Flowserve Valtek VL-ES Actuators Manual de usuario descargar pdf (Pagina 7)

Valtek VL-ES Actuators FCD VLENIM0114-00 – 09/06

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4.10 Lift the cylinder off the yoke and piston. If excessive O-ring resistance is felt, use a rubber mallet

to gently tap around the cylinder perimeter and gently pry the cylinder off with a ﬂat screwdriver.

Remove the piston quad-seal, and two cylinder O-rings.

WARNING: To avoid serious personal injury, never use air pressure to remove the piston. The piston

may ﬂy out of the cylinder.

4.11 Remove the piston assembly.

4.12 Remove the piston stem, piston and piston O-ring from the actuator stem.

4.13 Remove the O-rings seals from the yoke and end cap.

4.14 The bushings in the yoke and end cap can be pushed out with a press if worn or damaged.

5 Assembly of the VL-ES Actuator

The quad seal and all of the O-rings should be replaced and lubricated with a calcium complex grease

(Dow 55 or equivalent). Silicone O-rings must be lubricated with Magnalube-G lubricant or equivalent.

5.1 Inspect the bushing in the yoke and end cap for damage or excessive wear. Use Table II to

determine if the bushings are useable. Excessive wear on these bushings will affect the cycle life of

the actuator. Replace the bushing if necessary.

Table II: Bushing Tolerances

Actuator

Size

Actuator Stem Bushing Piston Stem Bushing

Minimum Maximum Minimum Maximum

in. mm in. mm in. mm in. mm

100 2.252 57.20 2.257 57.33 2.252 57.20 2.257 57.33

200 2.252 57.20 2.257 57.33 2.252 57.20 2.257 57.33

300 2.751 69.88 2.757 70.03 2.751 69.88 2.757 70.03

400 2.751 69.88 2.757 70.03 2.751 69.88 2.757 70.03

5.2 Replacing the yoke and end cap bushings

5.2.1 Remove the old bushings using a press and properly sized pushrods. Take note that the

bushings only push out from one side.

5.2.2 Set the inside bushing by pressing it down to contact the step in the hole. The smaller

bushing is pressed in ﬁrst. Some bushings may be interchangeable.

5.2.3 Set the outside bushing to be ﬂush with the surface. This provides the correct clearance for

the O-ring to be installed later.

5.3 Inspect the piston stem, actuator stem, piston O-ring and piston for damage or wear. Assemble the

piston assembly using Loctite

266 thread locking compound or equivalent. During assembly, a

vice may be used to hold the actuator stem, if desired.

NOTE: When using a vise grip to hold the actuator stem, take care not to damage the stem threads.

5.4 Lubricate and install the four O-rings for the yoke and yoke cap. Lubricate the bushings in the yoke

and yoke cap with a light coat of grease.

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Flowserve Valtek VL-ES Actuators Manual de usuario Pagina 7