13
002
M5
3.2
4.3
003
M5
3.2
4.3
006
M5
3.2
4.3
012
M8
13.1
17.7
024
M10
26.2
35.5
036
M10
26.2
35.5
065
M12
45.2
61.3
090
M12
45.2
61.3
180
M16
108.5
147.1
KEYSTONE
FIGURE 79 PNEUMATIC ACTUATOR
OPERATING AND MAINTENANCE INSTRUCTIONS
MAINTENANCE
If basic pneumatic system procedures are
maintained, the Figure 79 actuators will require
minimum maintenance for many thousands of
cycles.
TROUBLESHOOTING
If loss or reduction of power (in output torque)
occurs, take the following steps:-
1. Check air supply.
2. Check for o’ring leakage at the following
‘A’ Top and Bottom Bearing Seals
Apply pressure to PORT A and check with
soap/water solution for leaks at the top and
bottom bearing seals.
‘B’ Endcap Seals
Apply air pressure to PORT B and check
endcap joints for leakage.
‘C’ Piston Seals
Apply air pressure to PORT B and check
PORT A for leakage.
For access to ‘O’-ring seals in order to
replace, refer to Disassembly procedures
for appropriate models i.e. single or double
acting.
Note:
Reduced stroke i.e. valve to which
actuator is fitted not travelling the required
stroke or “backlash” may be caused by an
incorrect fit between output bore and valve
stem.
GENERAL INFORMATION
As standard, clockwise to close rotation, air to
PORT A will rotate the actuator to the OPEN
position. Air to PORT B will rotate the actuator
to the close position.
Warning - for safety reasons
DO NOT
‘Air
Assist’ single acting pneumatic actuators.
RECOMMENDED TIGHTENING TORQUES FOR END CAPS
Torque
Models
Bolt Diameter
(Nm)
(lbs-ft)
STANDARD SPRING COLOR CODES
Spring Rating
Models 003S to 180S
End 1
End 2
40 psi - 2.8 bar
Light Blue
Light Blue
50 psi - 3.5 bar
Light Blue
White
60 psi - 4.2 bar
White
White
70 psi - 4.8 bar
Light Blue/Dark Blue*
White
80 psi - 5.5 bar
Light Blue/Dark Blue*
Light Blue/Dark Blue*
90 psi - 6.2 bar
Light Blue/White*
Light Blue/Dark Blue*
100 psi - 6.9 bar
Light Blue/White*
Light Blue/White*
* Nested (double) springs
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Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Keystone is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
notice.
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