Burkert Type 8630 - Manual (Page 31)

8630 - 29
S
YSTEM
D
ESCRIPTION
Technical data
Actuator type Designation Safety position after
failure of auxiliary energy
Electrical Pneumatic
Single-acting down down
SFA
Single-acting up up
SFB
Double-acting down / up undefined
SFI (depending on
connection of
control
conductors)
Safety settings on failure of auxiliary electrical or pneumatic energy