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DeZURIK

ANSI/AWWA C540 Pneumatic Cylinder for G-Series Actuators

Reassembly

(continued)

2. Attach the cylinder head to the actuator. See Figure 2.

3. Carefully install the rack rod and piston rod.

4. Eccentric valves: Install the spacer, spring washers and nuts on the rack rod. See Table B for

spring washer arrangement.

All other valves: Install the jam nuts on the rack rod.

5. Eccentric valves: Tighten the nut until the spring washers are completely compressed, and

then back off until they return to their normal uncompressed shape.

All other valves: Tighten the first nut.

6. Tighten the second nut.

7. Install the extension cap.

8. Put the piston on the piston rod and install the nut.

9. Remove the piston seal and its O-ring. Clean the O-ring, seal and groove. Lubricate the O-ring

and seal and replace. Use new O-ring and seal if necessary.

10. Lubricate the cylinder tube.

11. Carefully slide the cylinder over the piston. The seal and the cylinder must be well lubricated.

12. On 6-inch and larger cylinders, remove one or two of the tie rods.

D10295

Figure 2—Cylinder Parts Location

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March 2017