces. Bodies and connection modules are made of high-quality plastic (polyamide) and are easy to assemble by means of the built-in snap connectors.

Features

• Compact design
• Modular configuration
• Higher flexibility in control cabinet due to AirLINE Quick
• Simple exchange of valves (with option "P-shut-off" – also possible during operation)

General Technical Data (11 mm Width)

Product properties	Type 0460, Type 6524, Type 6525 (11 mm)
Body Material	PA (polyamide), aluminium (Type 0460)
Seal Material	FKM, NBR and PUR
Width per station	11 mm
Manual override	Standard
Number of valve slots	Max. 24 (Max. 12 for impulse and double valves)
Pressure range	Vac...10 bar
Operating voltage	24 V DC (±10% tolerance)
Degree of protection	IP20 (IP65 in closed control cabinets)
Working port	D 6, D 1/4
Air supply connection 1 (P), 3 (R), 5 (S)	G 1/4, D 3/8
Ambient temperature	0 °C...+ 55 °C (when using Type 0460: 0 °C...+ 50 °C)

Product Variants: Revision 3 (REV3)

The pneumatic basic and connection modules have been optimised in the REV3 generation. The 20050987 model is a REV3 configuration.

Feature	Type 8640 REV3
Visual distinction 11 mm
Channel arrangement of the working connections	Wavy
Colour of the release rings (hose connector)	Blue
Flow reduction with integrated P shut-off	Up to 20 %

Product Design and Assembly

Pneumatics 11 mm width per station

No.	Element
1	Pneumatic connection module, left
2	Basic pneumatic modules
3	Pneumatic connection module, right
4	Valves (for example 5/2-way)

Installation

WARNING

Risk of injury due to unintentional activation of the system and uncontrolled restart.

• Secure the system against unintentional activation.
• Following installation, ensure a controlled restart.

Valve Block Installation

Standard rail installation:

1. Hook the valve block with the upper groove into the standard rail (Standard rail 35 x 15 or 35 x 7.5 EN 50022).
2. Snap the lower clamping pieces into the standard rail.
3. Tighten the screws on the clamping pieces.

Wall installation: Fasten the valve block directly to the wall with M4 screws.

Pneumatic Installation

DANGER

Risk of injury due to high pressure and escaping medium.

• Switch off the pressure before working on the device or system. Vent or drain the pipes.

Before connection:

• Check the hose lines for contamination and clean them.
• If necessary, install dirt traps upstream of the valve inlet (≤ 5 µm).

Pneumatic connection:

1. Push the hose lines into the push-in connections of the solenoid valves until they come to a stop.
2. Use PTFE tape or elastomer seal for sealing the threaded connection.
3. Align hose lines.
4. Connect the supply and working lines to the valve block.

Requirements for hose lines:

• Minimum hardness 40 Shore D (according to DIN 53505 or ISO 868).
• Outer diameter according to DIN 73378 (maximum permissible deviation ± 0.1 mm from nominal dimension).
• Burr-free, cut off at right angles and undamaged on the outer diameter surface.

Recommended Action for Push-in Connectors

Ensure that the appropriate combination of hose material (polyamide or polyurethane) and push-in connector is used, as different materials require different holding forces. Press the hose into the push-in connector with sufficient force. The hose must be inserted deep enough into the push-in connector so that it is held correctly by the claws.

Minimum tensile force for the tensile test (DIN ISO 14743:2020):

Hose OD, D, mm	3	4	6	8	10	12	16
Minimum tensile force for polyamide hose (PA), N	60	70	120	170	250	300	350
Minimum tensile force for polyurethane hose (PU), N	25	50	100	150	200	200	300