Flowserve RG Series Standard Actuator Jackscrew Override - Manual (Page 4)

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User Instructions RG Series Standard Actuator - AXENIM0123-00 12/09
2 Heavy Duty Jackscrew Overrides
Jackscrew overrides on Automax heavy duty actuators pro-
vide economical, durable method for manually operating the
actuator. The jackscrews are either direct operating or bevel
gearbox driven, to reduce operation effort. The direct opera-
tion consists of a rotating screw, threading into the nut which
is fitted on the Torque module/ Spring module, and the hand
wheel directly turns the screw.
The bevel gearbox driven jackscrew, has an arrangement of
rotating nut and a rising screw. The higher thrust require-
ments for models bigger than 4000 Nm and for the stiffer
springs are met with this type of jackscrew design.
Jackscrews are available on models RG1 through RG5.
2.1 Installation
Automax standard jackscrew overrides are provided as a com-
plete integral component of the heavy duty actuator. Override
units are shipped with the jackscrew assembly mounted to
the actuator and vent valves installed on the pressure mod-
ule. No additional customer installation is required. Refer Au-
tomax Heavy Duty IOM (FCD AXENIM0121) for instructions
on installing Heavy Duty actuator into service.
2.2 Install jackscrew override onto heavy duty DA
actuator (see Fig.: 1)
2.2.1 Disconnect air pressure and electrical power from ac-
tuator.
2.2.2 Remove the DA end cover plate.
2.2.3 Back off the jackscrew fully in the assembly and
mount the jackscrew assembly on the torque module
end flange, locating the spigot in the Torque module.
2.2.4 Use the jackscrew mounting kit and the O-ring from
the DA cover.
2.2.5 Tighten the mounting stud nuts fully, with lock wash-
ers from the kit.
2.2.6 Fix the 3 way vent valves supplied in the kit, to both
ports of the pressure module and connect air supply
pressure lines to these valves.
2.2.7 Installation of pressure module side jackscrew re-
quires replacement of std end plate of the pressure
module. Remove tie rod nuts and end plate, and fit in
the jackscrew assembly, supplied preassembled with
the suitable thrust base End Plate. Tighten the tie rod
nuts back on the pressure module. Fix the 3way valve
on the ports.
2.3 Install jackscrew override onto existing heavy
duty SR actuator (see Fig.: 2)
2.3.1 Disconnect air pressure and electrical power from ac-
tuator.
2.3.2 Remove the end cover plate on the Spring module, re-
taining the cover O-ring.
2.3.3 Tighten the mounting studs from the mounting kit with
thread lock compound into the spring module end
plate.
2.3.4 Back off the jackscrew fully in the assembly and mount
the jackscrew assembly on the spring module end
plate’s thrust base, locating the spigot in the spring
module end plate.
Fig.: 1 Install Jackscrew Override (DA)