Flowserve RG Series Standard Actuator - Manual (Page 5)

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User Instructions RG Series Standard Actuator - AXENIM0122-00 12/09
4.2.1 Apply air pressure to port 2 on FCW (port 4 on FCCW)
actuator, raising pressure slowly, enough to release
spring pressure from the Stop Bolt (17). Back off fully
both Stop Bolts on the Torque Module and release air
pressure. This will relieve the spring preload.
4.2.2 The Spring Module is welded into an integral compo-
nent and cannot be disassembled. To remove from ac-
tuator, remove Spring Module end cover (60) and us-
ing an extended socket spanner /tube spanner, unscrew
and disconnect the Pull Rod (54) from the Torque Mod-
ule.
CAUTION! Take extra care not to drop the socket/small
tools inside the spring can. Small objects dropped in-
side may fall through the spring guide and get stuck
in the spring coils.
NOTE: A retainer ring on the threaded side of the Pull
Rod stops it from being removed completely from the
Spring Module.
4.2.3 Sling the Spring Module using lifting bolts on the Mod-
ule and remove the Adapter Nuts (19) and Lock wash-
ers (20).Spring Module can now be removed from the
Torque Module.
4.2.4 Before reassembling Spring Module to body, make sure
stud threads are clean of any dirt, shavings, or other
debris. Clean threads with rag and solvent if required,
and lubricate threads with an anti-seize compound.
NOTE: Support the Spring Module during removal so
as not to damage the Pull Rod and the studs’ threads.
4.3 Pressure Module
4.3.1 Pressurize rod end of cylinder, enough to stroke to end.
Vent out the air from the cylinder.
4.3.2 Remove end cover plate/plug from pressure module
and unscrew the piston rod with a socket/tube spanner.
4.3.3 Sling the pressure module from the eye bolts, remove
the Adaptor Stud Nuts (19) and Lock washers (20) and
take the Pressure module off the Torque module.
4.3.4 Remove the Tie Rod Nuts (37), the End Plate (33) and
Tie Rods (36).
4.3.5 Slide the Cylinder (34) over and off the Piston (38), be-
ing careful not to scratch or dent the honed and chrome
plated surface of the cylinder.
4.3.6 Slide out the Piston- Piston Rod assembly off the
Adapter Plate (32).
4.3.7 Remove the Retainer Ring (40) and take the Split
Collar (39) off the Piston Rod (35).Pull the Piston
Rod off the Piston.
4.4
Torque Module (Body Group)
NOTE: Spring Module and Pressure Module must
be removed before disassembling the Torque
Module
4.4.1 Remove the Indicator (29), if fitted.
4.4.2 Remove Top Cover Bolts (65) and the cover, O-ring
and the Namur Shaft Assembly (15).
4.4.3 Remove Body Cover Bolts, Lock Washers (26) and
Thread Plugs (31).
4.4.4 Using the removed Body Cover Bolts, jack open the
cover by threading in the bolts in the two tapped
holes until cover is separated enough to pry apart.
Take care to jack the bolts evenly, as the cover is
positioned by four dowel pins, and cross loading
may cause bending/ breakage of pins on small ac-
tuator sizes.
4.4.5 Gently tap with PU/Plastic hammer and pull off the
Guide Bar (2) from the body.
4.4.6 Lift Yoke Sub Assembly out of body bore.
4.4.7 Remove Delrin Plate (7) retaining screws. Pull out
the Yoke Pin (9), and Slider Block (10).
4.4.8 Slide out the Guide Block (11) out of the Yoke and
remove the bottom Slider Block.
4.4.9 Remove Yoke Seals (5) and Yoke Bushing (4) if
worn out/damaged.
4.5 Reassembly Instructions
4.5.1 Inspect all parts for wear and replace any worn
parts as needed. Normally, all O-rings and seals
should be replaced when reassembling an actuator.
Use seal lubricant, Dow Corning 55 for all lubrica-
tion in the pressure group.
Ensure the replacement seals are suitable for the
service temperature.
4.5.2 The Metal backed bronze-ptfe bearings may be in-
spected and assessed for replacement, referring to
guide (see Fig.: 2) on the useful residual life
To replace the bearings, the unit or the subassembly