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MC • Edition 05.20 • Nº 279 663
13 … 72
7. Function
The pressure regulator has the task of maintaining con
-
stant outlet pressure despite fluctuations in inlet pressure
and/or flow. In the depressurised state, the regulator is
open. The pressure regulator meets the requirements of
EN 334 as a gas pressure regulator of the differential re
-
sistance type (DS) and zero flow rate.
Main components
A Seal
B Set point spring
C Bottom membrane enclosure
D Lever system
E Breathing connection
F Working membrane
Depressurised state
The force of the set point spring B acts on the working dia
-
phragm F. In the depressurised state, no force is acting on
the underside of membrane C since there is no overpres
-
sure in the outlet zone. The downward movement of the
working membrane presses down on the lever system D,
which pulls up from the seal A,lifting it out of place. The
regulator is open
Checked condition
As the outlet pressure increases, the force on the working
diaphragm F increases on the underside of diaphragm C.
As a result, the working membrane F is moved upwards
until the equilibrium of forces is established between the
force of the set point spring B
and that of the outlet pres-
sure. The upward movement of the working membrane F
pulls the lever system
D upwards, thus pressing the seal A
downwards, reducing the valve clearance. The minimised
flow reduces the output pressure until the set-point value
(output pressure) is reached again and the equilibrium of
forces in the working membrane is restored F.
When the outlet pressure drops, the force on the work
-
ing membrane F on the underside of the membrane C
is
reduced. As a result, the working membrane F
is moved
upwards until the equilibrium of forces is established be
-
tween the force of the set-point spring B
and that of the
outlet pressure. The downward movement of the working
membrane F
pulls the lever system
D downwards, thus
pressing the seal A upwards, reducing the valve clear
-
ance. The increased flow increases the output pressure
until the set-point value (output pressure) is reached again
and the equilibrium of forces in the working membrane is
restored
F.
Influence of changes in inlet pressure on outlet pres-
sure
Changes in the inlet pressure have a influence on the out
-
let pressure, as there is no balancing device. The ratio of
changes depends on the size of the working membrane
(fixed size) and the size of the shell (variable).
Содержание 279042
Страница 14: ...14 72 MC Edition 05 20 Nº 279 663 A B C D E A B C D E F Type UHD F Type HD ...
Страница 15: ...MC Edition 05 20 Nº 279 663 15 72 A B C D F E A B C D E F ND MD for G2 DN40 DN50 ND for G1 G1 5 y DN25 ...
Страница 43: ...MC Edition 05 20 Nº 279 663 43 72 Type UHD X Y Q S W V M C A B D E G F J K L N P H O R U I ...
Страница 45: ...MC Edition 05 20 Nº 279 663 45 72 Type ND MD for 2 DN40 DN50 M B D E G F J K L N H X Y Q S W V O I T ...
Страница 64: ...64 72 MC Edition 05 20 Nº 279 663 14 4 Tools required A B C2 D C1 ...