User Manual

5
All information herein is proprietary and condential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc.
The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Series 92-93 Pneumatic Actuator
Operations and Maintenance Instructions
Some valves or operating conditions require that
the actuator have more that 5° of travel adjustment.
For these conditions, the Series 92/93 actuator can
be tted with extended travel stops in the end caps.
(See Pg. 10 for instructions on nding dimensional
data) Consult the Flow-Tek distributor in your area
for this option.
Spring return actuators may be operated with only
one air supply connected to Port A, since the spring
cartridges will move the pistons when the air pres-
sure in removed. This operation, however, will
draw the surrounding atmosphere into the spring
chambers through Port B.
NOTICE
To prevent contamination from entering the spring
chamber, actuators congured to operate with
only one air supply connected to Port A should be
equipped with a 40 micron (or ner) lter element
installed in Port B.
Even better service may be obtained on spring return
actuators by installing a four-way solenoid, cover-
ing both Port A and Port B. A four-way solenoid
will ll the spring chambers with compressed air
from the plant air supply with each stroke. The
plant air supply is often cleaner than the surround-
ing atmosphere, especially in heavy industrial or
chemical areas.
Maintenance
The rugged components and factory lubrication
combine to ensure a long and trouble-free service
life for Series 92/93 actuators. Dirt, rust and water
are the most common causes for shortened service
life, and they typically enter the actuator through
the air supply line.
NOTICE
To lengthen service life, it is strongly recommended
that an adequately sized lter with a 40 micron
(or ne) element be installed adjacent to the inlet
of the directional control (solenoid air) valve. Air
lubricators are recommended for rapid cycling
applications (10 cycles or more per minute.)
Routine maintenance of Series 92/93 actuators
consists primarily of maintaining the air supply
system by changing lter elements before they
start by-passing, adding oil to lubricators before
they run dry, and preventing water from entering
the air lines.
The second most common cause of shortened service
life is misalignment between the valve and the actua-
tor. This can cause premature failure due to excessive
side loads on the bearings and gear teeth.
NOTICE
To lengthen service life, the mechanical connec-
tion between the actuator and the valve should be
veried to be properly aligned and free to rotate
throughout the full range of valve travel.