Burkert 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. The valves allow different applications to be covered. Bodies and connection modules are made of high-quality plastic (polyamide) and are easy to assemble by means of the built-in snap connectors.

Key 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

Property	Value
Width per station	11 mm
Number of valve slots	Max. 24 (Max. 12 for impulse and double valves)
Maximum number of valve functions	Max. 48 (only for individual wiring and multiple connection)
Pressure range	2.5...10 bar
Temperature medium	0 °C...50 °C
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
Degree of protection	IP20 (IP65 in closed control cabinets)
Air supply connection 1 (P), 3 (R), 5 (S)	G 1/4, D 3/8
Working port	D 6, D 1/4
Installation position	As required, preferably with actuator upright

Circuit Functions

Symbol	Description
Circuit function C (CF C)	3/2-way solenoid valve Servo-controlled, with manual override Normally closed
Circuit function D (CF D)	3/2-way solenoid valve Servo-controlled, with manual override Normally open
Circuit function H (CF H)	5/2-way solenoid valve Servo-controlled, with manual override Pressure applied via port (1), therefore one of the two ports (2) or (4) is under pressure.
Circuit function L (CF L)	5/3-way solenoid valve With manual override In middle position all ports locked
Circuit function N (CF N)	5/3-way solenoid valve With manual override In middle position ports 2 and 4 exhausted
Circuit function Z (CF Z)	5/2-way solenoid valve Impulse variant with 2 coils and manual override Pressure applied via port (1), therefore one of the two ports (2) or (4) is under pressure.

Dimensions

Pneumatics 11 mm width per station

Note: Dimensions in mm, unless otherwise stated.

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

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.

Risk of injury from quickly accelerating device parts

Before applying pressure to the valve, check all hose connections and fittings for tight, secure fit.

Valve Block Installation

Standard rail installation

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

Wall installation

• Fasten the valve block directly to the wall with M4 screws.

Pneumatic Installation

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:

• Push the hose lines into the push-in connections of the solenoid valves until they come to a stop.
• Use PTFE tape or elastomer seal for sealing the threaded connection.
• Align hose lines.
• 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.