Flowserve Factory Mutual Approved Oil or Gas Safety Shutoff Valve - Manual (Page 9)

WCAIM2054 Factory Mutual Approved Oil or Gas Safety Shutoff Valves 9
h. All rebuilding kit O-rings and bearings may now be
installed, if all the actuator surfaces are clean and free of
grit and scratches. If the inside walls of the body are
scored, or the guide rod surfaces are scratched, the
actuator will leak after rebuilding. New unscored parts
should be obtained from the factory. Light tracking, barely
detectable to touch, is acceptable.
i. Lubricate the actuator thoroughly with a #1 grease. Apply
a light film of grease to all O-rings.
2. Actuator Reassembly
a. Some Rev. R2 actuators, sizes 10–35, use different
bearings in the end caps. They resemble a “top hat”, and
are installed with the brim of the hat facing out.
These bearings are retained by “star washers” (16). These
bearings and star washers should not be removed for
O-ring seal replacement. On sizes 10 and 15 only, there is
one star washer, or retainer, per bearing. On sizes 20–35,
there are two star washers per bearing. They are installed
one on top of the other, with the “points” of the “star”
overlapping each other (as opposed to being on top of
each other). All the washers must be pressed in firmly
and straight. The points of the star are bent slightly. When
installed, they bear back, away from the hole.
For sizes 10–40 Rev. R1 and 10–42 Rev. R3 through R6
actuators, replace the two split-ring style bearings (6A)
and one guide rod O-ring (15B) in each end cap.
Replace the split-ring style bearing (6B) and guide rod
O-ring(s) (15B) into I.D. groove(s) in each piston. Install
O-rings (15C) onto pistons.
Replace O-ring (15E) and bearing (15H) (10–42 sizes
only) on the bottom of shaft. On the top of the shaft add
the two stainless steel washers (10–35 sizes only) with
the thrust bearing (10) between them.
NOTE: For sizes 40 and 42 Rev. R3 through R6, only a
single stainless steel washer is used and the thrust
bearing (10) is not used. Locate the top bearing (15G)
and O-ring (15D) into the body. Replace the shaft through
the larger opening in the bottom of the body.
For sizes 10-35 Rev. R6 actuators, top bearing (15G) is
flat, the same as and interchangeable with thrust bearing
(10).
For Rev. 3 through R6, sizes 25–42 actuators, replace
anti-ejection ring (15J) in its groove on the shaft (2B), if
removed.
For Rev. R1 models, locate the shaft O-rings into the
actuator body. O-ring (15D) is the top O-ring while (15-E)
is the bottom O-ring.
Replace the top bearing (15G) and bottom bearing (15H).
Replace the shaft in the body through the bottom of the
actuator body.
Replace the anti-ejection ring (15J) in its groove in the
shaft (2B), if removed. Check that the ring is properly
seated in its groove.
b. Very carefully align the piston guide rod assemblies inside
the body. Keep the pistons square to the body. (This is
very important in the 30 39 actuator where steel set
screws can cause internal body damage if the piston
assemblies “cock” inside the actuator body.)
IMPORTANT: One piston guide rod assembly has a through
hole drilled in it. It can be easily located by looking down
the ends of both guide rods. This piston assembly must be
reassembled, with its respective guide rod, opposite the
nameplate on the body, as it was removed.
c. Align the shaft so that the teeth on the shaft will “pick up”
the piston assembly’s rack teeth when turning the top
extension of the shaft clockwise (CW). (See Figure 1.)
IMPORTANT: Proper 90° rotation can only be ensured if
the shaft teeth begin to mesh with the piston assembly’s
teeth at the “proper tooth” between these meshing gear
pairs. (See Figure 1.)
Flow Control Division
Worcester Controls
Figure 1 Figure 2
IMPORTANT: Note the relative location of the shaft teeth and the
piston assembly’s rack teeth. The above figure is viewed when
looking at the top of the actuator.
IMPORTANT: Align gear teeth on the shaft per Figure 1.