Burkert Type 8691 - Manual (Page 15)

15
Pneumatic installation
control function a (cfa)
Process valve closed in rest position (by spring force)
Control head
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 rest position (by spring force)
Control head
Pilot air outlet 2
2
2
1
or
2
2
2
1
Actuator
Upper pilot air port
Lower pilot air port
control function i (cfi)
Process valve in rest position
closed open
Control head
Pilot air outlet 2
2
2
1
2
2
2
1
Actuator
Upper pilot air port
Lower pilot air port
Tab. 1: Pneumatic connection to actuator
8 pneumaTic inSTallaTion
Danger!
risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
procedure:
→
Connect the control medium to the pilot air port (1)
(3 – 7 bar; instrument air, free of oil, water and dust).
→
Attach the exhaust airline or a silencer to the exhaust air port (3)
(see “Fig. 9: Pneumatic connection”).
Keep the adjacent supply pressure always at least 0.5 –
1 bar above the pressure which is required to move the
actuator to its end position.
Important information for the problem-free functioning of
the device:
▶ The installation must not cause back pressure to build up.
▶ Select a hose for the connection with an adequate
cross-section.
▶ The exhaust air line must be designed in such a way that
no water or other liquid can get into the device through the
exhaust air port.
english
Type 8691