Removing Rotary Actuators From Valtek Valve Bodies; Actuator Disassembly; Disassembling Actuators; Actuator Reassembly - Flowserve Valtek VR User Instructions

 Clean any dirt or other foreign material from the shaft.
 If an air filter is supplied, check and replace cartridge if
necessary.
11. Removing Rotary Actuators from
Valtek Valve Bodies
 Support actuator assembly with lifting straps or eye bolt
before disconnecting it from the body assembly.
 Remove the actuator cover bolts. Carefully pry or slide cover
plate from the lever arm.
 Loosen the clamp bolt on splined lever arm.
 Remove the actuator from the body by separating the actuator
at the yoke. This is done by removing the four transfer case
bolts and pulling the actuator off the valve shaft.

12. Actuator Disassembly

12.1 Disassembling Actuators

If it is necessary to disassemble an actuator, refer to Figure 2 and
proceed as follows:

Depressurize actuator and disconnect all tubing.
Spring is under compression. Failure to
relieve spring compression by removing
adjusting screw can result in serious personnel injury.
 Relieve the spring compression by removing the adjusting
screw.
 Insert flat screwdriver in partially exposed slot near the end
of the retaining ring.
Do not use air pressure to remove
cylinder. It will result in personnel
injury.
Substantial O-ring resistance may be felt.
 Pull the cylinder off the transfer case and piston.
VLAIM031-14 (EN/AQ) May 2023
Valtek VR Spring Cylinder Rotary Actuators
 Remove spring button and spring.
Care must be taken not to damage the
sliding seal assembly or actuator stem
O-ring when removing the actuator stem.
 Remove the actuator stem locknut. The piston and piston
stem O-ring may now be removed from the actuator stem.
 Remove the spiral snap-ring holding the sliding seal
assembly in place.
 Remove the retaining washer and sliding seal collar. These
components can usually be removed by hand or by gently
prying the outside surface of the collar upward.
Do not scratch the bottom surface of the
sliding seal collar with a screwdriver
else sharp object. Scratches will cause excessive wear and
leakage.
 Remove the transfer case cover plate by removing the four
bolts.
 Remove the yoke from the transfer case by removing the four
lug bolts.
 Remove the pivot pin from the splined lever arm by
removing a retaining ring.
 The actuator stem can be removed from the transfer case.
 The splined lever arm can be removed after removing the
positioner according to the appropriate positioner
maintenance bulletin.
 If the yoke/cover plate bearings need to be replaced,
press them out of the yoke and/or cover plate using a press
and arbor.
 The splined lever arm bearings can be replaced by pressing
them out with a press and arbor.

13. Actuator Reassembly

13.1 Reassembling Actuators

To reassemble an actuator, refer to Figure 2 and proceed as
follows:
 Clean and lubricate all internal parts. All O-rings should be
replaced and lubricated using a silicone lubricant (Dow
Corning 55M or equivalent). The bore that houses the sliding
seal assembly in the transfer case must be smooth and clean.
 If splined lever arm bearings were removed, install new
bearings by pressing them into place with a press and arbor.
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