Burkert Type 2101 - Manual (Page 10)

10
Structureandfunction
6.2 function
Depending on the version, the seat of the valve is closed with or
against the medium flow.
Spring force (CFA) or pneumatic pilot pressure (CFB and CFI) gen-
erates the closing force on the swivel plate. The force is transferred
via a spindle which is connected to the actuator piston.
6.2.1 control functions (cf)
WarninG!
for control function i – danger if pilot pressure fails!
For control function I control and resetting occur pneumatically. If
the pressure fails, no defined position is reached.
▶ To ensure a controlled restart, first pressurise the device with
pilot pressure, then switch on the medium.
control function a (cfa)
Normally closed by spring action
1(P)
2(A)
control function B (cfB)
Normally open by spring action
1(P)
2(B)
control function i (cfi)
Actuating function via reciprocal pressurisation.
1(P)
2(A)
english
Type 2101