DeZurik G16 Instrukcja - Strona 13

Przeglądaj online lub pobierz pdf Instrukcja dla Kontroler DeZurik G16. DeZurik G16 19 stron. Cylinder operated actuator used on pec eccentric valves

Disassembling Actuator

When eccentric valves are mounted in a vertical pipeline, or mounted in a horizontal pipeline with the

plug stem horizontal, gravity can cause the plug to swing to a lower position in the valve body when the

actuator is removed. To avoid this problem, place the plug in the lowest position before removing the

actuator.

1. Discontinue flow and relieve pipeline pressure.

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

Disconnect and lock out power to actuator before servicing.

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

Disconnect the tubing from the cylinder.

3. Remove the extension cap from the actuator housing. On units with booster cylinders, carefully

remove the booster cylinder or cylinders.

4. Place the actuator in the open position, then shut off cylinder supply pressure and disconnect

the tubing.

5. Remove the nuts and washers from the end of the rack rod.

6. Remove the screws or nuts 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.

7. If the valve is 4–20" (100–500mm):

a. Remove lock nut, spring washers, wrenching nut & pointer from the plug stud.

b. Proceed to step 9.

8. If the valve is 24–36" (600–900mm):

a. Loosen lockscrews #1 about 6 to 8 turns and loosen lockscrews #2 about 3 turns. See

Figure 4.

b. Using a soft hammer, tap the heads of the #1 lockscrews to loosen the keys.

9. Remove the four screws holding the wrenching nut to the gear sector, then remove the stud

locknut, spring washers and the wrenching nut with the keys attached.

10. Scribe corresponding lines on the actuator cover

and housing, then remove the cover screws and

cover from the top of the actuator.

11. Mark the teeth of the rack and gear as shown in

Figure 6 and lift the gear sector out of the actuator.

12. Remove the rack from the housing.

August 2012

Cylinder Operated G-Series Actuator

Page 13

DeZURIK

Figure 6 – Scribe Marks

D10022