DeZurik G-SERIES Handbuch - Seite 8

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DeZURIK

Cylinder Operated G-Series Actuator

Removing Cylinder

This procedure can be performed with the actuator installed on the valve or removed.

1. Discontinue flow and relieve pipeline pressure.

2. Apply air pressure to the port in the cylinder cap (the end farthest from the actuator housing)

until the valve has moved to the end of its stroke.

Accidental operation of power actuator can cause personal injury or equipment damage.

Disconnect and lock out power to actuator before servicing.

3. Disconnect and lock out the pneumatic power to prevent accidental operation of the actuator.

4. Disconnect the tubing from both cylinder ports.

5. Remove the extension cap from the actuator housing opposite the cylinder.

6. After the extension cap is removed, remove the nuts and spring washers from the end of the

rack rod.

7. Remove the four screws fastening the cylinder assembly to the housing, and carefully remove

the cylinder assembly by sliding it away from the actuator until the rack rod clears the actuator

housing.

8. See Cylinder instructions for details on rebuilding the cylinder.

Installing Cylinder

1. Scrape the old gasket material from the actuator housing and cylinder head, and then place a

new gasket on the cylinder head.

2. Install the cylinder/rack rod assembly by sliding the rack rod through the rack; then fasten the

cylinder to the housing.

Note:

If the rack rod is not attached to the cylinder, clean the threads of both the rack rod and

the cylinder shaft, then apply Loctite to the cylinder shaft threads, and screw the rack rod onto

the cylinder shaft until tight.

3. Slide the spacer, spring washers and nuts onto the rack rod. See Figure 4 for stacking

arrangement of spring washers.

D10191

Figure 4 – Plug Stem Stampings

Page 8

July 2016