Manual HD EN
0907e
Modifications reserved. Date 03.2017.
No guarantee for accuracy.
Older data sheets are invalid.
Rotation and stroke adjustment (see the technical data sheet):
For standard actuators AT-HD series (90° rotation), +/-5°stroke adjustment at 0° and 90°.
• Lubrication:
The actuators are factory lubricated for the life of the actuator in normal working conditions. The standard lubricant type GSHD is suitable for use from -40°C (-40°F) to +80°C (+176°F).
For extreme low temperature (L) and high temperature (H) services, special grease is required: please contact AIR TORQUE.
• Construction:
Scotch yoke actuator design suitable for both indoor or outdoor installation.
•
Protection and corrosion resistance:
All the actuators are supplied with a corrosion protection coating as per the data sheet. Other type of coatings are available on customer’s request. Before installing the actuator in
aggressive environment, ensure that the selected protection level is suitable.
•
Actuator designation and marking (see the actuator marking and the technical data sheets):
The actuator type, size, operating pressure, output torque, rotation direction, spring action, operating temperature and type of connections/interfaces are generally established by
designation during ordering phases.
All the AIR TORQUE AT-HD series actuators are marked showing the serial number and all necessary information about use, service and operation.
4.
OPERATING FUNCTION AND DIRECTION OF ROTATION
The AIR TORQUE AT-HD actuators series are pneumatic devices for remote operation of industrial valves. The operation (90° rotation) may be activated by different control system. The
actuator control system can be housed within cabinet and/or on a panel assembled on the actuator or in a remote location.
The standard rotating direction for the AIR TORQUE AT-HD actuators series is clockwise to close (Clockwise to open available on request).
For spring return actuator in case of pressure failure, the following functions are possible: fail open or fail close. Please see the technical data sheets.
5. INSTALLATION
INSTRUCTIONS
The actuator operation allows the opening and the closing of different type of valves. All the necessary technical information to install correctly the actuator onto a valve (i.e.: dimensions,
output torque, supply pressure, air volume, stroke adjustment, operating time, operating temperature, rotation direction and weight) are clearly marked on the actuator data plate and/or
in the catalogue and in the technical data sheets. Please read all technical information before proceeding with the actuator installation.
Important safety notice!
•
For safety reasons, the actuator must not be pressurized during the installation as serious injury may result.
•
Make sure that the pipes, fi ttings and seals connected to the actuator are cleaned to prevent external substances entering into the actuator’s chambers.
•
Make sure that the operating pressure media composition used for the actuator operation meets the operating conditions given in this manual and corresponds to what the actua-
tor was manufactured for.
•
Before fi tting the actuator onto the valve, make sure that the actuator and the valve are correctly oriented, with reference to the rotation direction required.
•
Remove the plugs from the actuator air connections during installation and operation, protect and close the air connections which may not being used immediately.
•
At any time must be avoided that dangerous, corrosive substances and all unnecessary fl uids enter into the actuator pressure chambers by using adequate fi lters.
•
When fi tting accessories onto the actuators, assemble them in such a way that the emergency controls may be easily accessible for emergency manual operation.
•
It is the user responsibility to ensure that Actuator and control components, must be protected from electrical spikes, surge and lightning strikes as well as all magnetic fi elds.
Installation on valves
Before installing the actuator onto the valve, verify that the actuator maximum transmissible torque does not exceed the torque limit according to ISO 5211, in relation to the available ISO
fl ange and the drive shaft connection, considering: the maximum actuator output torque, the maximum air supply pressure and the maximum valve torque.
Before proceeding with the assembly of the actuator onto the valve, make sure that the actuator, when pressurized, operates in the desired rotation direction and that both actuator and
valve are in the correct position.
Important:
When using AT-HD series spring return actuators make sure that the rotation direction is correct for your application when air or electricity failure occurs.
Mount the actuator onto the valve.
The actuator can be assembled onto a valve fl ange in two ways: by the actuator housing threaded holes, or by interposition of a bracket/fl ange. The actuator drive shaft is generally
connected to the valve stem with an insert bushing or with a stem extension (coupling).
The valve and the actuator or bracket fl ange shall be cleaned in order to remove everything that might prevent a perfect adherence between the interfaces (especially all traces of
grease), since the torque is transmitted by friction.
In any cases make sure that all connecting plans are completely adhere to one another and avoid areas of non-contact. For bolts/nuts tightening torque see table 01.
Recommended tightening torque (for screws, nuts etc.) with Rp0.2 > 450 Nmm2 (table 01)
M
M5
M6
M8
M10
M12
M14
M16
M20
M22
M24
M30
M33
M36
Nm
5
9
22
45
76
120
180
350
460
600
1170
1450
1800
6. MAINTENANCE
INSTRUCTIONS
With the information given below, AIR TORQUE provides the end user with all the necessary information for maintenance.
Important:
Before performing any operation on the actuator, shut off the electric/pneumatic/hydraulic supply of the actuator and exhaust the pressure from the actuator cylinder.
Disconnect all electric/pneumatic/hydraulic connections, remove all the accessories and remove the actuator from the valve.
Under normal working conditions, the actuator requires only periodical check to ensure proper operation.
•
Maintenance (disassembly, maintenance and rebuilding) of AIR TORQUE AT-HD series actuators is allowed only to AIR TORQUE personnel or to properly trained personnel. In case of
these conditions will be not respected, the product warranty will expire!
•
Spare parts for maintenance are available (see table 02); the maintenance is required in relation to: environmental conditions, operating conditions and actuator size.
•
After each operation performed on the actuator (including the maintenance), before operating the actuator, make sure that the operating conditions are restored and that the
actuator is properly placed back in service.
•
Remove all piping and accessories if mounted that will interfere with the module(s) that are to be worked on.
•
In case of disassembly, maintenance and rebuilding it is recommended to perform the required operations in a clean area and on a workbench.
HEAVY-DUTY
Scotch-Yoke Pneumatic Actuators
MANUAL
