Flowserve 10 ACCESS I 39 Actuators - Manual (Page 13)

WCAIM2027 10, 15, 20 ACCESS I 39 Actuators 13
Flow Control Division
Worcester Controls
SPRING-RETURN ACTUATOR
1. 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.
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 that may have been damaged.
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!
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 “fool-proof” pin in the end cap that aligns with
a hole in the body.
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.
6. In a similar manner, as in the previous steps, replace the springs
in the other end of the actuator body.
Ordering Code 4 5 6 7 ( )
Supply Pressure (psi) 40 50 60 70 80
Actuator Size End of Spring Torque (In.-Lbs.)
10 35 55 75 75 95
15 65 105 145 145 185
20 125 195 265 265 335
Sizes 10–20
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 3 on a diagonal.
40 psi - 4 springs - 2 per end cap. Use 2 in opposite corners.