DeZurik LIFT 매뉴얼 - 페이지 5

{카테고리_이름} DeZurik LIFT에 대한 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. DeZurik LIFT 9 페이지. Lift, turn and reseat used on ptw & pfw tapered plug valves

Stop Adjustments

The two stops are spacers and screws located in the actuator cover. When the pointer contacts one of

the stops, the valve quits traveling in that direction. The two stop adjustments are directly related;

changing one stop will change the other stop the same amount. To adjust the stops, follow these steps.

1. Turn the operator on the top of the actuator counterclockwise one revolution. This lifts the plug

off the seat.

2. Loosen -DO NOT REMOVE - the four screws holding the cover dial in place.

3. Turn the operator on the side of the actuator until the pointer pushes against the stop, then

continue turning the operator until the desired stop position is obtained. The pointer should be

either perpendicular or parallel with the pipeline.

Note: If the operator does not turn easily when pushing on the stop, the cover has rusted to the

housing. Use a hammer and chisel to move the cover until the desired stop setting is obtained.

4. Tighten the four screws loosened in Step 2.

5. Check the stop settings by turning the operator on the side of the actuator until the pointer

contacts each stop; ensure the valve plug position is correct at both stop settings.

6. Turn the operator on the top of the actuator clockwise one revolution. This reseats the plug in

the seat.

When a tapered plug valve is 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. Place the plug in the lowest

position before removing the actuator.

1. Discontinue system flow and relieve pipeline pressure.

2. Scribe a line on the valve bonnet and actuator adaptor to use for alignment during actuator

installation.

3. Turn the operator on top of the actuator fully clockwise.

4. Loosen the set screw in the nut on the top of the actuator.

5. Remove the nut, then slide the operator off the sleeve. Do not lose the key.

6. Note the position of the pointer, then remove the screws fastening the pointer in place and lift

the pointer off the actuator.

7. Unscrew the sleeve from the plug stud; this is a left hand thread.

8. Lift the flat bearing washer from actuator.

9. Note the stampings on the top of the valve plug stem. These stampings correspond with the

plug face as shown in Figure 1. It is important that the plug position be noted to ensure it is in

the correct position during ACTUATOR INSTALLATION.

May 2020

LIFT, TURN AND RESEAT G-SERIES ACTUATORS USE ON

Page 5

PTW & PFW TAPERED PLUG VALVES

DeZURIK

D10189