Burkert 8691 - Page 24

24
Mechanical installation
Control function A (CFA)
Process valve closed in resting position (by spring force)
Device Pilot air outlet
2
2
2
1
or 2
2
2
1
Actuator Upper pilot air port
Lower pilot air port
Control function B (CFB)
Process valve open in resting position (by spring force)
Device Pilot air outlet
2
2
2
1
or
2
2
2
1
Actuator Upper pilot air port
Lower pilot air port
Table 2: Pneumatically connecting device and actuator CFA and CFB
Control function I (CFI)
Process valve closed in resting position
Device Pilot air outlet
2
2
2
1
Actuator Upper pilot air port
Lower pilot air port
Control function I (CFI)
Process valve open in resting position
Device Pilot air outlet
2
2
2
1
Actuator Upper pilot air port
Lower pilot air port
Table 3: Pneumatically connecting device and actuator CFI
"In rest position" means that the pilot valves of the device are isolated and not actuated.
If the ambient air is humid, a hose can be connected between pilot air outlet 2
2
of the device and the
unconnected pilot air port of the actuator for control function A and control function B. As a result, the
spring chamber of the actuator is supplied with dry air from the pilot air outlet of the device.
english
Type 8691, Rev. 2