BURKERT 20079040 (Type 8640) is a modular valve island for pneumatics 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

Product properties	Type 0460, Type 6524, Type 6525	Type 6526, Type 6527	Type 5470
Body Material	PA (polyamide), aluminium (Type 0460)	PA (polyamide), aluminium	PA (polyamide)
Seal Material	FKM, NBR and PUR	NBR	NBR
Width per station	11 mm	16.5 mm	19 mm
Manual override	Standard	Standard	Standard
Number of valve slots	Max. 24 (Max. 12 for impulse and double valves)	Max. 24	Max. 24
Pressure range	Vac...10 bar	Vac...10 bar	Vac. 2...10 bar
Operating voltage	24 V DC (±10%)	24 V DC (±10%)	24 V DC (±10%)
Operating medium	Oil-free or lubricated compressed dry air, neutral gases	Oil-free or lubricated compressed dry air, neutral gases	Oil-free or lubricated compressed dry air, neutral gases
Degree of protection	IP20 (IP65 in closed control cabinets)	IP20 (IP65 in closed control cabinets)	IP20 (IP65 in closed control cabinets)

Pilot Valves

The Type 8640 system can be equipped with various pilot valves to suit different application requirements:

Solenoid valves Type 6524 and Type 6525

• The pilot valves Type 6524 (single and double valve) and Type 6525 (single valve) consist of a pilot flipper solenoid valve Type 6144 and a pneumatic seat valve.
• The circuit function allows switching of high pressures with low power consumption and short switching times.
• The pilot valves are equipped with a manual override as standard.

Solenoid valves Type 0460

• The solenoid valve Type 0460 consists of a pneumatic valve body fitted with a double coil pilot valve.
• The principle allows switching of high pressures together with low power consumption and fast switching times.

Solenoid valves Type 6526 and Type 6527

• The solenoid valve Type 6526 and Type 6527 consist of a pneumatic valve body fitted with a Type 6106 rocker solenoid valve.

Solenoid valve Type 5470

• The solenoid valve Type 5470 consist of a pneumatic valve body fitted with Type 6106 rocker pilot valve. An armature with a tilting bearing, similar or a rocker, tilts within the body of the pilot valve, and switches the valve.

AirLINE Quick

AirLINE Quick considerably reduces the use of components in the control cabinet. With the AirLINE Quick Adapter, the valve terminal is adapted directly to the control cabinet floor or control cabinet wall.

Advantages:

• Reduced space requirement in the control cabinet
• This makes it possible to use more compact control cabinets
• Reduced installation effort due to hose connections directly at the bottom of the control cabinet

INFO

Type 0460 valves cannot be installed with AirLINE Quick because of their size.

Circuit Functions

Symbol	Description
C (CF C)	3/2-way solenoid valve. Servo-controlled, with manual override. Normally closed.
C (CF C)	2 × 3/2-way solenoid valve. Servo-controlled, with manual override. Normally closed.
D (CF D)	3/2-way solenoid valve. Servo-controlled, with manual override. Normally open.
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.
L (CF L)	5/3-way solenoid valve. With manual override. In middle position all ports locked.
N (CF N)	5/3-way solenoid valve. With manual override. In middle position ports 2 and 4 exhausted.
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.

Installation

Risk of injury

• 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 due to electric shock. Switch off voltage before working on the device or system. Secure against reactivation.
• Risk of injury from quickly accelerating device parts and unconnected compressed air hoses flapping around. Before applying pressure to the valve, check all hose connections and fittings for tight, secure fit.

Valve block installation

Standard rail installation:

1. Hook the valve block with the upper groove into the 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

Breaking hazard

• Do not use the coil as a lever arm.
• Do not use a pipe wrench when screwing in.

1. Check the hose lines for contamination and clean them.
2. If necessary, install dirt traps upstream of the valve inlet (≤ 5 µm).
3. Push the hose lines into the push-in connections of the solenoid valves until they come to a stop.
4. Use PTFE tape or elastomer seal for sealing the threaded connection.
5. Connect the supply and working lines to the valve block.

Maintenance and Troubleshooting

Fault	Possible cause	Remedy
Valves do not switch	No operating voltage or operating voltage too low	Check electrical connection. Ensure operating voltage according to type label.
	Manual override not in zero position	Bring manual override to zero position.
	Pressure supply insufficient or not available	Set up large-volume pressure supply. Minimum operating pressure ≥ 2 bar.
Valves switch with a delay or blow off at the exhaust ports	Pressure supply insufficient or not available	Set up large-volume pressure supply. Minimum operating pressure ≥ 2 bar.
	Valves are not in the home position (de-energised) during pressure build-up	Apply pressure to the valve block before the valves are switched.
	Insufficient ventilation of the exhaust air ducts due to too small or dirty silencers	Use suitably sized silencers or expansion vessels. Clean the dirty silencers.
	Impurities or foreign matter in the pilot or pneumatic valve	Apply pulsed pressure to the exhaust air ducts to blow out the impurities. Install a new pilot or pneumatic valve.
Leaky valve blocks	Missing or crushed O-rings between the modules	Identify leak or missing seals.
	Missing or incorrectly positioned flat seals between valve and base plate	Insert missing seals or replace damaged seals.