DeZURIK
R3 PowerRac
TM
Cylinder Actuator
August 2016
Page 7
D10359
Open and Closed Position Stops
(Continued)
•
With an 8" (200 mm) cylinder, tighten the closed position stop nut (3/4") to 140 ± 18 foot pounds
(190 ± 24 Nm); tighten the open position stop nut (7/8") to 230 ± 30 foot pounds (312 ± 41 Nm).
•
With a 10" (250 mm) cylinder, tighten both stop nuts (7/8") to 230 ± 30 foot pounds (312 ± 41
Nm).
Removing Actuator From Valve
Refer to Figures 1 and 2 for component identification.
1.
Shut down the flow in the pipeline.
Flow in the pipeline with the actuator removed can allow the valve to slam closed
and cause personal injury and/or damage to the flow system. Shut down the flow
in the pipeline before removing the actuator from the valve.
2.
Disconnect and lock out the pneumatic power to the actuator to prevent accidental operation
of the actuator.
Moving parts from unexpected operation of a powered actuator can cause
personal injury or equipment damage. Disconnect and lock out power to the
actuator before servicing.
3.
Disengage the actuator from the valve shaft by loosening the jam nut (B30)
clockwise
and
loosening the adjusting screw (B29)
counterclockwise
.
4.
Remove the four mounting screws (B26) that fasten the actuator to the valve.
5.
Remove the actuator from the valve by lifting the actuator from the valve shaft.
Actuator Disassembly
Refer to Figures 1 and 2 for component identification.
1.
Remove the four pointer screws (B37) and washers (B38); remove the pointer (B9), together
with the other collet assembly components indicated in Figure 1.
2.
Remove the four top cover screws (B15) and washers (B14), and remove the top cover (B11).
3.
Remove the top cover gasket (B13) and the O-Ring (B10).
4.
Remove the gear (B8).
5.
Remove the four end cover screws (B19) and washers (B18), and remove the end cover
(B17) and gasket (B16).
6.
Remove the rack screw (B7) and lockwasher (B6), and separate the rack (B5) from the piston
rod (B42).
7.
Remove the rack bearing (B3).
