Brochure CM

CM
series
Pneumatic actuators
Total capability in valve actuation
CM control drive actuators
CML
Control drive enclosed actuator
with lever manual override
■ CML-2
The pneumatic actuator system
CML series is composed by an
actuator and a manual override
integrated into a steel housing
which works also as a carrying
structure.
This rugged construction
guarantees continuous operation
in harsh environments, it is used
in power stations, steel industries,
petrochemical plants, desert
areas, etc.
This actuator provides from
small to medium torques (up to
CMV
Control drive large enclosed actuator
with automatic engaged manual override
■ CMV-1
2 - CM series
The pneumatic actuator system
CMV series is composed by an
actuator and a manual override
integrated into a steel housing
which works also as a carrying
structure.
This rugged construction
guarantees continuous operation
in harsh environments, it is used
in power stations, steel industries,
petrochemical plants, desert
areas, etc.
This actuator is able to control
final elements like dampers,
hydraulic converters, etc. using
high power actuators to develop
torque up to 4.000 daNm.
In this actuator, the housing
provides a double function of
protection and bearing frame.
This system assures maximum
stiffness without making use of
DESIGN & MAIN FEATURES
Air supply:
dry instrument air according to
ISO 8573-1
Operating pressure:
Pneumatic version from 7 barg
up to 10 barg (special version
available on request)
Standard operating temperature:
-20°C to 70°C (lower or higher
temperature on option)
100 daNm) for angular control of
dampers, butterfly valves, speed
variators, radial vanes, etc.
The hand operator is a clutchable
lever, equipped with a mechanical
system. This system allows the
movement of the actuator through
an external lever and lock it in the
required position.
The front part of the housing
is easily removable to allow
maintenance and access to all
components.
Available with a wide range of
positioners, in particular we
suggest FT positioners (see FT
brochure for more information)
CML
Working lever operating angle:
- 63/125 and 100/100 ➞ 90°
- 100/200 and 125/200 ➞ 70°
CMV
Working lever operating angle:
70°
Lever orientation variable on
splined shaft
Mechanical position indicator
Control signal:
4 to 20 mA (3 to 15 psi)
(special cam and/or special
control signal available on
request)
additional supporting structures;
consequently, the whole volume
inside the housing is available
for the most rational installation
of the actuator and the various
accessories.
Inspection is assured by large
removable panels.
The shaft equipped with an
external lever has an operating
angle of 70° and is fitted, at its
two terminals, with a splined joint
which allows the most convenient
orientation of the control lever.
The engaging of the manual
control is made automatically or
manually through a dedicated
switch, when air fail and lock
actuator on last position ready for
manual control.
CM series - 3
CM control drive actuators
Advantages
1 It can work in harsh environment maintaining
excellent performance.
2 No competitors have so wide range.
3 Manual override built-in as standard.
4 Easy installation of a wide range of accessories
on a separated internal panel.
5 Easy maintenance.
6 Design for a long operating life.
7 Internal SC actuator with built-in permanent
lubrication system
(see SC brochure for more information).
8
CML-2
The picture shows a typical CML actuator in on-off
execution for open and close damper on power
station cooler equipment.
Balancing Security Sensor device (BSS)
allows to switch automatically from manual
function to modulating with signal
(after request to come in service) only when the
signal matches position where actuator
is mechanically lock from manual override.
BSS is available as an option only for CMV
actuator.
Actuator with piston built-in permanent lubrication system
SC series of actuators are provided with
a built-in permanent lubrication system,
patented by STI, which assures an extremely
smooth valve operation even if dry instrument
air is used. Thanks to this lubrication system,
which is common to all STI actuators, no
maintenance to the moving parts is required,
4 - CM series
even after many years of continuous service.
The patented lubrication system consists
mainly of a grease lubricant filled annular
cavity placed inside the cylinder piston,
between a sealing ring and a sliding ring
to avoid direct contact between the metal
surfaces of the piston and the cylinder, even
70°
MAX. TORQUE
MIN. TORQUE
Further information and specific
technical support may be obtained
by contacting STI sales organization.
Actuator
Type
CML-1
CML-2
CMV-1
CMV-2
CMV-3
CMV-4
Size
stroke
mm
63/125
100/100
100/200
125/200
70°
12
26
52
82
125/250
160/200
200/200**
160/300
200/300
260/300
260/400
330/400
390/450
420/450
520/450
101
134
188
201
317
540
720
1179
1909
2193
3361
Torque* available [daNm]
min
max
90°
70°
8
14
18
32
36
63
57
100
72
94
132
141
224
380
507
830
1316
1531
2320
124
164
230
246
389
662
882
1444
2337
2678
4119
TECHNICAL DATA
CM actuators has a 70° lever
operating angle. Rotation of final
control element depends on lever
length and installation linkage design
(normally between 70° and 90°
rotation but it can be different).
