KROHNE DK 46-47-48-800 EN - Manual (Page 35)

TECHNICAL DATA
7
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DK46 - DK800
www.krohne.com 05/2011 - 4000302403 MA DK46-800-R03-en
7.5 Differential pressure regulators
Differential pressure regulators are used to guarantee constant flow during fluctuating inlet and
outlet pressure. Minimum pressures are required to operate the regulators (see regulator
characteristics).
Differential pressure regulators are not equivalent to pressure reducing valves!
1 Inlet pressure regulators, type RE, NRE
The regulators keep the flow rate constant in the case of a variable inlet pressure and a constant
outlet pressure.
2 Outlet pressure regulator, type RA, NRA
The regulators keep the flow rate constant in the case of a constant inlet pressure and a variable
outlet pressure. There must be a pressure differential between the inlet and the outlet pressure
for the outlet pressure regulator to function. The inlet pressure p1 must always be greater than
the outlet pressure p2.
Regulator characteristics
Example - inlet pressure
regulator RE1000: Current flow rate: 1000l/h air
Outlet pressure p2 constant: 1.013 bar abs.
The flow rate in the meter remains constant with a fluctuating inlet pressure greater than 0.5 bar.
Example - outlet pressure
regulator NRA 800 Current flow rate: 800l/h air
Inlet pressure constant: 6 bar
The flow rate in the meter remains constant with a fluctuating outlet pressure of 0...5.5 bar.
1 Inlet pressure regulators, type RE and NRE 2 Outlet pressure regulators, type RA and
NRA
MA_DK46_800_R03_en_302403_PRT.book Page 35 Thursday, May 19, 2011 8:26 AM