Flow Above The Seat; Flow Below The Seat - Burkert 2101 Mode D'emploi

8.3 Flow
CFA CFB/CFI

Flow below the seat

(closing against the medium)
Fig. 7: Flow below and above the seat

8.3.1 Flow above the seat

Control function A, CFA: closes by spring force against the medium
flow. Control function B, CFB: closes with the control pressure against
the medium flow. The medium pressure supports the opening of the
valve.
WARNING!
Risk of injury caused by the lines and device rupturing.
▶ Use valves with flow above the seat for gaseous media and
steam only.
To ensure complete opening, the minimum pilot pressure
must be used.
Type 2101
Start-up
CFA
Flow above the seat
(closing with the medium)
8.3.2 Flow below the seat
Control function A, CFA: closes by spring force against the
medium flow. Control function B, CFB: closes with the control
pressure against the medium flow. The medium pressure sup-
ports the opening of the valve.
WARNING!
Seat leaks caused by the minimum pilot pressure being too
low (on CFB and CFI) or the medium pressure being too high!
▶ Observe the minimum control pressure and medium pressure
(see "6.5.2").
8.4 Start-up
After installing the device, run the teach function. This function
presets the control parameters.
Description – see operating instructions for the control.
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