VGD
Series
Double
Valves
Technical
Instructions
Document
Number
CC1N7631us
November
08,
2017
Siemens
AG
Building
Technologies
Division
Page
7
Specifications
Physical
characteristics
Body
materials
See
Table
2
Weight
See
Tables
4
Connections
Pipe
connections
NPT
threads
or
ANSI
class
150
flanges
(see
Table
2
)
Pressure
and
vent
taps
See
Tables
2
and
3
Operation
All
VGDxx.xxxU
gas
valves
are
normally
closed,
two
‐
way
valves.
The
valves
have
a
standard,
integral,
stainless
steel
mesh
filter
(0.9
mm)
in
the
inlet
to
protect
the
downstream
components
against
contamination.
All
valves
have
¼
NPT
ports
for
pressure
test
connection.
A
full
size
vent
connection
plate
is
available
as
an
accessory
for
VGD40.xxxU
valves.
See
Table
2
and
3
for
details
on
ports
and
vent
connection
plates.
AGF10...
AGF10...
7631z50us/0815
Figure
1.
Sectional
view
of
VGD20.xxxU
VGD20.xxxU
double
valves
consist
of
two
valves
in
series.
The
first
(inlet)
valve
has
a
flat
valve
disc
suitable
for
the
safety
shut
‐
off
function
only.
The
second
(outlet)
valve
has
a
contoured
valve
disc
for
stable
regulating
control
and
smooth
release
of
gas.
