Flowserve Valtek VL-C Spring Cylinder Linear Actuators - Manual (Page 5)

54-5 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
entire cylinder bore, end cap and both sides of the
piston enables smooth operation and can help
reduce corrosion.
3. Lubricate the outside of the replacement bushing if
the stem bushing has been removed. Press a new
lower stem bushing into the actuator stem bore in
the yoke until it bottoms out. Press the upper stem
bushing into the bore until it is flush with the top of
the yoke (refer to Figures 1 or 2).
4. Replace the actuator stem O-ring and yoke O-ring.
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.
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
Figure 3: Dual-spring Cylinder Actuator
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.
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)