Pressure Conditions In The Plant And At The Regulator - Samson 46-5 Mounting And Operating Instructions

Operation

6.2 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 results from the known pressure drop across the fully open plant and the
differential pressure created at the restriction.
The flow rate set points for water at a differential pressure at the restriction
and 0.2 bar are specified in Table 3.
Δp = Δp
set point plant
The minimum required differential pressure Δp
Δp
Δp =
set point
min +
p
1
Fig. 8: Pressure conditions in the plant
26
+ ∆p
restriction
·
(
2
)
V
Δp
min
K
VS
Δp
restriction
Δp
set point
Δp
plant
·
V
K
VS
across the valve is calculated as follows:
min
Minimum differential pressure across the valve in
bar
Differential pressure created at the restriction for
measuring the flow rate
Differential pressure set point in bar
Differential pressure (pressure loss) when the plant
is completely open in bar
Adjusted flow rate in m³/h
Valve flow coefficient in m³/h
∆p
min
∆p
set point
∆p
plant
Type 46-5
Type 46-6
Δp
restriction
∆p
restriction
or
EB 3130 EN
of 0.1
p
2