BURKERT Type 8640 modular valve island 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 advantages of the Type 8640 system include its compact design, modular configuration, and higher flexibility in the control cabinet due to AirLINE Quick compatibility. It allows for the simple exchange of valves, which is also possible during operation when equipped with the "P-shut-off" option.

General Technical Data

The Type 8640 valve island can be equipped with various pilot valves (such as Type 0460, 6524, 6525, 6526, 6527, and 5470) to suit different application requirements.

Product Properties	Type 0460, 6524, 6525	Type 6526, 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/double valves)	Max. 24	Max. 24
Pressure range	Vac...10 bar	Vac...10 bar	Vac. 2...10 bar
Nominal operating mode	Continuous operation (100% duty cycle)	Continuous operation (100% duty cycle)	Continuous operation (100% duty cycle)
Operating voltage	24 V DC (±10% tolerance)	24 V DC (±10% tolerance)	24 V DC (±10% tolerance)
Operating medium	Oil-free or lubricated compressed dry air, neutral gases (5 μm filter recommended)	Oil-free or lubricated compressed dry air, neutral gases (5 μm filter recommended)	Oil-free or lubricated compressed dry air, neutral gases (5 μm filter recommended)
Degree of protection	IP20 (IP65 in closed control cabinets)	IP20 (IP65 in closed control cabinets)	IP20 (IP65 in closed control cabinets)

Product Design and Assembly

Installing Multiple Blocks

1. Begin installation with the connection module on the left.
2. Check modules for complete installation with 2 O-rings each.
3. Lightly oil or grease all O-rings before engaging.
4. Engage the lower latch hooks of the module to be attached in the latch grooves of the preceding module. Make sure that the O-rings are properly seated.
5. Press the module to be locked upwards slightly and engage the upper latch hook.
6. Insert 3 O-rings into the recess on the back of the valve and ensure that the seal is properly fitted.

WARNING

Crushed O-rings and profile seals lead to leaky blocks. Fasten each valve to the base module with 2 screws. Recommended tightening torque is 0.6 ±0.1 Nm.

Valve Block Installation

Standard rail installation:

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

Wall installation:

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

Tightening Torques for Port Connections

Observe the following tightening torques when screwing into the port connections. The specified tightening torque may vary depending on the sealing system.

Port size	Marking/function	Recommended tightening torque [Nm]	Maximum tightening torque [Nm]
G1/4, NPT1/4	P, R/S connection	4...7	20
G1/8, NPT1/8	P, R/S connection A/B valve outlets	3...6	7

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.