Burkert 2301 Series Snelstarthandleiding - Pagina 7
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Structure and function
6
STRUCTURE AND FUNCTION
The globe control valve Type 2301 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 screwed in. A reduction in the orifices of the
seats can be achieved by simply exchanging the threaded seats.
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)
generates 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
Type 2301
B
A
Normally open by spring action.
P
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").
CFA
Fig. 1:
Flow direction below the seat
(Rest open/closed, closing against medium)
english
CFB / CFI
7