ATTUATORI .
- PNEUMATIC ACTUATORS AND ACCESSORIES -
UsermanING ISSUE .10 March 2004
GT ATTUATORI S.r.l. REA MI 1558400 FAX (02) 90390368
V.le Europa 17 - 20090 Cusago Partita IVA e Cod.Fisc.12449540157 TEL (02) 90390322
Milan - ITALY- E-mail g.trevisan@iol.it
www.gtrevisan.it
PAG. 6 OF 20
INSTALLATION
OPERATION &
MAINTENANCE MANUAL
4.5 - Actuate unit pneumatically several times to ensure that coupling is not binding.
If unit does not function properly, disassemble fixture and actuator coupling, and repeat steps from
4.1 through 4.5.
If problem persist contact your local G.T. Attuatori representative.
4.6 - After all mounting procedures are completed, it is necessary to set travel stops, to ensure proper
rotation.
The
travel stops allow for a range of about 95° to 85°. If a larger range is necessary consult
directly G.T. Attuatori people for information on Extended final limit stops.
NOTE: Improper setting of travel stops can reduce the actuators life.
4.7 - Rotate actuator and valve assembly to desired degree. (it is best to consult valve Installation &
Maintenance sheet to determine the correct set point for the valve).
4.8 - Loosen both sealing nuts. Torque travel stops until they contact the pistons.
Be sure not to alter the valve and actuator position while setting the travel stops.
Torque the sealing nuts until secure.
Retest actuator to assure that there are no end cap air leaks.
FIGURE 3
Top view of a
actuator.
Figure 3 shows an actuator in the
normal position (closed) with the
pinion flats and the indicator-drive
milling perpendicular to the body.
Limit Switches and Positioner
mounting area..
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