Flowserve Valtek VL-C - Page 7

NOTE: When installing the actuator stem, align the actuator stem
flats with the yoke legs. This allows the stem clamp to work
properly and helps prevent plug assembly rotation.
1
CAUTION: When installing the actuator stem lock nut,
do not hold the actuator stem with a pipe wrench as the
sealing surface may be damaged; instead, use a wrench
on the flats of the actuator stem.
5. Reassemble the piston, piston stem O-ring and stem spacer on the
actuator stem according to the proper air-action (see either Figure 1
or 2). Replace the piston quad-seal. Air-to-extend configurations
require the spring button to be stored under actuator stem locknut.
Tighten the locknut firmly by holding the flats on the actuator stem.
NOTE: When reassembling dual or heavy-duty spring actuators, the
spring guide must be first inserted under the actuator stem locknut
(see Figures 3 and 4).
6. For air-to-extend configurations, place the spring under the piston
and insert the actuator stem through the yoke, being careful not to
pinch the actuator stem O-ring or gall the stem and stem bushing.
For air-to-retract configurations, insert the actuator stem through
the yoke and place the spring(s) and spring button above the
piston.
NOTE: Item numbers correspond directly to actuator's bill of material. Refer to it for specific part numbers.
Parts listed indicate differences from the single-spring model.
Figure 3: Dual-spring Cylinder Actuator
Adjusting Screw
(Item No. 210)
Actuator Stem
(Item No. 211)
Spring Button
(Item No. 227)
Inner Spring
(Item No. 230)
Outer Spring
(Item No. 229)
Spring Guide
(Item No. 326)
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Valtek VL-C Spring Cylinder Linear Actuators FCD VLAIM054-01 – 06/13
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