Type 2000
Product description
13
5.2.1 Flow direction below seat
WARNING!
Valve seat leaking when control pressure is too low or medium pressure is too high.
If control pressure is too low for control function B and control function I or medium pressure is too high,
the valve seat may leak.
▶ Observe values for minimum control pressure and maximum medium pressure.
Depending on the control function, the valve closes by spring force (control function A) or pilot pressure
(control function B and I) against the medium flow.
As the medium is present under the swivel plate, the medium pressure contributes to the opening of the
valve.
Fig.2: Flow direction below seat, valve closes against medium flow
5.2.2 Flow direction above the seat
DANGER!
Risk of injury from rupturing lines and device when flow direction above the seat.
A pressure surge of liquid media may cause the lines and device to rupture.
▶ Do not use valves with flow direction above the seat for liquid media.
Flow direction above the seat is possible only on valves with control function A (closed by spring force in
rest position)
2
.
The valve closes by spring force with the medium flow. As the medium is present above the swivel plate,
the medium pressure contributes to the closing of the valve. The medium pressure also supports the seal-
ing of the valve seat.
The valve opens by the pilot pressure.
Fig.3: Flow direction above the seat, valve closes with medium flow
5.3 Device options
▪ Stroke limit
Limiting the maximum or minimum flow rate volume with an adjusting screw.
2
Not for seat size 80
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