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Operation
7.2 Pressure conditions in the plant and at the regulator
On selecting the differential pressure set point or set point range, note that the differential
pressure set point (
Δp
(
) and the differential pressure created at the restriction (
Δp
plant
The minimum required differential pressure Δp
Δp
= Δp
min
set point
p
1
Fig. 7-4: Pressure conditions in the plant
7-4
) results from the known pressure drop across the fully open plant
set point
Δp
set point
·
(
2
)
V
Δp
min
+
Δp
K
restriction
VS
Δp
set point
Δp
plant
K
VS
= Δp
+ ∆p
plant
restriction
across the valve is calculated as follows:
min
Minimum differential pressure across the valve in bar
Differential pressure at the restriction in bar
Differential pressure set point in bar
Differential pressure (pressure loss) when the plant is
completely open in bar
Valve flow coefficient in m³/h
∆p
min
∆p
set point
∆p
plant
Type 45-1,
Type 45-2,
Type 45-3 or
Type 45-4
). See Fig. 7-4.
Δp
restriction
∆p
restriction
p
2
EB 3124 EN
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