Structure - Burkert 8750 Quick Start Manual

Systemdescription
6.2

Structure

Actuator control
valve Type 2301
Signal line from
pressure sensor
to the process
controller
Fig. 1: Structure
6.2.1 Action diagram of the FMR
Pressure p
1
Kv value
p
1
Fig. 2: Action diagram
Typ 8750
Process controller Type 8693
Valve body control
valve Type 2301
Pressure sensor
Type 8323
Flange acc. to
DIN EN 1092-1
Pressure p
2
PV
FMR
Type
8750
p
2
6.2.2 Influence of the process variables on
the flow rate
Pressure drop
subcritical
p
1
p >
2
2
supercritical
p
1
p <
2
2
k Flow-rate coefficient [m 3 /h] 1)
V
Q Standard flow rate [m 3 /h]
N N
p Input pressure [bar] 3)
1
p Output pressure [bar] 3)
2
∆p Differential pressure
[bar]
p – p
1 2
p Density [kg/m 3 ]
p Standard density [kg/m 3 ]
N
T Medium temperature [(273+t)K]
1
english
Flow rate of gases
· ∆p
p
1
Q = 514 · k
N V T · p
1 N
p
1
Q = 257 · k
N V
T · p
1 N
1) measured for water,
∆p = 1 bar, above the
2)
device
2) Standard conditions at
1,013 bar 3) and 0 °C
(273 K)
3) Absolute pressure
9