Burkert 2300 Series Quick Start Manual - Page 7

Browse online or download pdf Quick Start Manual for Valve Positioners Burkert 2300 Series. Burkert 2300 Series 19 pages. Remote-positioner, installation on process valves with internal air flow
Also for Burkert 2300 Series: Operating Instructions Manual (12 pages), Additional Instructions (12 pages)

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Burkert 2300 Series Quick Start Manual

Structure and function

6
STRUCTURE AND FUNCTION
The angle-seat control valve Type 2300 can be operated
only 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 incorporated directly. Via a dowel pin, the
control cone is modularly coupled to the actuator spindle for quick
changeovers. The flow direction is always below seat.
6.2
Function
The seat of the valve is always closed against the medium flow.
Spring force (CFA) or pneumatic pilot pressure (CFB and CFI) gen-
erates the closing force on the control cone. 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 pressurize the device with
pilot pressure, then switch on the medium.
A
A
Normally closed by spring action
P
B
A
Normally open by spring action
P
Typ 2300
I
A
Actuating function via reciprocal pressurization
P
6.2.2 Flow direction below the seat
Depending on the version, the valve is closed against the
medium flow with spring force (control function A, CFA) or with
pilot pressure (control function B or I, CFB or CFI).
As the medium pressure is under the control cone, this pressure
contributes to the opening of the valve.
WARNING!
Medium may be discharged if minimum pilot pressure is too
low or medium pressure too high!
If the minimum pilot pressure is too low for CFB and CFI or the
permitted medium pressure is exceeded, leaks may occur.
▶ Observe minimum pilot pressure.
▶ Do not exceed medium pressure (see chapter "Pressure
ranges").
Rest position
CFA
Fig. 1:
Flow direction below the seat
(Rest open/closed, closing against medium)
english
Rest position
CFB / CFI
7