Structure And Function - bürkert 2300 Kurzanleitung

Structure and function

6 STRUCTURE AND FUNCTION
The Type 2300 Y-type control valve can only be used in
combination with the following control units:
Positioner Type 8692, 8694, 8696 and 8792;
Process controller Type 8693 and 8793.
6.1 Structure
The valve seats are directly integrated. The control cone is mod-
ularly connected to the actuator spindle via a spring-type straight
pin, and can thus be quickly replaced. The flow direction is always
below the valve seat.
6.2 Function
The valve seat is always closed against the medium flow. Spring force
(CFA) or pneumatic pilot pressure (CFB and CFI) generate the closing
force on the control cone. A spindle connected to the actuator piston
transmits the force.
6.2.1 Control functions (CF)
WARNING!
For control function I – risk of pilot pressure failure!
With control function I, the control unit and reset are pneumatic. No
defined position is reached during a pressure failure.
▶ To ensure a controlled restart of the device, first apply pilot pres-
sure and then activate the medium.
Type 2300
A
A
Closed by spring force in rest position
P
B
A
Opened by spring force in rest position
P
I A
Actuating function via reciprocal pressurisation
P
6.2.2 Flow direction below seat
Depending on the variant, the valve is closed against the medium
flow either with spring force (CFA) or pilot pressure (CFB and CFI).
Because the medium pressure is below the control cone, it helps
open the valve.
WARNING!
Valve leak if there is too little minimum pilot pressure or high
medium pressure!
Minimum pilot pressure for CFB and CFI that is too low, or failing
to meet the permitted medium pressure, can cause a leak in the
valve seat.
▶ Adhere to minimum pilot pressure.
▶ Do not exceed the medium pressure (see "Pressure ranges").
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