Flowserve F39 Series Pneumatic Actuator - Manual (Page 13)

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Series F39 Pneumatic Actuator - WCENIM2036-00 05/15
Sizes 10–35 Rev. R2 through R7 and Sizes 40 and 42 Rev. R 2
70 psi - 8 springs - 4 per end cap. Remove center spring.
60 psi - 8 springs - 4 per end cap. Remove center spring.
50 psi - 6 springs - 3 per end cap. Use three on a diagonal.
40 psi - 4 springs - 2 per end cap. Use two in opposite corners.
Sizes 10–50 Rev. R2 (Except Size 40 and 42)
70 psi - 20 springs - 10 per end cap.
Remove required number of
springs starting in the center.
Remaining springs should be
evenly spaced as possible.
60 psi - 20 springs - 10 per end cap.
50 psi - 16 springs - 8 per end cap.
40 psi - 12 springs - 6 per end cap.
The size 05 spring-return actuator operating at 80 psi has four springs
(two per end cap). For air supplies of 70, 60 or 50, remove inner spring
of each end cap.
Ordering Code 4 5 6 7 ( )
Supply Pressure (psi) 40 50 60 70 80
Actuator Size and
Current Rev.
End of Spring Torque (in Lbs)
10 R7 42 63 84 84 104
15 R7 74 112 149 149 186
20 R7 135 212 272 272 339
25 R7 232 348 465 465 581
30 R7 372 558 744 744 929
33 R7 804 1204 1611 1611 2009
35 R7 929 1398 1859 1859 2328
40 R7 1496 2239 2982 2982 3735
42 R7 2593 3885 5177 5177 6469
45 R2 4735 6319 7849 7849 9478
50 R2 7319 9762 12204 12204 14638
Ordering Code 1 1 1 ( )
Supply Pressure (psi) 50 60 70 80
05 32 32 32 41
13 SPRING-RETURN ACTUATOR
13.1 When replacing springs in a spring-return actuator,
ensure that the springs are replaced in their identical
position in the end cap from where they were removed.
IMPORTANT: When less than the standard number of
springs are used in each end cap, these springs should
be positioned according to the air supply figures below.
The values listed below are for standard and less than the
standard air pressure as required per the ordering code.
NOTE: Maximum operating pressure does not change.
13.2 If a spring-return actuator is being repaired due to a failed
spring, REPLACE all the springs in this actuator, as well
as any other parts which may have been damaged.
13.3 When replacing the springs in a spring-return actuator,
place the springs in the end cap pocket after thoroughly
lubricating each spring. Be generous with lubricant!
13.4 With the springs pointing up and the end cap on a solid
surface, place the actuator body over the springs and the
proper end cap. (Each end cap can only be mounted to
just one end of the actuator body, as there is a “foolproof”
pin in the end cap, which aligns with a hole in the body.)
13.5 Force the body down and begin by engaging two end cap
screws (5C) by hand through the end cap. Take each end
cap screw up in SMALL and EQUAL turns. Once the end
cap is temporarily secured to the body, turn the actuator
over to its normal position and uniformly take up the four
end cap screws. Uniformly load all the springs to prevent
any spring from buckling.
IMPORTANT: Locating nibs are cast into the Rev. R2 (all
sizes) and the Rev. R3 through R7 (sizes 25 through 42)
actuator piston face. The actuator springs must fit over
these locating nibs on the piston face. Care in following
the above instructions will ensure the proper alignment of
the spring in the actuator body — proper contact with the
piston face and end cap.
13.6 In a similar manner, as written in the previous steps,
replace the springs in the other end of the actuator body.
13.7 On sizes 40 to 50 Rev. R7 only encapsulated springs (pre
compressed) can be used with this design.