BURKERT 338342 Type 8640 modular valve island 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, multiple 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 19 mm width per station variant utilizes Type 5470 solenoid valves, which consist of a pneumatic valve body fitted with a Type 6106 rocker pilot valve. An armature with a tilting bearing, similar to a rocker, tilts within the body of the pilot valve, and switches the valve. The minimal tilting movement of the rocker is non-wearing, and basic lubrication is unnecessary.

Structure and Description

Designation:

1. Pilot valve Type 6106
2. Exhaust port 3
3. Pressure port 1
4. Working port 4
5. Working port 2
6. Manual override
7. Cable plug Type 2506

Manual Override

To operate the valve manually, press the manual override and turn it 90° clockwise (until it stops). The manual override is locked and does not reset automatically.

WARNING

Only operate the manual override when the power is off.

Circuit Functions

Symbol	Description
C	3/2-way valve. In rest position, pressure port 1 (P/NC) closed, working port 2 (A/OUT) open after port 3 (R/NO).
D	3/2-way valve. In rest position, pressure port 1 (P/NO) open after working port 2 (B/OUT), port 3 (R/NC) closed.
G	4/2-way valve. In rest position, pressure port 1 (P) open after working port 2 (A), working port 4 (B) open after port 3 (R).

Conversion of 4/2 to a 3/2-way valve

To convert the 4/2-way valve to a 3/2-way valve, depending on the desired circuit function, close port 2 or port 4 with a stopper.

Port 2	Port 4	Circuit function
closed	open	C
open	closed	D

Technical Data

Operating Conditions

::: note Pilot pressure for pneumatic control unit depends on the pressure of the flow medium; it must be between 2 ... 10 bar (at least 70% of operating pressure). Pressure difference between port 1 and 3 of at least 2 bar. When temperatures are below 0 °C then operation is restricted to dried air. :::

Parameter	Value
Ambient temperature	-10 ... +55 °C
Medium temperature	-10 ... +50 °C
Medium	Filtered compressed air (particle size max. 10 μm), preferably unlubricated; neutral gases (5 μm filtering)
Seal material	NBR
Operating pressure range	2 ... 10 bar

Electrical Data

Parameter	Value
Electrical connection	Cable plug Type 2516 on the plug contacts of the coil (torque for fastening: 1 Nm).
Voltage tolerance	±10%
Degree of protection	IP65 (only in conjunction with cable plug Type 2516)

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.

Risk of injury due to electric shock. Switch off voltage before working on the device or system. Secure against reactivation.

Installing Multiple Blocks

1. Begin installation with 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.

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.

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.
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.