Rotation angle has an influence
on torque available on final control
element. In the table are shown
available thrust for control element
when rotation is 70° or 90° as
examples (they are the more
common). For different rotation
angle/installation linkage design a
calculation needs to be done.
MIN. TORQUE
CML
Housing
carbon steel
Lever shaft
alloy steel 38 NiCrMo4 heat
treated
Shaft support
bronze bushing on bearing
External lever
carbon steel
Manual override
manual by-pass function for
manual override using an external
lever
Tubing & fittings
brass fittings and copper tubing
(stainless steel 316 available on
option)
Standard painting
RAL 7030 grey
90°
12
26
51
81
101
133
187
200
316
538
717
1174
1881
2171
3314
* Torque referred at 0,50 Mpa supply pressure and 70° or 90° operating angle of final
element (damper).
** Max operating air supply pressure 0,44 Mpa.
CMV
Housing
carbon steel
Lever shaft
alloy steel 38 NiCrMo4 heat
treated
Shaft support on bearing
bronze for CMV-2 to CMV-4
spherical joints for CMV-1
External lever
carbon steel
Manual override
pneumatic by-pass function for
manual override using an external
lever
Bearing frame
carbon steel
Manual control screw
alloy steel 38 NiCrMo4 heat
treated
Tubing & fittings
brass fittings and copper tubing
(stainless steel 316 available on
option)
in case of lateral forces acting on
the actuator stem; the annular cavity
is filled of grease which, during the
piston movement, keeps the metal
parts lubricated allowing a very
smooth sliding and long seal life.
Standard painting
RAL 7030 grey
Available special executions.
We are specialized in customized
products.
CM series - 5
CM control drive actuators
CMV-2
The picture shows an example of CMV-2
with some STI products such as cylinder,
positioner and accessories.
FT positioner
FasTrak is a smart positioner
and it has a high-capacity and
high-precision digital-pneumatic
valve controller that replaces a
conventional positioner.
Air-lock device
This item is mounted on
pneumatic actuators when
they need to be isolated from
control devices (positioners,
electro-pneumatic distributors,
etc.) in the event air pressure
falls below the pre-determined
operating safety point.
6 - CM series
ACCESSORIES
FasTrak
High performances smart,
2 wires, positioner
Electronic Position
Transmitter +
Limit Switch
The enclosure for electronic
position transmitter (model 2030)
has also the capability to house a
wide range of either mechanical or
inductive limit switches (up to 4).
High flow rate (Cv=2)
Hart protocol
Integrated position transmitter
Intrinsically safe and explosion proof
(ATEX, IECEX, GOST, FM, CSA)
Remote mounting option
Fail freeze option (2 wires)
DD files for 375/475 and AMS
available
Display and push buttons on
option
SA/CL
Pneumatic and electro-pneumatic
positioner
Air supply:
1/4” NPTF for SA/CL-2
1/2” NPTF for SA/CL-1-1/2
Input signal: 4 to 20 mA / 3 to
15 psi (special ranges on request)
Material: aluminum
Min. stroke: 70 mm
Signal: 1/4” NPTF
Standard cam: linear (quadratic
available on request)
Advanced Diagnostic
Partial stroke
test & dynamic error
Step response
Stability control
Soft approach to seat
Signal generator for frequency
analysis (dynamic tests)
SC cylinder
SC actuators are manufactured
with fabricated steel cylinder
(except for the sizes 63, 100
and 125 which are made of
corrosion resistant aluminum
alloy). They are suitable for service
in harsh environments such as
desert areas, power stations,
petrochemical plants
and steel industries.
Others
AL Lock-up device
AV ¼” and ¾” Volume Booster
CO 3 way pneumatic valves
MC Motion Converter
SL Silencer
SR Quick discharge valve
TP Pressostatic switch
TR Position transmitter
UD Quick Exhaust
GR Manual override
CM series - 7
gfstudio.com
STI S.r.l. (Headquarter)
Via Pascoli 10 a/b
24020 Gorle (BG) Italy
Tel. +39 035 2928.2
Fax +39 035 2928.247
STI S.r.l. (Quarter Turn Division)
Via San Francesco 18
29017 Fiorenzuola d’Arda (PC) Italy
Tel. +39 035 2928.2
Fax +39 0523 1715.295
www.stiactuation.com
Information in this manual is protected by copyright.
All rights are reserved. Information in this document
may be modified at any time without notice.
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