SKPx5.xxxUx
Electro
Ͳ
hydraulic
actuators
Technical
Instructions
Document
Number
CC1N7643us
December
10,
2018
Siemens
AG
Building
Technologies
Page
11
Operation
continued
(see
Figure
2)
Regulating
function
SKP25.xxxUx
The
outlet
gas
pressure
sensing
line
is
connected
to
the
pressure
regulator
housing.
The
outlet
pressure
acts
on
the
regulator
diaphragm.
The
diaphragm
is
opposed
by
an
adjustable
setpoint
spring
force,
which
represents
the
desired
gas
pressure
value.
The
movement
of
the
diaphragm
modulates
a
hydraulic
bypass
valve
connecting
the
pressure
chamber
to
the
hydraulic
fluid
reservoir.
When
the
outlet
gas
pressure
is
lower
than
the
desired
value,
the
bypass
valve
is
closed
by
the
movement
of
the
diaphragm,
causing
the
actuator
piston
to
open
the
gas
valve.
The
opposite
occurs
when
the
outlet
gas
pressure
is
higher
than
the
desired
value;
the
diaphragm
moves
to
open
the
bypass
causing
the
actuator
piston
to
close
the
gas
valve.
The
movement
of
the
actuator
piston
stops
once
the
outlet
gas
pressure
is
equal
to
the
setpoint.
In
this
position
the
bypass
valve
is
partially
open
so
that
the
oil
flow
supplied
by
the
pump
is
identical
to
the
return
flow.
Unlike
the
conventional
direct
acting
regulators,
the
SKP25.xxxUx
servo
operated
regulating
system
displays
virtually
zero
droop
(offset)
across
the
turndown
range.
The
SKP25.0xxUx
models
may
be
applied
as
a
1:1
air/gas
proportionator
or
as
a
zero
governor.
For
either
application,
the
standard
spring
has
to
be
replaced
with
AGA28
spring,
which
allows
adjusting
the
bias
between
+0.4"
to
Ͳ
0.4"
w.c.
For
proportionator
operation,
the
air
pressure
sensing
line
must
be
connected
to
the
port
marked
“AIR".
High
bias
model
SKP25.611U1
is
a
1:1
air/gas
proportionator
with
a
factory
installed
spring
for
0.4"
to
Ͳ
4.0"
w.c.
bias.
)
NOTE:
1.
To
avoid
oscillation,
do
not
oversize
the
VGxxx.xxxU
valve
body
(see
Technical
Instructions,
N7636us
and
N7631us).
2.
SKP25.4xxUx
models
must
not
be
used
as
proportionators.
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