Burkert Type 2002 - 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 control pressure (CFB and CFI)
generates 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 function (cf) for type 2000
2/2-way angle seat valve
control function (cf)
cfa
P
A
Closed by spring force in rest
position.
cfB
P
A
Opened by spring force in rest
position.
cfi
P
A
Actuating function via reciprocal
pressurization.
Tab. 2: Type 2000 - Control functions
Warning!
for control function i – danger if control 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 pressurize the device with
control pressure, then switch on the medium.
6.2.2. control function (cf) and flow
modes of operation for
type 2002, 3/2-way globe valve
In the case of the globe valve Type 2002 different operating
principles can be obtained with the same control function by
swapping the pressure and working connections.
control function a (cfa)
In rest position line connector 1 closed by spring force.
3
1
2
flow
modes of
operation
connection
1 2 3
C P A R
D R A P
E P1 A P2
F A P B
A, B: Working connections
P, P1, P2: Pressure connections
R: Pressure relief
Tab. 3: Control function A (CFA)
english
Type 2000/2002